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Ultra-sensitive room-temperature H2S sensor using Ag-In2O3 nanorod composites.
- Source :
- Journal of Materials Science; Dec2018, Vol. 53 Issue 24, p16331-16344, 14p, 2 Color Photographs, 1 Chart, 7 Graphs
- Publication Year :
- 2018
-
Abstract
- Ultra-sensitive H<subscript>2</subscript>S sensors operated at room temperature were fabricated using Ag-In<subscript>2</subscript>O<subscript>3</subscript> nanorod composites synthesized using sol-hydrothermal method followed by NaBH<subscript>4</subscript> reduction process. TEM proved that the In<subscript>2</subscript>O<subscript>3</subscript> was nanorod structures of ~ 110 nm in length and ~ 35 nm in diameter. Ag nanoparticles with diameters from 10 to 15 nm homogeneously decorated on the surfaces of the In<subscript>2</subscript>O<subscript>3</subscript> naonorods. XRD and XPS analysis proved that the Ag elements existed as zero-valent metallic silver on the surface of the In<subscript>2</subscript>O<subscript>3</subscript> nanorods. Ag nanoparticles could enhance the formation of chemisorbed oxygen species and interactions between H<subscript>2</subscript>S molecules and oxygen species due to spillover effect, and the electron transfer between Ag and In<subscript>2</subscript>O<subscript>3</subscript> nanorods also enhanced the sensing properties. Therefore, the H<subscript>2</subscript>S sensors based on the Ag-In<subscript>2</subscript>O<subscript>3</subscript> nanorod composites showed significantly improved sensing performance than those based on the pure In<subscript>2</subscript>O<subscript>3</subscript> nanorods. The optimized content of Ag nanoparticles is 13.6 wt%. Operated at room temperature, the H<subscript>2</subscript>S sensors made of 13.6 wt% Ag-In<subscript>2</subscript>O<subscript>3</subscript> nanorod composites exhibited an ultra-high response of 93719 to 20 ppm H<subscript>2</subscript>S and a superior detection limit of 0.005 ppm. The sensor also showed good reversibility, good selectivity, excellent reproducibility and stability for detection of H<subscript>2</subscript>S gas. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 53
- Issue :
- 24
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 132022071
- Full Text :
- https://doi.org/10.1007/s10853-018-2789-z