A high sensitivity gas sensor for formaldehyde based on silver doped lanthanum ferrite

Abstract The gas-sensing properties of silver doped lanthanum ferrite (Ag–LaFeO 3 ) compounds for formaldehyde were investigated in this paper. Ag–LaFeO 3 powders were prepared using sol–gel method combined with microwave chemical synthesis. The powders were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The formaldehyde gas-sensing characteristics for the sample were examined between 65 °C and 220 °C. The experimental results indicate that the sensor based on the sample Ag–LaFeO 3 shows excellent gas-sensing properties to formaldehyde gas and the operating temperature is very low. At the optimal operating temperature of 90 °C, the response of the sensor based on Ag–LaFeO 3 to 1 ppm formaldehyde is 25, while to other test gases, the response is all lower than 6. With increasing concentration of formaldehyde, the resistance of the sensor based on the sample Ag–LaFeO 3 increases. The response and recovery times for the sample to formaldehyde gas are 65 s and 60 s, respectively.

[1]  W. Kang,et al.  Analyzing the mechanism of hydrogen adsorption effects on diamond based MIS hydrogen sensors , 1996 .

[2]  Huiming Ji,et al.  Preparation and acetone sensitive characteristics of nano-LaFeO3 semiconductor thin films by polymerization complex method , 2006 .

[3]  T. Ishihara,et al.  Oxide ion conductivity in La(Sr)Ga(Fe,Mg)O3 and its application for solid oxide fuel cells , 2006 .

[4]  Benxia Li,et al.  Hierarchically assembled porous ZnO microstructures and applications in a gas sensor , 2011 .

[5]  Maria Luisa Grilli,et al.  The NO2 response of solid electrolyte sensors made using nano-sized LaFeO3 electrodes , 2001 .

[6]  S. Kaliaguine,et al.  Methanol oxidation on LaBO3 (B = Co, Mn, Fe) perovskite-type catalysts prepared by reactive grinding , 2008 .

[7]  Weimin Du,et al.  Preparation, characterization and gas-sensing properties of rare earth mixed oxides , 2004 .

[8]  Xiaogan Li,et al.  Room temperature impedance spectroscopy-based sensing of formaldehyde with porous TiO2 under UV illumination , 2013 .

[9]  Ning Han,et al.  CdO activated Sn-doped ZnO for highly sensitive, selective and stable formaldehyde sensor , 2011 .

[10]  S. Tsang,et al.  Ag doped WO3-based powder sensor for the detection of NO gas in air , 2003 .

[11]  Matteo Ferroni,et al.  Screen-printed perovskite-type thick films as gas sensors for environmental monitoring , 1999 .

[12]  Cao Ming.  The Material Properties Characterization of SiC Powder Surface-modified by Polyethylene Glycol , 2004 .

[13]  I. Castro-Hurtado,et al.  Studies of influence of structural properties and thickness of NiO thin films on formaldehyde detection , 2011 .

[14]  Sheikh A. Akbar,et al.  A selective room temperature formaldehyde gas sensor using TiO2 nanotube arrays , 2011 .

[15]  Peng Song,et al.  Formaldehyde-sensing characteristics of perovskite La0.68Pb0.32FeO3 nano-materials , 2005 .

[16]  Shaofang Li,et al.  A novel and sensitive formaldehyde gas sensor utilizing thermal desorption coupled with cataluminescence , 2010 .

[17]  Zhen-Lai Zhou,et al.  The fabrication and gas-sensing characteristics of the formaldehyde gas sensors with high sensitivity , 2008 .

[18]  Richard L. Davies,et al.  The development and functions of silver in water purification and disease control , 1997 .

[19]  Liang Feng,et al.  The fabrication and characterization of a formaldehyde odor sensor using molecularly imprinted polymers. , 2005, Journal of colloid and interface science.

[20]  Meng Guangyao,et al.  Effects of CdO dopant on the gas sensitivity properties of ZnFe2O4 semiconductors , 2000 .

[21]  Udo Weimar,et al.  Analysis of the noble metal catalytic additives introduced by impregnation of as obtained SnO2 sol–gel nanocrystals for gas sensors , 2000 .

[22]  Jun Yu,et al.  Study on a micro-gas sensor with SnO2–NiO sensitive film for indoor formaldehyde detection , 2008 .

[23]  Sunil K. Srivastava,et al.  Development of high sensitivity tin oxide based sensors for gas/odour detection at room temperature , 1998 .

[24]  Zeng Wen,et al.  Gas-sensing properties of SnO2–TiO2-based sensor for volatile organic compound gas and its sensing mechanism , 2010 .

[25]  Rong-Hua Ma,et al.  A self-heating gas sensor with integrated NiO thin-film for formaldehyde detection , 2007 .

[26]  Jinxing Wang,et al.  Synthesis, characterization, and gas-sensing property for HCHO of Ag-doped In2O3 nanocrystalline powders , 2009 .

[27]  Yoshihiko Sadaoka,et al.  Ozone detection in air using SmFeO3 gas sensor , 2005 .

[28]  M. Jiang,et al.  Preparation, electrical and gas-sensing properties of perovskite-type La1−xMgxFeO3 semiconductor materials , 2007 .

[29]  M. Hämmerle,et al.  Direct monitoring of organic vapours with amperometric enzyme gas sensors. , 2010, Biosensors & bioelectronics.

[30]  F. Kruis,et al.  Influence of Ag particle size on ethanol sensing of SnO1.8:Ag nanoparticle films: A method to develop parts per billion level gas sensors , 2006 .

[31]  Ning Han,et al.  Highly formaldehyde-sensitive, transition-metal doped ZnO nanorods prepared by plasma-enhanced chemical vapor deposition , 2012 .

[32]  Hengfu Shui,et al.  Investigation on formaldehyde gas sensor with ZnO thick film prepared through microwave heating method , 2009 .

[33]  Kae-Long Lin,et al.  Assessment of the strategies for reducing VOCs emission from polyurea-formaldehyde resin synthetic fiber leather industry in Taiwan , 2006 .