Visible light activated room temperature gas sensors based on nanocrystalline ZnO sensitized with CdSe quantum dots

A. S. Chizhov, M. N. Rumyantseva, R. B. Vasiliev, D. G. Filatova, K. A. Drozdov, I. V. Krylov, A. M. Abakumov, A. M. Gaskov

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

This work reports the study of photoconductivity and visible light activated room temperature gas sensors properties of nanocrystalline ZnO thick films sensitized with colloidal CdSe quantum dots (QDs). Nanocrystalline zinc oxide (ZnO) was synthesized by the precipitation method. Colloidal CdSe quantum dots were obtained by high temperature colloidal synthesis. Sensitization was effectuated by three different procedures including direct adsorption of CdSe QDs stabilized with oleic acid on ZnO surface, anchoring to the ZnO surface through a bifunctional molecule of mercaptopropionic acid (MPA), and coating of CdSe QDs with a monolayer of MPA with subsequent adsorption on ZnO surface. Sensor measurements demonstrated that obtained QD CdSe/ZnO nanocomposites can be used for NO2 detection under visible (green) light illumination at room temperature without any thermal heating.

Original languageEnglish
Pages (from-to)305-312
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume205
DOIs
Publication statusPublished - 15 Dec 2014
Externally publishedYes

Keywords

  • CdSe quantum dots
  • NO detection
  • Room temperature semiconductor gas
  • sensor
  • Visible light activation
  • Zinc oxide

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