Citation: YANG Qian-Hui, HAO Qing, LEI Jian-Ping, JU Huang-Xian. Photoelectron-Regulated Redox Reaction of Polyaniline for Visual Detection of Trace Copper[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(12): 1895-1902. doi: 10.11895/j.issn.0253-3820.171290 shu

Photoelectron-Regulated Redox Reaction of Polyaniline for Visual Detection of Trace Copper

State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China

Corresponding author: LEI Jian-Ping, jpl@nju.edu.cn JU Huang-Xian, hxju@nju.edu.cn
Received Date: 3 October 2017
Accepted Date: 8 November 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21375060, 21675084, 21635005)the National Natural Science Foundation of China 21635005the National Natural Science Foundation of China 21375060the National Natural Science Foundation of China 21675084

Figures(8)

A photochromic sensing platform composing of emeraldine salt of polyaniline (ES-PANI) and titanium dioxide nanoparticles (TiO₂ NPs) for visual detection of trace copper was developed. Under ultraviolet light irradiation, the greenish ES-PANI could be oxidized to dark blue pernigraniline salt by the photogenerated hole of excited TiO₂ NPs. In the presence of Cu²⁺, a light yellow leucoemeraldine salt was visually observed. The overall mechanism of color change was verified to be corresponding to the different redox states of PANI regulated by Cu species during the photochromic process. By integrating the advantages of both photoelectric property and visual detection, the redox reaction-based sensing mechanism led to a good sensitivity and high selectivity in the detection of Cu²⁺ with the detection limit of 0.4 μmol/L. Besides the naked eye, two color recognition methods including reading mean green intensities in Photoshop and recording ultraviolet absorbance in microplate reader were also studied. This method was successfully applied to Cu²⁺ detection in human hair with satisfactory recoveries. More significantly, this sensing platform was really simple, low-cost and able to detect an array of analytes within several minutes without requiring sophisticated equipment. This photoelectron-regulated colorimetric strategy provided a novel concept for the design of visual sensing platform, and could develop the portable test kits for rapid detection in clinical diagnosis.
- Visual detection,
- Photoelectric effect,
- Redox reaction,
- Polyaniline,
- Copper ion
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