title: Improvement of Gas Sensing Characteristics by Adding Pt Nanoparticles on ZnO-Branched SnO2 Nanowires.
abstract: We coated zinc-oxide (ZnO)-branched tin oxide (SnO2) nanowires with a Pt shell layer via a sputtering method and subsequently annealed the composite to generate Pt nanoparticles. The spillover effect of Pt nanoparticles was expected to play a significant role in enhancing the response. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy revealed that the nanoparticles were comprised of a cubic Pt phase. A sensing test with NO2 gas revealed that the sensor response to NO2 gas was significantly increased, being related to the spillover effect of the Pt nanoparticles. As a result of the Pt-functionalization, the sensor response time and recovery time were decreased and increased, respectively. The high sensor response and fast response time make Pt-functionalized ZnO branched nanowires a promising candidate for gas sensors. The present work will be useful in exploring new areas of multiple-component nanosystems.
authors.forename: Han Gil
authors.initials: HG
authors.lastname: Na
authors.forename: Yong Jung
authors.initials: YJ
authors.lastname: Kwon
authors.forename: Hong Yeon
authors.initials: HY
authors.lastname: Cho
authors.forename: Sung Yong
authors.initials: SY
authors.lastname: Kang
authors.forename: Hyoun Woo
authors.initials: HW
authors.lastname: Kim