A novel method for improving the performance of ZnO gas sensors

Abstract A novel ZnO porous nanosolid has been prepared by hydrothermal hot-press method, and the measurements indicated that it had very uniform pore size. Compared with the sensor fabricated from conventional ZnO nanoparticles (denoted as S-1), the sensor from ZnO porous nanosolid (denoted as S-2) showed much better sensing performance towards several organic vapors; the intrinsic resistance of S-2 in air dramatically decreased and its selectivity was improved. The optimum working temperature of S-2 was 370 °C, whereas that of S-1 was as high as 420 °C. The differences in gas sensing performance between the two kinds of sensors were analyzed based on the scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) measurements.

[1]  Makoto Egashira,et al.  Gas-sensing properties of ordered mesoporous SnO2 and effects of coatings thereof , 2003 .

[2]  H. Hong,et al.  Thick-film zinc-oxide gas sensor for the control of lean air-to-fuel ratio in domestic combustion systems , 1995 .

[3]  G. Rao,et al.  Gas sensitivity of ZnO based thick film sensor to NH3 at room temperature , 1999 .

[4]  Jin-seong Park,et al.  ZnO sol–gel derived porous film for CO gas sensing , 2003 .

[5]  T. Seiyama,et al.  A New Detector for Gaseous Components Using Semiconductive Thin Films. , 1962 .

[6]  R. N. Karekar,et al.  Formulation and characterization of ZnO:Sb thick-film gas sensors , 1998 .

[7]  Duk-Dong Lee,et al.  Recognition of volatile organic compounds using SnO2 sensor array and pattern recognition analysis , 2001 .

[8]  Norio Miura,et al.  Zinc-oxide-based semiconductor sensors for detecting acetone and capronaldehyde in the vapour of consommé soup , 1995 .

[9]  Katarzyna Zakrzewska,et al.  SnO2–TiO2 solid solutions for gas sensors , 1998 .

[10]  Qingyi Pan,et al.  Grain size control and gas sensing properties of ZnO gas sensor , 2000 .

[11]  Tae-Ha Kwon,et al.  Zinc oxide thin film doped with Al2O3, TiO2 and V2O5 as sensitive sensor for trimethylamine gas , 1998 .

[12]  Hao Gong,et al.  Interaction between thin-film tin oxide gas sensor and five organic vapors , 1999 .

[13]  S. Basu,et al.  Room-temperature hydrogen sensors based on ZnO , 1997 .

[14]  Makoto Egashira,et al.  Preparation and gas-sensing properties of thermally stable mesoporous SnO2 , 2002 .

[15]  Partha Mitra,et al.  ZnO thin film sensor , 1998 .

[16]  Duk-Dong Lee,et al.  Fabrication and characteristics of SnO2 gas sensor array for volatile organic compounds recognition , 2002 .

[17]  M. Jiang,et al.  Preparation and characterization of TiO2 bulk porous nanosolids , 2005 .

[18]  B.Bhooloka Rao,et al.  Zinc oxide ceramic semi-conductor gas sensor for ethanol vapour , 2000 .

[19]  G. Choi,et al.  Microstructure and CO gas sensing properties of porous ZnO produced by starch addition , 1997 .

[20]  Shuichi Kagawa,et al.  Study on a Detector for Gaseous Components Using Semiconductive Thin Films. , 1966 .