The enhanced gas sensing characteristics of La2O 3-Doped SnO2by the addition of multi wall carbon nanotubes

Nguyen Van Hieu, Hae Ryong Kim, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review


A La-doped SnO2, (La-SnO2) nano sol solution containing multi-wall carbon nanotubes (MWCNTs) was prepared by hydrothermal reaction and the gas sensing characteristics of the La-SnO2/MWCNT composite sensors were investigated at various heat treatment temperatures (HTTs). The MWCNTs were unaffected, partially decomposed, and completely decomposed by the heat treatment at 500, 600, and 700 °C in air, respectively. However, regardless of the HTT variation, the gas responses to C2H6OH at 400 °C were increased 1.4-2.5 times by the addition of 0.1 wt% MWCNTs and the sensors showed selective detection to C 2H5OH. The mechanisms for the enhancement of gas response are discussed in relation to the decomposition of MWCNTs and its consequent effect on the gas sensing reaction.

Original languageEnglish
Pages (from-to)283-287
Number of pages5
JournalSensor Letters
Issue number1
Publication statusPublished - 2011


  • Carbon nanotubes
  • Ethanol sensor

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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