Extremely sensitive ethanol sensor using Pt-doped SnO2 hollow nanospheres prepared by Kirkendall diffusion

Bo Young Kim, Jung Sang Cho, Ji Wook Yoon, Chan Woong Na, Chul Soon Lee, Jee Hyun Ahn, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The pure and 0.3 wt% Pt-doped SnO2 hollow nanospheres were prepared by the oxidation of pure and Pt-doped Sn nanoscrystals embedded in carbon matrix and their gas sensing characteristics were investigated. The formation of hollow morphology was attributed to the nanoscale Kirkendall effect due to rapid outward diffusion of Sn ions and relatively slow inward diffusion of oxygen. Pure SnO2 hollow nanospheres showed a high response (resistance ratio) of 93.3 when exposed to 5 ppm ethanol. The response to 5 ppm ethanol was significantly increased to 1399.9 with doping 0.3 wt% Pt. In addition, selectivity to ethanol was also enhanced by Pt doping. Ultrasensitive and selective detection of ethanol in pure and Pt-doped SnO2 nanospheres is explained by the effective electron depletion in hollow structures and catalytic promotion of gas sensing reaction.

Original languageEnglish
Pages (from-to)353-360
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume234
DOIs
Publication statusPublished - 2016 Oct 29

Keywords

  • Gas sensor
  • Hollow spheres
  • Kirkendall diffusion
  • Sensitivity
  • SnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry
  • Electrical and Electronic Engineering

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