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    Hydrophobic and Rapid-Response Sensor Inks: Array-Based Fingerprinting of Perfumes

    Year: 2022

    Journal: ACS Appl. Mater. Interfaces, Volume 14, JUN 15, page 27339–27346

    Authors: Sun, Linlin; Zhang, Ruohan; Hu, Luoyu; Chen, Xiaofeng; Lu, Xiaohui; Li, Zheng

    Organizations: National Natural Science Foundation of China [22076125]; Natural Science Foundation of Guangdong Province for Distinguished Young Scholars [2021B1515020106]; Guangdong Joint Fund of Fundamental and Applied Research [2019A1515110242]; Science and Technology Innovation Commission of Shenzhen for Young Talent Plans [RCBS20200714114819132]

    Keywords: colorimetric sensor array; hydrophobic interface; fast response; perfumes; chemometric analysis; quality control

    Counterfeited perfumes mixed with inexpensive additives for commercial purposes pose a great threat to cosmetic market competition and human health. Herein, a 24-element, solid-state colorimetric sensor array employing chemo-responsive dye inks for accurate discrimination of a variety of fragrance bases and sniffing out real perfumes from adulterated samples was first reported. The physiochemical robustness and gas response kinetics of the sensor array were optimized with the streamlined design of the channel geometry and hydrophobic modification of the sensor substrate. A unique and distinguishable color change profile was obtained within 2 min exposure of diluted vapor that enabled clear fingerprinting of chemically similar perfume samples. Four commercial perfume products were successfully distinguished and categorized according to their similarity to relevant perfume bases using chemometric methods including hierarchical clustering and principal component analysis. The sensor array also allows the discrimination of ethanol-diluted fragrance bases from the pristine sample, revealing its potential for quality assurance of perfumes and other cosmetics. Such easy-to-use, disposable, and miniaturized chemical sensing detectors therefore prove exceptionally valuable for fast analysis of luxuries such as perfumes and other industrial products with complex chemical compositions.
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