Synthesis and gas sensing characteristics of highly crystalline ZnO-SnO2 core-shell nanowires

In Sung Hwang, Sun Jung Kim, Joong Ki Choi, Jaewan Choi, Hyunjin Ji, Gyu-Tae Kim, Guozhong Cao, Jong Heun Lee

Research output: Contribution to journalArticle

156 Citations (Scopus)

Abstract

The ZnO-SnO2 core-shell nanowires (NWs) were synthesized by a continuous two-step vapor growth method at different synthesis temperatures. A crystalline 15-20 nm-thick, SnO2 shell layer was pseudo-epitaxially coated on ZnO NWs with a diameter of 50-80 nm. The gas response of the ZnO-SnO2 core-shell NW sensor to 10 ppm NO2 reached ∼33 times enhancement compared to that of the ZnO NWs at 200 °C. In addition, the ZnO-SnO2 core-shell NW sensors showed selective detection to NO2 at 200-300 °C and to C2H 5OH at 400 °C. The enhanced gas responses to NO2 and C2H5OH are discussed in relation to the thin SnO 2 shell layer and core-shell configuration of the NWs.

Original languageEnglish
Pages (from-to)595-600
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume148
Issue number2
DOIs
Publication statusPublished - 2010 Jul 15

Keywords

  • CHOH sensor
  • Core-shell nanowires
  • Gas sensors
  • NO sensor
  • ZnO-SnO

ASJC Scopus subject areas

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

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