最新刊期
卷 46 ， 期 1 ， 2025
- “在全彩广色域显示领域，研究人员通过配体辅助再沉积技术，成功合成了具有高稳定性和高PLQY的MAPbBr3钙钛矿量子点，为显示器件发光二极管色转换层提供了新方案。”摘要：Quantum dots （QDs） exhibit excellent optical properties with their size tunability， excellent photoluminescence quantum yield （PLQY）， and broad spectral absorption， making them an ideal material choice for full-color， wide-gamut LED color conversion layers. In particular， MAPbBr3 quantum dots （PQDs） are not only easy to prepare， but also possess excellent photovoltaic properties， and thus are considered to be a material with great potential for commercialization. However， the ligands on the surface of MAPbBr3 PQDs are highly susceptible to detachment after their synthesis， leading to an increase in the density of surface defect states， which makes them less stable under environmental factors such as water-oxygen and temperature， thus further degrading the PLQY. In this study， we propose an efficient one-step strategy for the synthesis of MAPbBr3 PQDs∶MAPbBr3 PQDs with excellent stability and high PLQY， which were successfully synthesized by ligand-assisted redeposition and the innovative use of 2-hexyldecanoic acid （DA） ligand to replace the conventional oleic acid （OA） ligand at room temperature， and the double-short-chain DA ligand was able to establish a stronger coordination bond with the MAPbBr3 PQDs compared with that of the single-length carbon chain OA ligand. The strong interactions between the ligands and the PQDs contribute to the overall passivation of the lattice defects， thus mitigating the non-radiative recombination process and enhancing the environmental stability. As a result， the modified MAPbBr3 PQDs not only exhibited up to 87.8% PLQY， but also showed higher stability in both water and oxygen environments. The PL peak of MAPbBr3 PQDs modified with DA ligands remained at 68.3% of its original value after being left for half a month in a room temperature environment， whereas OA ligand-modified PQDs exhibited almost complete fluorescence burst. Subsequently， the DA ligand-modified green MAPbBr3 PQDs， red CsPbBrI2 PQDs， and blue CsPbCl1.5Br1.5 PQDs were coated and cured in a polystyrene （PS） environment to form a film， which can be used as a color conversion material instead of the traditional phosphors for the backlight of light-emitting diode （LED） displays. The color gamut is 137.09% under NTSC standard.关键词：MAPbBr3 PQDs;DA ligands;stability;wide color gamut;LED displays370|100|0更新时间：2025-02-20
Cover Story
- “Technology media journalists report: Researchers have made significant progress in the field of on-chip ZnO lasing applications. They fabricated a circular ZnO microdisk on a Si substrate, which exhibits a unique toroid structure and supports optically pumped WGMs lasing in the ultraviolet region with a high Q factor. The cavity quality is high enough to support the BGR phenomenon, and the lasing spectrum can be modulated with increasing pumping power.”摘要：Although it has a significant advantage in gain properties， the lack of selective etching processes hinders ZnO lasing in on-chip applications. Herein， the circular ZnO microdisk pivoted on Si substrate is fabricated through depositing ZnO on patterned silicon on an insulator （SOI） substrate. The cavity structure， morphology， and photoluminescence （PL） properties are studied systematically. The cavity shows a well-defined circular structure with oxygen vacancies. Under the synergistic action of surface tension and stress， the ZnO microdisk shows a unique toroid structure with a high sidewall surface finish. The ZnO microcavity （8 μm in diameter） shows optically pumped whispering gallery modes （WGMs） lasing in the ultraviolet region with a Q factor exceeding 1 300. More interestingly， the quality of the toroid ZnO microdisk cavity is high enough to support the bandgap renormalization （BGR） phenomenon. With the increasing pumping power， the lasing spectra will be modulated. The lasing spectrum undergoes a Burstein-Moss （BM） effect-induced blueshift and an electron-hole plasma （EHP） effect-induced redshift.关键词：ZnO;Microdisk;Tunable lasing;Molecular Beam Epitaxy211|71|0更新时间：2025-02-20
Editor's Choice
- “光学微腔技术在荧光和拉曼光谱增强领域取得突破，为痕量物质检测提供新方案。”摘要：Optical microcavities highly confine optical fields in microscales to boost the interaction strength between photons and matters， which can be used as a general structure for enhancement of florescence and Raman scattering in applications of trace-detection and optoelectronics. The development of nanomanufacturing techniques advances optical microcavities to higher quality factors and smaller mode volumes， by which several new physical phenomena in radiation and scattering processes are observed. Unfortunately， the performance of optical microcavities in fluorescence and Raman enhancement competitive to surface plasmonic resonances supported by metallic nanostructures is still challenging. The hybrid structures integrating optical microcavities with metals or 2D materials are therefore proposed， opens up new opportunities to boost the microcavity-enhanced radiation and inelastic scattering superior to traditional surface-enhanced fluorescence and surface-enhanced Raman spectroscopy in a variety of applications. This article reviews the advancements in optical microcavity enhanced fluorescence and Raman spectroscopies over past two decades. It provides a comprehensive overview of the types and optical properties of optical microcavities， and deeply explores the enhancement mechanisms in the cutting-edge of the related studies. Finally， the prospects of optical microcavity enhanced fluorescence and Raman spectroscopy in development and future applications are summarized.关键词：optical microcavity;fluorescence spectroscopy;Raman spectroscopy;Surface-enhanced fluorescence;Surface-enhanced Raman Spectroscopy399|235|0更新时间：2025-02-20
- “荧光寿命成像技术在生物医学领域应用广泛，专家综述了其在生物学研究和临床医学研究的进展，展望了未来发展趋势。”摘要：Fluorescence lifetime imaging is a technique widely used in various fields. It has high sensitivity， high time resolution and spatial resolution. Moreover， it also can be used to quantitatively study the sample without the influence of excited laser and environmental factors. Because of the above advantages， fluorescence lifetime imaging had been widely used in biomedical field. Fluorescence lifetime imaging technique can be divided into frequency domain and time domain routines. Frequency domain routine can be divided into heterodyne method and homodyne method according to the difference frequency characteristics. There are three major methods to realize time-domain routine， i.e. gating method， time-correlated single photon counting method （TCSPC） and scanning camera measurement method. This work introduces the basic principles of aforementioned fluorescence lifetime imaging methods. We then review the recent application of fluorescence lifetime imaging in biological sciences and the clinic study of tumor cancer cell， and further give its perspectives.关键词：Fluorescence lifetime imaging technology;Frequency domain method;Time domain method;Biomedical science198|191|0更新时间：2025-02-20
Invited Review
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Preparation and Performance of Pr3+ Doped Ge-As-Ga-Se Chalcogenide Glass and Optical Fiber 增强出版 AI导读
“最新研究报道，科研团队成功制备出高浓度Pr3+离子掺杂的Ge12As20.8Ga4Se63.2玻璃光纤，具有低损耗和强荧光发射特性，有望成为4 µm波段光纤激光器增益介质。”摘要：A 0.2%（mass fraction） high concentration Pr3+ ion doped Ge12As20.8Ga4Se63.2 chalcogenide glass was prepared for gain fibers used in 4 µm wavelength fiber lasers， and a single-mode double cladding gain fiber was fabricated using rod-in-tube technology. The optical properties of the glass and fiber prepared under different processes were compared and analyzed by using X-ray diffraction， differential scanning calorimetry， electron probe element analysis， ellipsometer， infrared thermal imager， infrared microscopy， infrared Fourier transform spectrometer， fluorescence spectrometer， and other methods. The substrate loss of the final prepared optical fiber is about 2.65 dB/m， and strong fluorescence emission at 3.8-4.8 µm was successfully detected. This chalcogenide glass fiber has relatively high Pr3+ solubility， good thermal stability and emission property， which has the potential to serve as a gain medium for 4 µm band fiber lasers.关键词：Chalcogenide glass;rare earth doping;Purification method;Mid infrared fluorescence;Mid infrared fiber laser169|47|0更新时间：2025-02-20 - “在钙钛矿薄膜制备领域，研究人员通过调节乙酸乙酯和正己烷混合比例，成功控制晶体成核和生长过程，制备出性能优异的钙钛矿薄膜。”摘要：Ethyl acetate（EA） is commonly used as a green anti-solvent for the preparation of perovskite films. However， its high polarity leads to an excessively fast extraction rate， which complicates the control of the nucleation and crystallization processes. In this study， we adjusted the anti-solvent extraction rate by adding n-hexane（Hex） to EA， which allowed to control the solution’s supersaturation and achieve a dynamic equilibrium in the nucleation and growth processes of the crystals. Additionally， molecular dynamics simulation of the solvent and anti-solvent system was carried out using Materials Studio software， and the interaction energy of the solvent and anti-solvent system was quantitatively calculated. The experimental results show that the average grain size of the perovskite film prepared by 60% N-Hex（i.e.， 60% molar percentage of Hex in the anti-solvent） is 249 nm， which is 17% and 71% larger than films prepared with pure EA and pure Hex， respectively. The carrier lifetime was 225 ns， which is 27% and 45% longer than that of films made with pure EA and pure Hex， respectively. Furthermore， the crystal plane of this thin film （110） is the dominant crystal plane. The molecular dynamics calculations of this experiment suggest that the best perovskite film was obtained when the solvent and anti-solvent interaction energy is 1 385 kJ/mol.关键词：perovskite;green;anti-solvent engineering;molecular dynamics176|171|0更新时间：2025-02-20
- “在材料科学领域，研究人员采用尿素辅助共沉淀法制备了ZrO2∶Yb3+/Er3+材料，并通过X射线衍射技术探究了Yb3+/Er3+掺杂对ZrO2晶体结构的影响，发现掺杂导致ZrO2晶体结构转变。同时，研究了ZrO2∶Yb3+/Er3+的发光热稳定性及温度传感特性，实现了基于多荧光强度比信号的温度传感，提高了测温准确性。”摘要：ZrO2∶Yb3+/Er3+ samples were prepared by urea-assisted coprecipitation. The effect of Yb3+/Er3+ doping on the crystal structure of ZrO2 was investigated by X-ray diffraction technique. The experimental results investigate that the doping of Yb3+ and Er3+ ions leads to the phase transformation of ZrO2 from monoclinic to tetragonal and cubic. The luminescent thermal stability of ZrO2∶Yb3+/Er3+ and the temperature sensing characteristics based on thermal coupling energy levels were investigated by temperature-dependent upconversion spectra. ZrO2∶Yb3+/Er3+ shows an upconversion luminescence without thermal quenching characteristics under the excitation of 980 nm laser. Based on the thermal coupling characteristics between green-emitted 2H11/2 and 4S3/2， green-emitted Stark levels 4S3/2（1） and 4S3/2（2） and red-emitted Stark levels 4F9/2（1） and 4F9/2（2）， the temperature sensing with four fluorescence intensity ratio signals responding at the same time is realized. Compared with the temperature sensor with a single fluorescence intensity ratio signal， the temperature measurement with multiple signals responding at the same time can further avoid the interference of accidental factors in the temperature measurement process and improve the accuracy of temperature measurement.关键词：thermal coupling levels;temperature sensing;non-thermal;the phase transformation135|34|0更新时间：2025-02-20
- “最新研究发现，稀土掺杂上转换纳米材料通过添加单壁碳纳米管、贵金属和光子晶体，可显著提升光热性能和测温灵敏度，为光热传感器性能提升提供新策略。”摘要：Rare earth-doped upconversion nanomaterials have wide application prospects in photothermal sensing， biomedicine and so on， but it has poor thermal conductivity， low temperature measurement sensitivity and upconversion luminescence （UCL） intensity. It’s an effective way to improve their UCL intensity and photothermal performance by assembling composite films which contain single-walled carbon nanotubes （SWCNT）， noble metal and photonic crystals （PCs）. In this work， NaGdF4∶Er3+/Yb3+/Al3+ nanocrystalls （UCNPs） were synthesized by the solvothermal method. The photothermal performance of upconversion layer （UC）， SWCNT/UC， Ag/SWCNT/UC and PCs/Ag/SWCNT/UC were compared， and the effects of different film layers on the photothermal performance of UCNPs were studied. The results indicate that PCs/Ag/SWCNT/UC has the best performance， and compared with the UC film， the enhancement factors of red and green emission intensities are 3.48 and 4.24 times， respectively. Its photothermal conversion efficiency is 33.79%， which is 1.49 times of UC’s. The absolute sensitivity （SA） of the optical temperature measurement is obtained as 3.14×10-3 K-1 at 353 K and the relative sensitivity （SR） is obtained as 1.87×10-2 K-1 at 273 K. The work provides an effective way to improve the performance of the photothermal sensor.关键词：Composite films;NaGdF4∶Er3+/Yb3+/Al3+ nanocrystalls;Photothermal performance;Temperature measurement sensitivity164|37|0更新时间：2025-02-20
Synthesis and Properties of Materials
- “钙钛矿太阳能电池技术快速发展，光电转化率显著提升，但大面积制备仍面临挑战。”摘要：The abundant raw materials， low cost， high performance， and flexibility of perovskite materials have sparked significant research and industrial interest. Following this， perovskite solar cells （PSCs） have undergone rapid development at the laboratory scale， the photovoltaic conversion efficiency has been improved from the initial 3.8% to 26.7% in just a few decades. Its excellent photoelectric performance is due to the physical properties of perovskite materials， such as wide light absorption range， good temperature coefficient， adjustable band gap， high carrier mobility and strong defect tolerance. The commercialization of perovskite photovoltaics depends on the successful transition from laboratory-scale perovskite solar cells to large-scale perovskite solar modules. However， as the device size increases， the efficiency drops significantly， hindering its commercial viability. The main problem lies in the preparation of high-quality and highly uniform large-area perovskite films， which are mainly prepared by spin-coating for small-area devices. However， the spin-coating method is not suitable for large-area film preparation as it can lead to uneven film thickness and severe waste of raw materials. Researchers have employed techniques such as blade coating， slot-die coating， inkjet printing， and vacuum deposition， etc. This article reviews the preparation process of large-area perovskite thin-film and the current research progress at home and abroad， and discusses the improvement of device efficiency by various additives and solvents， with the hope of realizing the industrialization and commercialization of large-area perovskite photovoltaics as soon as possible.关键词：perovskite;Large area module;solar cells;Preparation process;Solar power318|151|0更新时间：2025-02-20
- 摘要：A set of self-similar mode-locked ultrashort pulse fiber lasers and erbium-doped fiber amplifiers were designed and constructed. In the seed source part， the self-made carbon nanotube saturable absorber combined with dispersion management was used to control the net dispersion in the cavity to produce a self-similar parabolic pulse for micro-positive dispersion， which was used as the seed source for subsequent power amplification and spectral broadening. The amplification stage adopts a bidirectional pumping method， and the signal light is fully gained through the high-gain and low-dispersion Er-doped fiber. The output power is 39.51 mW， the spectral width is 38.11 nm， and the amplification gain is 20.65 dB laser output. Finally， the amplified self-similar mode-locked pulse is compressed by ordinary single-mode fiber， and the ultrashort pulse laser output with a compressed pulse width of 283 fs is obtained.关键词：fiber laser;ultrashort pulse;self-similar pulse amplification82|97|0更新时间：2025-02-20
Device Fabrication and Physics
- “在微纳光电探测器领域，研究人员提出了一种基于Au光栅/石墨烯/h-BN/SiO2的异质结构，利用声子极化激元效应增强石墨烯光电性能，为中红外光电探测器提供理论依据。”摘要：Since its successful preparation， graphene has attracted wide attention in many fields for its excellent material properties. In particular， it has the characteristics of fast photoelectric response， wide spectrum absorption characteristics， size advantages， etc.， making it one of the ideal materials for preparing micro-nano photo-detectors. At present， graphene photo-detectors have been realized， but graphene detectors based on traditional structures have problems of low light absorption efficiency and poor photoelectric response. Using plasmons to achieve light absorption enhancement is a feasible technical route， but it has problems such as overly complex micro-nano structures， high costs， and insufficient performance. This paper proposes a heterostructure based on Au grating/graphene/h-BN/SiO2， which uses the phonon polariton effect generated by the interaction between h-BN and infrared light to localize infrared light in graphene and enhance the overall absorption rate of graphene and heterostructure. At the same time， the lattice constants of graphene and h-BN are similar， and this heterostructure can maximize the excellent photoelectric properties of graphene. The absorptivity and electromagnetic field distribution were analyzed by the finite element method （FEM）. It was found that when the incident light frequency was 1 550 cm-1， the power dissipation density of the graphene layer of the Au grating/graphene/h-BN/SiO2 hybrid structure was 4.4 times that of the Au grating/graphene/SiO2 control group structure， and the light absorption rate was 6.5 times that of the control group. At the same time， the absorption intensity can be regulated by controlling the thickness of h-BN， the thickness of the Au electrode and the gate width. This study provides a theoretical basis for the realization of mid-infrared photo-detectors based on graphene.关键词：graphene;hexagonal boron nitride;phonon polariton86|58|0更新时间：2025-02-20
Theoretical Calculation and Spectral Analysis
- “在爆炸物探测领域，研究人员结合有机小分子荧光探针与静电纺丝技术，开发出新型荧光纳米纤维膜传感器，有效拓宽了荧光探针的应用范围。”摘要：In recent years， advancements in the preparation and concealment of explosives have presented increasingly significant challenges for their detection. Organic small-molecule fluorescent probes with high sensitivity， high selectivity and low detection limit have become widely used in explosive identification. However， the identification of explosives by these fluorescent probes often needs to be carried out in solution， resulting in a significant limitation of their application. Electrospinning represents a highly effective technique for the fabrication of nanofibers characterized by controllable diameters and uniform morphologies. Fluorescent nanofiber membranes with the advantages of easy portability， good reproducibility and low detection limit were prepared by combining fluorescent probes with electrospinning technology， which effectively broadened the application of fluorescent probes in the detection of explosives. In this paper， the structure of fluorescence sensing units of organic small molecule materials is classified， and the effects of organic small molecule fluorescent nanofiber membrane sensors on common explosives such as trinitrotoluene （TNT）， trinitrophenol （TNP）， 2，4-dinitrotoluene （DNT） and cyclotrimethylene trinitramine （RDX）， triacetone triperoxide （TATP）， etc. are summarized， give guidance for the design of electrospun fluorescent nanofiber membranes in actual explosives detection， and provide new ideas for the practical application of fluorescent probes in complex environments.关键词：fluorescent probe;electrospinning;Explosive detection;Nano-thin film fibers156|74|0更新时间：2025-02-20
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Development of NIR Responsive Upconversion Nanosensor for Turn-on Detection of 4-Nonylphenol 增强出版 AI导读
“In the field of environmental monitoring, a breakthrough has been made. Researchers have developed a near-infrared responsive upconversion luminescence nanosensor for detecting 4-Nonylphenol, a harmful estrogenic endocrine disrupter. This highly sensitive and selective sensor operates in two linear ranges and boasts a low limit of detection, successfully tested in real milk samples. This advancement holds promise for sensing in food, environmental, and biological samples.”摘要：4-Nonylphenol （NP） is a kind of estrogen belonging to the endocrine disrupter， widely used in various agricultural and industrial goods. However， extensive use of NP with direct release to environment poses high risks to both human health and ecosystems. Herein， for the first time， we developed near-infrared （NIR） responsive upconversion luminescence nanosensor for NP detection. The Förster resonance energy transfer based upconversion nanoparticles （UCNPs）-graphene oxide sensor offers highly selective and sensitive detection of NP in linear ranges of 5-200 ng/mL and 200-1 000 ng/mL under 980 nm and 808 nm excitation， respectively， with LOD at 4.2 ng/mL. The sensors were successfully tested for NP detection in real liquid milk samples with excellent recovery results. The rare-earth fluoride based upconversion luminescence nanosensor with NIR excitation wavelength， holds promise for sensing food， environmental， and biological samples due to their high sensitivity， specific recognition， low LOD， negligible autofluorescence， along with the deep penetration of NIR excitation sources.关键词：Er3+/Yb3+/Nd3+;upconversion nanoparticles;Förster resonance energy transfer;estrogen;detection105|59|0更新时间：2025-02-20 - “最新研究报道，科研团队开发出一种新型荧光传感器，能高效检测罗丹明6G，具有高选择性、抗干扰能力和荧光稳定性。”摘要：Using the metal-organic frameworks UIO-66-NH2 as both carrier and fluorescence group， a surface molecularly imprinted fluorescence sensor （UIO-66-NH2@Rh6G@SMIPs） for detecting rhodamine 6G was prepared by precipitation polymerization. By characterizing the sensor using infrared spectroscopy， X-ray diffraction， etc.， it was confirmed that the molecularly imprinted fluorescence sensor was successfully synthesized. In the process of detecting rhodamine 6G， the fluorescence peaks of the sensor showed ratiometric changes. The ratio of fluorescence peak intensities I560/I440 were linearly related to the concentrations of rhodamine 6G with a detection limit of 12.77 nmol·L-1. In addition， UIO-66-NH2@Rh6G@SMIPs exhibited the advantages of high selectivity， good anti-interference ability and favorable fluorescence stability. The sensor was applied to detect rhodamine 6G in real samples. The recoveries of rhodamine 6G were 93.2%-104.2% with the relative standard deviations （RSD） of 0.9%-3.1% in lake water. While the recoveries were 92.7%-108.6% with the RSD of 1.9%-3.7% in dry pepper sample， which demonstrated that the sensor can meet the detection demand in complicated real samples. This work provides an efficient and feasible method for rapid detection of rhodamine 6G in real samples.关键词：metal-organic frameworks;ratiometric fluorescence;Molecularly Imprinted Polymers;Rhodamine155|35|0更新时间：2025-02-20
- “在金属离子响应和电致变色领域，科研人员采用一锅多步法成功制备了含氨基脲结构的六元螺环罗丹明SRh-NH，并对其结构进行了表征。”摘要：In order to explore the application of six-membered spirocycles in the field of metal ion response and electroluminescence， a six-membered spiro ring rhodamine SRh-NH containing semicarbazide structure was successfully designed and prepared by a one-pot multi-step method， and its structure was characterized. Similar to the five-membered spirocyclic rhodamine， SRh-NH is sensitive to acidity （ pH 3.0-6.0 ）. When pH > 6.0， the spirocyclic structure is more stable and less prone to ring-opening reaction， and its pKa is 4.62 （abs） and 4.76 （fl）， respectively. In terms of metal ion selectivity， both Cu2+ and Hg2+ can induce the ring-opening reaction of SRh-NH， and new absorption peaks and fluorescence peaks appear at 566 nm and 589 nm， respectively. The weak metal ion selectivity indicates that SRh-NH is more sensitive to Cu2+ and Hg2+， and the detection limits for Cu2+ and Hg2+ are 64 nmol/L（fl） and 2.7 μmol/L（fl）， respectively. At the same time， its competition is also susceptible to trivalent metal ions. In addition， using SRh-NH as the color-changing layer， the color and fluorescence of the film can be switched between colorless and deep red when the voltages of +1.0 V and -0.8 V are applied. The structure-activity relationship of SRh-NH indicates that the six-membered spiro ring structure has great application potential in the design and application of six-membered spiro ring rhodamine fluorescent probes and electrochromic fluorescent films.关键词：Six-membered spirorhodamine;metal ions;electrochromism;red fluorescence91|35|0更新时间：2025-02-20
- “最新研究发现，一种荧光碳点能有效抑制大肠杆菌和金黄色葡萄球菌生长，具有良好生物安全性，为开发新型抗菌药物提供重要参考。”摘要：In this paper， we report a fluorescent carbon dot with a guanidine group on the surface， which has excellent luminescence properties and biosafety， and can effectively inhibit Escherichia coli （E.coli） and Staphylococcus aureus （S. aureus）. We synthesized biguanide carbon dots （BHCDs） with fluorescent properties in both solid and liquid states by hydrothermal method using biguanide hydrochloride， dithiodibenzoic acid and acetic acid as raw materials. High-resolution transmission electron microscopy showed that the average grain of the carbon dot was 2.24 nm， and its emission wavelength was 420 nm， and it shifted backward with the increase of excitation wavelength. According to XPS and FTIR spectra， it is inferred that there is a guanidine group on the surface of BHCDs. Biological imaging experiments showed that BHCDs fluoresced blue when they entered zebrafish and could be completely metabolized out of the body within 96 h， which showed that BHCDs had good biological safety in combination with other toxicological experiments. BHCDs can effectively inhibit the growth of E.coli and S. aureus. In the process of exploring its antimicrobial mechanism， it was found that BHCDs have the ability to chelate Fe3+ and Cu2+. Furthermore， by comparing other guanidine carbon dots， several carbon dots with Fe3+ chelating ability could effectively inhibit E.coli， while polyhexamethylene biguanide carbon dots， polyaminopropyl biguanide carbon dots and dimethylguanidine carbon dots with Cu2+ chelating ability could also effectively inhibit S. aureus， while methylguanidine carbon dots without Cu2+ chelating ability did not have the inhibitory ability of S. aureus. It is speculated that the anti-S. aureus ability of BHCDs may be related to Cu2+ chelation. The BHCDs prepared in this study have good biosafety and antimicrobial properties， which provides an important reference for the development of new antimicrobial drugs and lays a theoretical basis for revealing their antimicrobial principles.关键词：carbon dots;biguanide hydrochloride;antimicrobial;metal chelation86|131|0更新时间：2025-02-20
- “在化学传感领域，科研团队成功合成新型荧光探针ASZ，实现对Zn2+的高灵敏度检测和生物成像。”摘要：A novel fluorescent probe ASZ was prepared by condensation reaction of coumarin aldehyde and substituted amine tetrazolium. The structure was characterized by high resolution mass spectrometry （HR-MS）， hydrogen nuclear magnetic resonance spectroscopy （1H NMR） and carbon nuclear magnetic resonance spectroscopy （13C NMR）. The maximum absorption wavelength of ASZ was redshifted by 80 nm in the present of Zn2+， which can realize the “naked eye” recognition for Zn2+. The probe ASZ can identify Zn2+ with high selectivity by fluorescence “OFF-ON” respond， the fluorescence intensity of the probe increased by 4 times after the identification of Zn2+， the detection limit of Zn2+ by ASZ was 9.94 nmol/L. The response mechanism of probe ASZ for Zn2+ was investigated by using HR-MS. The probe ASZ was used for semi-quantitative analysis of Zn2+ in water samples because of its good water solubility and strong anti-interference. More importantly， ASZ was successfully utilized to confocal imaging of exogenous Zn2+ in HeLa cells and fluorescence imaging of exogenous Zn2+ in mice in vivo due to its advantages of low biological toxicity and high sensitivity for Zn2+.关键词：fluorescent probe;coumarin;zinc ion;bioimaging96|39|0更新时间：2025-02-20
Luminescence Applications and Interdisciplinary Fields
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