Vapor-phase growth of urchin-like Mg-doped ZnO nanowire networks and their application to highly sensitive and selective detection of ethanol

Chang Hoon Kwak, Hyung Sik Woo, Faissal Abdel-Hady, A. A. Wazzan, Jong Heun Lee

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Urchin-like Mg-doped ZnO nanowire networks were prepared by MgO-seeded vapor-phase growth of ZnO nanowires, and their potential as gas-sensing materials was investigated. The response (resistance ratio) of the urchin-like Mg-doped ZnO nanowire networks to 5 ppm C2H5OH at 350 °C was as high as 343, which is significantly higher than that of pure ZnO nanowire networks (7.0). In addition, the Mg-doped ZnO nanowire network sensors showed excellent selectivity to C2H5OH and an unprecedentedly high response (28.8) even to 0.25 ppm C2H5OH. The enhancement of the gas response and selectivity to C2H5OH was attributed to Mg-doping-induced decrease of the charge carrier concentration, the change of nanowire thickness/morphology, and the catalytic promotion of the C2H5OH sensing reaction.

Original languageEnglish
Pages (from-to)527-534
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume223
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • Gas response
  • Gas sensor
  • Mg-doped ZnO
  • Oxide nanowire network
  • Selectivity

ASJC Scopus subject areas

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

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