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An enhanced gas sensor based on SiO 2 @mesoporous MCM-41 core-shell nanocomposites for SO 2 visual detection.
- Source :
-
The Analyst [Analyst] 2020 Jun 21; Vol. 145 (12), pp. 4352-4357. Date of Electronic Publication: 2020 Jun 05. - 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> .
Details
- Language :
- English
- ISSN :
- 1364-5528
- Volume :
- 145
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- The Analyst
- Publication Type :
- Academic Journal
- Accession number :
- 32501460
- Full Text :
- https://doi.org/10.1039/d0an00621a