Room temperature liquefied petroleum gas (LPG) sensor

The p-polyaniline/n-ZnO thin film heterojunction sensor for room temperature LPG detection was fabricated by electrodepositing polyaniline on chemical bath deposited ZnO film. The heterojunction showed rectifying behavior indicating the formation of a diode with ideality factor 1.10. The formation of diffusion free interface of heterojunction was confirmed from cross-sectional FESEM. The heterojunction sensor has quick and high response towards LPG as compared to N2 and CO2 and exhibited maximum response of 81% upon exposure of 1040 ppm of LPG. The LPG sensing mechanism for heterojunction is modeled through change in height of barrier potential.

[1]  M. Miyayama,et al.  New Approach to Selective Semiconductor Gas Sensors Using a de‐Biased pn Heterocontact , 1995 .

[2]  Junying Zhang,et al.  Luminescence of nanosized ZnO/polyaniline films prepared by self-assembly , 2007 .

[3]  R. Freer,et al.  NO2 sensitivity of a heterojunction sensor based on WO3 and doped SnO2 , 2003 .

[4]  V. Cammarata,et al.  Junction devices based on sulfonated polyaniline , 1998 .

[5]  Yulong Xu,et al.  Sensing behavior and mechanism of La2CuO4–SnO2 gas sensors , 2001 .

[6]  J. Bian,et al.  Room temperature defect related electroluminescence from ZnO homojunctions grown by ultrasonic spray pyrolysis , 2006 .

[7]  Hiroaki Yanagida,et al.  Gas sensitivity of ZnO/La2CuO4 heterocontacts , 1994 .

[8]  S. Ducharme,et al.  Heterojunction diode fabrication from polyaniline and a ferroelectric polymer , 2002 .

[9]  T. P. Gujar,et al.  Fabrication of n-CdTe/p-polyaniline heterojunction-based room temperature LPG sensor , 2008 .

[10]  D. Basak,et al.  ZnO/polyaniline based inorganic/organic hybrid structure: Electrical and photoconductivity properties , 2008 .

[11]  Xiaohua Zhou,et al.  Study on sensing mechanism of CuO–SnO2 gas sensors , 2003 .

[12]  K. Yoshino,et al.  Improvement of characteristics on polymer photovoltaic cells composed of conducting polymer - fullerene systems , 2005 .

[13]  Umakant M. Patil,et al.  Room temperature liquefied petroleum gas (LPG) sensor based on p-polyaniline/n-TiO2 heterojunction , 2008 .

[14]  Toshimasa Matsuoka,et al.  A study on a palladium-titanium oxide Schottky diode as a detector for gaseous components , 1980 .

[15]  Donal D. C. Bradley,et al.  Hybrid polymer/metal oxide solar cells based on ZnO columnar structures , 2006 .

[16]  C. Lokhande,et al.  CBD grown ZnO-based gas sensors and dye-sensitized solar cells , 2009 .

[17]  Chandrakant D. Lokhande,et al.  Liquefied petroleum gas (LPG) sensor properties of interconnected web-like structured sprayed TiO2 films , 2008 .

[18]  Xiaoyan Zeng,et al.  Fabrication of ZnO and its enhancement of charge injection and transport in hybrid organic/inorganic light emitting devices , 2007 .

[19]  H. Ohno,et al.  Repeated temperature modulation epitaxy for p-type doping and light-emitting diode based on ZnO , 2004 .

[20]  Tsukasa Yoshida,et al.  Improved photoelectrochemical performance of electrodeposited ZnO/EosinY hybrid thin films by dye re-adsorption. , 2004, Chemical communications.

[21]  Chemical deposition of nanocrystalline nickel oxide from urea containing bath and its use in liquefied petroleum gas sensor , 2008 .

[22]  D. Dhawale,et al.  An approach towards the growth of polyaniline nanograins by electrochemical route , 2009 .

[23]  C. Lokhande,et al.  Liquefied petroleum gas (LPG) sensing properties of nanocrystalline CdO thin films prepared by chemical route: Effect of molarities of precursor solution , 2008 .

[24]  C. Lokhande,et al.  A room temperature liquefied petroleum gas sensor based on all-electrodeposited n-CdSe/p-polyaniline junction , 2007 .

[25]  Norio Miura,et al.  CuO-SnO2 element for highly sensitive and selective detection of H2S , 1992 .