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An enhanced gas sensor based on SiO2@mesoporous MCM-41 core–shell nanocomposites for SO2 visual detection.
- Source :
- Analyst; 6/21/2020, Vol. 145 Issue 12, p4352-4357, 6p
- Publication Year :
- 2020
-
Abstract
- A colorimetric sulfur dioxide (SO<subscript>2</subscript>) 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 (SiO<subscript>2</subscript>@MCM-41), and further loaded with a mixture of zinc chloride (ZnCl<subscript>2</subscript>), sodium nitroprusside (SNP) and hexamine as an SO<subscript>2</subscript> indicator. The sensing properties of SiO<subscript>2</subscript>@MCM-41 toward SO<subscript>2</subscript> 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 SO<subscript>2</subscript>. The limit of detection (LOD) is 2 ppm for SiO<subscript>2</subscript>@MCM-41 discs, which indicates high sensitivity to SO<subscript>2</subscript>. The performance of GDT suggested a linear relationship between the SO<subscript>2</subscript> concentration and the response length of the red portions in a range of 100–1000 ppm. This work shows promising potential of SiO<subscript>2</subscript>@MCM-41 as an easy, effective and rapid response sensing material for the in situ detection of SO<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00032654
- Volume :
- 145
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Analyst
- Publication Type :
- Academic Journal
- Accession number :
- 143787080
- Full Text :
- https://doi.org/10.1039/d0an00621a