title: A Room Temperature H₂ Sensor Fabricated Using High Performance Pt-Loaded SnO₂ Nanoparticles.
abstract: Highly sensitive H2 gas sensors were prepared using pure and Pt-loaded SnO2 nanoparticles. Thick film sensors (~35 μm) were fabricated that showed a highly porous interconnected structure made of high density small grained nanoparticles. Using Pt as catalyst improved sensor response and reduced the operating temperature for achieving high sensitivity because of the negative temperature coefficient observed in Pt-loaded SnO2. The highest sensor response to 1000 ppm H2 was 10,500 at room temperature with a response time of 20 s. The morphology of the SnO2 nanoparticles, the surface loading concentration and dispersion of the Pt catalyst and the microstructure of the sensing layer all play a key role in the development of an effective gas sensing device.
authors.affiliation: Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan. scwang@mail.stust.edu.tw.
authors.forename: Sheng-Chang
authors.initials: SC
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan. omar.offgridsolutions@gmail.com.
authors.forename: Muhammad Omar
authors.initials: MO
authors.lastname: Shaikh
keywords: gas sensor; porous microstructure; thick film