Fast microwave-assisted synthesis of gas-sensing SnO2 quantum dots with high sensitivity

Lianfeng Zhu, Mengyun Wang, Tsz Kwan Lam, Changyue Zhang, Hongda Du, Baohua Li, Youwei Yao

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


Tin oxide (SnO2) quantum dots (QDs) have been prepared by microwave-assisted method. Firstly, through microwave-assisted method, organic component-wrapped SnO2 QDs with size of ca. 2-4 nm can be synthesized in only 0.5 min at 160 °C. Then, SnO2 of very good crystallinity and ca. 5-10 nm can be obtained by annealing the organic component-wrapped SnO2 QDs in air at 400 °C for 4 h. The annealed SnO2 QDs exhibit excellent gas sensitivity towards ethanol vapor. Typically, the relative resistance, i.e., ratio of resistance of sample in air to that in tested gases, of sensors towards 300 ppm of ethanol vapor is 215.

Original languageEnglish
Pages (from-to)646-653
Number of pages8
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2016 Nov 29
Externally publishedYes


  • Gas sensor
  • Microwave
  • Oleic acid
  • Oleylamine
  • Quantum dots
  • Tin oxide

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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