Visible light activation of room temperature NO2 gas sensors based on ZnO, SnO2 and In2O3 sensitized with CdSe quantum dots

THIN SOLID FILMS

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Article; Proceedings Paper

Chizhov, A. S.¹  Rumyantseva, M. N.²  Vasiliev, R. B.^1,2  Filatova, D. G.²  Drozdov, K. A.³  Krylov, I. V.³  Marchevsky, A. V.¹  Karakulina, O. M.⁴  Abakumov, A. M.^4,5  Gaskov, A. M.² 

[1] Moscow MV Lomonosov State Univ, Dept Mat Sci, Leninskie Gory 1-21, Moscow 119991, Russia

[2] Moscow MV Lomonosov State Univ, Dept Chem, Leninskie Gory 1-3, Moscow 119991, Russia

[3] Moscow MV Lomonosov State Univ, Dept Phys, Leninskie Gory 1-2, Moscow 119991, Russia

[4] Univ Antwerp, Electon Microscopy Mat Res EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

[5] Skolkovo Innovat Ctr, Skolkovo Inst Sci & Technol Skoltech, Moscow 143026, Russia

关键词: Room temperature;    Semiconductor sensor;    Gas sensor;    Tin dioxide;    Zinc oxide;    Indium oxide;    Cadmium selenide;    Quantum dots;    Visible light activation;    Nitrogen dioxide;   

DOI  :  10.1016/j.tsf.2016.09.029

来源: Elsevier

【 摘 要 】

This work reports the analysis of visible light activation of room temperature NO2 gas sensitivity of metal oxide semiconductors (MOS): blank and CdSe quantum dots (QDs) sensitized nanocrystalline matrixes ZnO, SnO2 and In2O3. Nanocrystalline metal oxides (MOx) ZnO, SnO2, In2O3 were synthesized by the precipitation method. Colloidal CdSe QDs were obtained by high temperature colloidal synthesis. Sensitization was effectuated by direct adsorption of CdSe QDs stabilized with oleic add on MOx surface. The role of illumination consists in generation of electrons, which can be transferred into MOx conduction band, and holes that can recombine with the electrons previously trapped by the chemisorbed acceptor species and thus activate desorption of analyte molecules. Under green light illumination for blank SnO2 and In2O3 matrixes the indirect consequential mechanism for the generation of holes is proposed. Another mechanism is realized in the presence of CdSe QDs. In this case the electron-hole pair is generated in the CdSe quantum dot. Sensor measurements demonstrated that synthesized materials can be used for NO2 detection under visible (green) light illumination at room temperature without any thermal heating. (C) 2016 Elsevier B.V. All rights reserved.

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