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SCI Article

A strip array of colorimetric sensors for visualizing a concentration level of gaseous analytes with
Author Hoang, Anh Tuan (Dept Bionano Engn); Cho, Yeong Beom (Dept Bionano Engn); Kim, Yong Shin (Dept Chem & Mol Engn); Kim, Yong Shin (Grad Sch Appl Chem);
Corresponding Author Info Kim, YS (reprint author), Hanyang Univ, Grad Sch Appl Chem, Ansan 15588, South Korea.
E-mail 메일yongshin@hanyang.ac.kr
Document Type Article
Source SENSORS AND ACTUATORS B-CHEMICAL Volume:251 Issue: Pages:1089-1095 Published:2017
Times Cited 0
External Information pdfhttp://dx.doi.org/10.1016/j.snb.2017.06.142
Abstract A colorimetric strip sensor array based on the naked-eye detection has been reported as a simple instrument-free device able to visually display a concentration level of gaseous analytes with basicity. The array has a vertically aligned configuration of five sensing elements and their detection sensitivities to basic analytes are controlled to decrease downwardly. The colorimetric sensors were fabricated by drop-casting a dye solution containing a pH indicator, an acid compound, and hydrophilic polyethylene glycol on a polyacrylonitrile nanofiber mat. The detection sensitivity was regulated by using different amounts of the acid compound in addition to variation in pH Indicator. When sensors containing a pH indicator of bromophenol blue (BPB), bromocresol green (BCG), or chlorophenol red (CPR) were exposed to ammonia gas, coloration happens considerably in the regions of 0-1, 0-5 and 10-100 ppm for BPB, BCG and CPR sensors, respectively. Furthermore, the detection sensitivity could be controlled to decrease by increasing an amount of citric acid, which reveals that the color-changing acid-base reactions between pH indicator and basic analytes are reduced by competitive interactions between the analytes and acid additive. As illustrations, two strip sensor arrays based on BPB and BCG dyes were fabricated and confirmed the successful naked-eye discrimination of a NH3 concentration level in the ranges of 1-50 and 5-100 ppm, respectively. The concentration level can be determined by a number of coloration elements in the strip device while its resolution relies on a total number of sensing elements. (C) 2017 Elsevier B.V. All rights reserved.
Web of Science Categories Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation
Funding Korea Ministry of Environment (MOE) as Environmental Technology Development Program of "Chemical Accident Prevention Technology Development Project"
Language English
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