Preparation and Application of Highly Fluorescent Purple-emissive Carbon Dots for Optical pH Measurement

WU Congying; ZHAO Xue; LIU Yuhui; HE Jingzong; LIU Shilin; WU Qilin

doi:10.37188/CJL.20220330

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Preparation and Application of Highly Fluorescent Purple-emissive Carbon Dots for Optical pH Measurement

Luminescence Applications and Interdisciplinary Fields | 更新时间：2023-06-15

- Preparation and Application of Highly Fluorescent Purple-emissive Carbon Dots for Optical pH Measurement
  增强出版
- Chinese Journal of Luminescence Vol. 44, Issue 5, Pages: 921-931(2023)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
  
  国家自然科学基金重大项目(52090033/52090030)
- DOI：10.37188/CJL.20220330
  CLC： O482.31
- Published：05 May 2023，
  
  Received：13 September 2022，
  
  Revised：08 October 2022，
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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.

摘要

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。

Abstract

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.

关键词

高荧光紫色荧光碳点pH光学检测

Keywords

high luminescencepurple-emissive carbon dotsoptical pH sensing

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aState Key Laboratory for Modification of Chemical Fibers and Polymer Materials， Donghua University

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