High-sensitive liquid crystal-based optical sensor for real-time detection of formaldehyde vapor

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-02-11 DOI:10.1016/j.snb.2025.137424

Zhongyu Chen, Shaohai Fu, Yu Guan

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引用次数: 0

Abstract

In this study, we develop an optical liquid crystal (LC) sensor based on dodecylamine doped 4-cyano-4’-pentylbiphenyl (5CB) to accomplish real-time detection of formaldehyde (FA) vapor. When exposed to FA at ppm level, the LC sensor doped with 0.1 wt% dodecylamine shows a rapid dark-to-bright optical response within 10 s. The optical response of the LC sensor increases with the increasing concentration of FA vapor from 16.5 ppm to 824.1 ppm. This response is caused by the intermolecular force between dodecylamine and FA, which is verified by the Fourier transform infrared (FT-IR) spectrum. Meanwhile, the sensor demonstrates wide operational temperature range from 15℃ to 35℃, wide operational humidity range from 30% to 80% relative humidity (RH), high selectivity for FA vapor, excellent reversibility after 10 continuous tests, and reliable stability after storing at room temperature for 1 week. Overall, this LC sensor shows fast response, favorable specificity, excellent reversibility, and reliable stability, leading to a wider range of applications for FA detection.

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.