Perovskite nanoparticle-sensitized Ga2O3 nanorod arrays for CO detection at high temperature
- Univ. of Connecticut, Storrs, CT (United States)
- National Energy Technology Lab., Pittsburgh, PA (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- National Energy Technology Lab., Pittsburgh, PA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Here, noble metal nanoparticles are extensively used for sensitizing metal oxide chemical sensors through the catalytic spillover mechanism. However, due to earth-scarcity and high cost of noble metals, finding replacements presents a great economic benefit. Besides, high temperature and harsh environment sensor applications demand material stability under conditions approaching thermal and chemical stability limits of noble metals. In this study, we employed thermally stable perovskite-type La0.8Sr0.2FeO3 (LSFO) nanoparticle surface decoration on Ga2O3 nanorod array gas sensors and discovered an order of magnitude enhanced sensitivity to carbon monoxide at 500 °C. The LSFO nanoparticle catalysts was of comparable performance to that achieved by Pt nanoparticles, with a much lower weight loading than Pt. Detailed electron microscopy and X-ray photoelectron spectroscopy studies suggested the LSFO nanoparticle sensitization effect is attributed to a spillover-like effect associated with the gas-LSFO-Ga2O3 triple-interfaces that spread the negatively charged surface oxygen ions from LSFO nanoparticles surfaces over to β-Ga2O3 nanorod surfaces with faster surface CO oxidation reactions.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704
- OSTI ID:
- 1328390
- Report Number(s):
- BNL-112718-2016-JA; R&D Project: 16065; 16074; KC0403020
- Journal Information:
- ACS Applied Materials and Interfaces, Vol. 8, Issue 14; ISSN 1944-8244
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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