Citation: Lin LI, Jia-Wei WANG, Yu-Jin HUO, Cai-Feng SUN, Han-Yue ZHANG, Cai-Feng ZHANG. Preparation of Polyvinylpyrrolidone-Protected Fluorescent Copper Nanoclusters for Rapid and Accurate Detection of Ethanol[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(12): 2113-2124. doi: 10.11862/CJIC.2021.258 shu

Preparation of Polyvinylpyrrolidone-Protected Fluorescent Copper Nanoclusters for Rapid and Accurate Detection of Ethanol

Lin LI ^{1, 2,,} ,
Jia-Wei WANG ¹ ,
Yu-Jin HUO ¹ ,
Cai-Feng SUN ^1,, ,
Han-Yue ZHANG ¹ ,
Cai-Feng ZHANG ^{1, 2}

1.
Department of Chemistry, Taiyuan Normal University, Jinzhong, Shanxi 030619, China
2.
Humic Acid Engineering and Technology Research Center of Shanxi Province, Jinzhong, Shanxi 030619, China

Corresponding author: Lin LI, lilin@tynu.edu.cn Cai-Feng SUN, 841322483@qq.com
Received Date: 15 July 2021
Revised Date: 31 October 2021

Figures(10)

Accurate quantitative detection of ethanol (EtOH) content is essential for environmental monitoring, clinical diagnosis, food testing, and drinking alcohol. A simple and green fluorescence colorimetry method utilizing sonochemical reduction method for the rapid and efficient detection of EtOH in alcoholic beverages has been established. The fluorescent copper nanoclusters (PVP-Cu NCs) were synthesized by using CuCl₂ as a copper source, 2-mercaptobenzothiazole (MBT) as a stabilizing agent, polyvinylpyrrolidone (PVP) as a protecting agent and ascorbic acid (AA) as a reducing agent. The resultant PVP-Cu NCs had a spherical shape with an average diameter of 6.0 nm and a strong fluorescent orange emission characteristic peak at 580 nm upon 340 nm excitation. The fluorescence copper nanoclusters possessed the advantages of excellent time, ultraviolet radiation and salt resistance stability. We found that PVP-Cu NCs had a good responsiveness to EtOH, and the fluorescence intensity was inversely proportionate to the EtOH volume fractions between 5% and 45% as a consequence of inducing aggregation of PVP-Cu NCs via changing its double layer and affecting its stability in the studied system. Based on the established calibration, the EtOH content was effectively evaluated with good precision. Furthermore, visible color transformation of this sensor paper was observed in the EtOH content range of 20%-60%, implying utility for visual EtOH detection. It is worth mentioning that the assay was successfully applied for the quantification of EtOH in commercial drink samples and the satisfying results were obtained.
- polyvinylpyrrolidone,
- 2-mercaptobenzothiazole,
- copper nanoclusters,
- ethanol visual detection,
- fluorescence colorimetry
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