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Room temperature gas sensor based on tube-like hydroxyapatite modified with gold nanoparticles.
- Source :
- Journal of Central South University; Jan2016, Vol. 23 Issue 1, p18-26, 9p
- Publication Year :
- 2016
-
Abstract
- The main goal of this work is to explore the possibility of using Au-modified hydroxyapatite (HA) as a potential sensor material. Tube-like HA structure was fabricated with the aid of a Nafion N-117 cation exchange membrane and gold (Au) nanoparticles were added by a hydrothermal method. The morphology, structure and composition were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The gas sensing properties were also investigated. Results show that Au nanoparticles are dispersed into the HA powder, which is tube-like, with rough inner and outer surfaces. Compared with pure HA, Au-modified HA exhibits improved sensing properties for NH. 5% (mass fraction) Au-modified HA shows the highest response with relatively short response/recovery time. The response is up to 79.2% when the corresponding sensor is exposed to 200×10 NH at room temperature, and the response time and recovery time are 20 s and 25 s, respectively. For lower concentration, like 50×10, the response is still up to 70.8%. Good selectivity and repeatability are also observed. The sensing mechanism of high response and selectivity for NH gas was also discussed. These results suggest that Au-HA composite is a promising material for NH sensors operating at room temperature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20952899
- Volume :
- 23
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Central South University
- Publication Type :
- Academic Journal
- Accession number :
- 112193571
- Full Text :
- https://doi.org/10.1007/s11771-016-3044-x