Open AccessEffects of Pt Content on Room-Temperature Hydrogen Sensing Characteristics of Pt-SnO2 Nano-Composite Ceramics
Author(s) -
Caochuang Wang,
Pengcheng Li,
Yongming Hu,
Liqun Xu,
Zhiping Zhou,
Wanping Chen
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/735/1/012001
Subject(s) - hydrogen , chemisorption , catalysis , materials science , sintering , oxygen , composite number , metal , chemical engineering , ceramic , platinum , nanoparticle , nano , inorganic chemistry , nanotechnology , chemistry , metallurgy , composite material , organic chemistry , engineering
A series of Pt-SnO 2 nano-mixtures with 0, 0.25, 1 and 2.5 wt% Pt separately were prepared using SnO 2 nanoparticles and H 2 PtCl 6 . Through pressing and sintering, Pt-SnO 2 nano-composite ceramics with Pt nanoparticles well dispersed have been successfully prepared from the nano-mixtures. Their resistance is found to increase monotonously and greatly with increasing Pt content, which is increased by three orders of magnitude when Pt is increased from 0 to 2.5 wt%. All those samples with a Pt content show distinct responses to hydrogen at room temperature, while their hydrogen sensitivity and their recovery time both decease dramatically with increasing Pt content. These results strongly suggest that Pt as a catalyst promotes oxygen chemisorption on SnO 2 and the reaction between hydrogen and oxygen at room temperature. Pt thus has catalytic effects on both hydrogen and oxygen, which leads to quite complicated effects of Pt content on the room-temperature hydrogen sensing behaviors of semiconducting metal oxides.