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Issue 12, 2020
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An enhanced gas sensor based on SiO2@mesoporous MCM-41 core–shell nanocomposites for SO2 visual detection

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Abstract

A colorimetric sulfur dioxide (SO2) gas sensor based on a core–shell composite was developed. The composite was fabricated with a silicon dioxide core and a mesoporous MCM-41 shell (SiO2@MCM-41), and further loaded with a mixture of zinc chloride (ZnCl2), sodium nitroprusside (SNP) and hexamine as an SO2 indicator. The sensing properties of SiO2@MCM-41 toward SO2 were measured in solid powder, discs and a gas detection tube (GDT), respectively. Each of these sensing configurations showed a distinct color change from pale yellow to red, which indicates good potential for naked-eye detection of SO2. The limit of detection (LOD) is 2 ppm for SiO2@MCM-41 discs, which indicates high sensitivity to SO2. The performance of GDT suggested a linear relationship between the SO2 concentration and the response length of the red portions in a range of 100–1000 ppm. This work shows promising potential of SiO2@MCM-41 as an easy, effective and rapid response sensing material for the in situ detection of SO2.

Graphical abstract: An enhanced gas sensor based on SiO2@mesoporous MCM-41 core–shell nanocomposites for SO2 visual detection

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Supplementary files

Article information


Submitted
30 Mar 2020
Accepted
14 May 2020
First published
20 May 2020

Analyst, 2020,145, 4352-4357
Article type
Paper

An enhanced gas sensor based on SiO2@mesoporous MCM-41 core–shell nanocomposites for SO2 visual detection

J. Yang, F. Cheng, Z. Zhu, J. Feng, M. Xue, Z. Meng and L. Qiu, Analyst, 2020, 145, 4352 DOI: 10.1039/D0AN00621A

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