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CuO–ZnO Micro/Nanoporous Array‐Film‐Based Chemosensors: New Sensing Properties to H 2 S
Author(s) -
Xu Zongke,
Duan Guotao,
Li Yue,
Liu Guangqiang,
Zhang Hongwen,
Dai Zhengfei,
Cai Weiping
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201304722
Subject(s) - nanoporous , materials science , transmission electron microscopy , substrate (aquarium) , scanning electron microscope , x ray photoelectron spectroscopy , porosity , chemical engineering , selectivity , nanotechnology , layer (electronics) , diffraction , analytical chemistry (journal) , chemistry , catalysis , optics , organic chemistry , oceanography , engineering , composite material , geology , physics
CuO–ZnO micro/nanoporous array‐films are synthesized by transferring a solution‐dipped self‐organized colloidal template onto a device substrate and sequent heat treatment. Their morphologies and structures are characterized by X‐ray diffraction, field‐emission scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectrum analysis. Based on the sensing measurement, it is found that the CuO–ZnO films prepared with the composition of [Cu 2+ ]/[Zn 2+ ]=0.005, 0.01, and 0.05 all show a nice sensitivity to 10 ppm H 2 S. Interestingly, three different zones exist in the patterns of gas responses versus H 2 S concentrations: a platform zone, a rapidly increasing zone, and a slowly increasing zone. Further experiments show that the hybrid CuO–ZnO porous film sensor exhibits shorter recovery time and better selectivity to H 2 S gas against other interfering gases at a concentration of 10 ppm. These new sensing properties may be due to a depletion layer induced by p–n junction between p‐type CuO and n‐type ZnO and high chemical activity of CuO to H 2 S. This work will provide a new construction route of ZnO‐based sensing materials, which can be used as H 2 S sensors with high performances.