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1.东华大学 纤维材料改性国家重点实验室, 上海 201620
2.东华大学 材料科学与工程学院, 上海 201620
[ "吴聪影(1998-),女,安徽亳州人,硕士,2023年于东华大学获得硕士学位,主要从事碳点制备及应用的研究。 E-mail: 2200476@mail.dhu.edu.cn" ]
[ "吴琪琳(1970-),女,安徽黄山人,博士,教授,博士生导师,2002年于东华大学获得博士学位,主要从事新型碳材料及其复合材料的研究。 E-mail: wql@dhu.edu.cn" ]
收稿日期:2022-09-13,
修回日期:2022-10-08,
纸质出版日期:2023-05-05
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吴聪影,赵雪,刘玉慧等.高效紫色荧光碳点制备及光学pH检测应用[J].发光学报,2023,44(05):921-931.
WU Congying,ZHAO Xue,LIU Yuhui,et al.Preparation and Application of Highly Fluorescent Purple-emissive Carbon Dots for Optical pH Measurement[J].Chinese Journal of Luminescence,2023,44(05):921-931.
吴聪影,赵雪,刘玉慧等.高效紫色荧光碳点制备及光学pH检测应用[J].发光学报,2023,44(05):921-931. DOI: 10.37188/CJL.20220330.
WU Congying,ZHAO Xue,LIU Yuhui,et al.Preparation and Application of Highly Fluorescent Purple-emissive Carbon Dots for Optical pH Measurement[J].Chinese Journal of Luminescence,2023,44(05):921-931. DOI: 10.37188/CJL.20220330.
紫色荧光碳点(P⁃CDs)的制备通常存在制备复杂、量子产率低、荧光强度低等缺点。本文以邻苯二胺(OPD)和间苯二胺(MPD)为氮源,柠檬酸为碳源,在120 ℃的低温条件下,通过一步水热法成功获得了绝对量子产率为5.3%的高荧光P⁃CDs。XPS和FT⁃IR结果表明,所有合成的P⁃CDs具有相似的官能团,但含量不同;OPD/MPD的比例可有效调控P⁃CDs的荧光强度。所得P⁃CDs具有较好的光稳定性和盐稳定性。值得注意的是,当pH为1~3或10~13时,P⁃CDs的荧光颜色明显转变为绿色。上述独特的pH依赖性荧光色行为确保了其在光学pH传感中的潜在应用。
The preparation of purple-emissive carbon dots (P-CDs) usually accompanies the disadvantages of complicated preparation, low quantum yield (QY) and low fluorescence intensity. Herein, we used o-phenylenediamine (OPD) and m-phenylenediamine (MPD) as nitrogen sources and citric acid (CA) as carbon source to prepare P-CDs. Only using simple one-step hydrothermal method under a low experimental temperature of 120 ℃, we successfully obtained highly luminescent P-CDs with absolute QY of 5.3%. The results of XPS and FT-IR revealed that all synthesized P-CDs contained similar functional groups but with different contents. The fluorescence intensity of P-CDs could be effectively regulated by the amount ratio of OPD to MPD. The resulting P-CDs also possessed considerable photostability and salt stability. Notably, the fluorescence color of P-CDs remarkably transformed into green as the pH being in the range of 1-3 or 10-13. The aforementioned unique pH-dependent fluorescence chromic behaviors ensured the potential application in the optical pH sensing.
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