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Synthesis, Characterization of Silicon Quantum Dots and High Sensitivity Sensing for Cu2+
- Chinese Journal of Luminescence Vol. 42, Issue 1, Pages: 73-82(2021)
- 作者机构：
1.重庆安全技术职业学院, 重庆 404020
2.重庆海关技术中心, 重庆 400020
3.重庆三峡职业学院, 重庆 404155
- 作者简介：
- 基金信息：Youth Project of Science and Technology Research Program of Chongqing Education Commission of China;University Innovation Research Group Project of Chongqing Education Commission of China
DOI：10.37188/CJL.20200292
CLC： O482.31Published：2021-1，
Received：6 October 2020，
Accepted：26 October 2020
扫 描 看 全 文
Zhen-ping LIU, Ke-jing PANG, Rong JIANG, et al. Synthesis, Characterization of Silicon Quantum Dots and High Sensitivity Sensing for Cu2+. [J]. Chinese Journal of Luminescence 42(1):73-82(2021)
Zhen-ping LIU, Ke-jing PANG, Rong JIANG, et al. Synthesis, Characterization of Silicon Quantum Dots and High Sensitivity Sensing for Cu2+. [J]. Chinese Journal of Luminescence 42(1):73-82(2021) DOI： 10.37188/CJL.20200292.
摘要
通过一步无溶剂法合成了具有较好发光稳定性和水溶性的硅量子点（Silicon quantum dots，Si-QDs），并利用透射电镜（TEM）、红外吸收光谱（IR）、X射线光电子能谱（XPS）、X射线衍射（XRD）和荧光光谱等手段对其进行了表征。试验发现，Si-QDs在378 nm的激发光照射下，可产生峰值位于468 nm的宽带发光；在水溶液中，添加适量Cu
2+
可对Si-QDs的发光产生静态猝灭。利用荧光信号猝灭程度与Cu
2+
浓度之间稳定的相关性可实现对Cu
2+
的定量检测。优化条件下，Si-QDs荧光强度变化与Cu
2+
浓度在16.7~1 670 nmol·L
-1
范围内呈稳定的线性相关性，（
F
0
－
F
）/
F
0
=0.18808ln
C
（Cu
2+
）－0.41377（
R
2
=0.998），检出限低至4.7 nmol·L
-1
（
S
/
N
=3）。对多种实际水样品做了加标回收率试验，回收率介于89.47%~106.75%之间。本研究制备的Si-QDs用于水中Cu
2+
快速、高灵敏检测具有良好重复性和稳定性。
Abstract
In this study
silicon quantum dots(Si-QDs) with good luminous stability and water solubility were synthesized by one-pot solvent-free method and characterized by the transmission electron microscopy(TEM)
infrared spectroscopy(IR)
X-ray photoelectron spectroscopy(XPS)
X-ray diffraction(XRD) and fluorescence spectroscopy. It was found in the experiment that the Si-QDs emit broadband luminescence at 478 nm under the excitation at 378 nm. The luminescence of Si-QDs can be quenched statically by adding Cu
2+
in aqueous solution. The stable correlation between the degree of quenching of fluorescence signal and the concentrations of Cu
2+
was used to realize the quantitative detection of Cu
2+
. Under the optimized conditions
there was a stable correlation between the fluorescence intensity change of Si-QDs and the concentrations of Cu
2+
in the range of 16.7-1 670 nmol·L
-1
(
F
0
-
F
)/
F
0
=0.18808ln
C
(Cu
2+
)-0.41377(
R
2
=0.998)
and the detection limit was down to 4.7 nmol·L
-1
(
S
/
N
=3). Several actual water samples were detected
the recovery rates ranged from 89.47% to 106.75%. The Si-QD prepared in this study had good repeatability and stability for the rapid and highly sensitive detection of Cu
2+
in water.
关键词
硅量子点荧光传感材料铜离子水
Keywords
silicon quantum dotsfluorescence sensing materialcopper ionswater
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