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Title: Perovskite nanoparticle-sensitized Ga2O3 nanorod arrays for CO detection at high temperature

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.
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [1]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. National Energy Technology Lab., Pittsburgh, PA (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. National Energy Technology Lab., Pittsburgh, PA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1944-8244; R&D Project: 16065; 16074; KC0403020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 8; Journal Issue: 14; Journal ID: ISSN 1944-8244
American Chemical Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY gas sensor; nanowire; catalyst; carbon monooxide; Center for Functional Nanomaterials; catalytic effect; harsh environment; semiconductor