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Chemosensors 2018, 6(3), 34; https://doi.org/10.3390/chemosensors6030034

Nanoporous Silica-Dye Microspheres for Enhanced Colorimetric Detection of Cyclohexanone

Department of Chemical and Biomolecular Engineering, North Carolina State University, 911 Partner Way, Campus Box 7905, Raleigh, NC 27695, USA
Received: 18 July 2018 / Revised: 5 August 2018 / Accepted: 7 August 2018 / Published: 13 August 2018
(This article belongs to the Special Issue Hierarchical Nanostructures for Gas Sensors)
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Abstract

Forensic detection of non-volatile nitro explosives poses a difficult analytical challenge. A colorimetric sensor comprising of ultrasonically prepared silica-dye microspheres was developed for the sensitive gas detection of cyclohexanone, a volatile marker of explosives 1,3,5-trinitro-1,3,5-triazinane (RDX) and 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX). The silica-dye composites were synthesized from the hydrolysis of ultrasonically sprayed organosiloxanes under mild heating conditions (150 °C), which yielded microspherical, nanoporous structures with high surface area (~300 m2/g) for gas exposure. The sensor inks were deposited on cellulose paper and given sensitive colorimetric responses to trace the amount of cyclohexanone vapors even at sub-ppm levels, with a detection limit down to ~150 ppb. The sensor showed high chemical specificity towards cyclohexanone against humidity and other classes of common solvents, including ethanol, acetonitrile, ether, ethyl acetate, and ammonia. Paper-based colorimetric sensors with hierarchical nanostructures could represent an alternative sensing material for practical applications in the detection of explosives. View Full-Text
Keywords: silica-dye microspheres; hierarchical nanostructure; colorimetric sensing; gaseous cyclohexanone; ppb detection; explosive screening silica-dye microspheres; hierarchical nanostructure; colorimetric sensing; gaseous cyclohexanone; ppb detection; explosive screening
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Z. Nanoporous Silica-Dye Microspheres for Enhanced Colorimetric Detection of Cyclohexanone. Chemosensors 2018, 6, 34.

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