Porous LaFeO3/SnO2 nanocomposite film for CO2 detection with high sensitivity

Abstract Perovskite LaFeO 3 nanocrystalline powder, synthesized by sol–gel method, was composited with SnO 2 nanopowders to fabricate porous LaFeO 3 /SnO 2 thick film sensors. The as-prepared sensors exhibit high gas sensitivity, fast response and low working temperature for CO 2 detection. The optimal sensing performance of LaFeO 3 /SnO 2 thick film sensors is obtained with the molar ratio of La/Sn = 1:1. The observed response is nearly 2 times higher than that of bare LaFeO 3 at 4000 ppm CO 2 and the response time is less than 20 s at 250 °C. CO 2 sensing mechanism of the as-prepared nanocomposites porous film is addressed. The results demonstrate that the as-formed P-N junctions can greatly enhance the carrier transfer efficiency which is attributed to the improved sensing performance. Moreover, the hydroxyl species absorbed on the surface of the nanocomposites are also involved in the sensing process.

[1]  F. Stern,et al.  Electronic properties of two-dimensional systems , 1982 .

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

[3]  T. Ishihara,et al.  Mixed Oxide Capacitor of CuO–BaSnO3 as a Sensor for CO2 Detection over a Wide Range of Concentration , 1991 .

[4]  Jörg-Uwe Meyer,et al.  A novel thick film conductive type CO2 sensor , 1996 .

[5]  Xinghua Li,et al.  Electrospun nanofibers of p-type NiO/n-type ZnO heterojunctions with enhanced photocatalytic activity. , 2010, ACS applied materials & interfaces.

[6]  Xianluo Hu,et al.  Sol-gel nanocasting synthesis of patterned hierarchical LaFeO3 fibers with enhanced catalytic CO oxidation activity. , 2011, Nanoscale.

[7]  Kengo Shimanoe,et al.  Basic approach to the transducer function of oxide semiconductor gas sensors , 2011 .

[8]  N. Bârsan,et al.  Modeling of sensing and transduction for p-type semiconducting metal oxide based gas sensors , 2010 .

[9]  Tatsumi Ishihara,et al.  Mixed Oxide Capacitor of CuO—BaTiO3 as a New Type CO2 Gas Sensor , 1992 .

[10]  Changmin Shi,et al.  CO2 sensing of La0.875Ca0.125FeO3 in wet vapor: a comparison of experimental results and first-principles calculations. , 2015, Physical chemistry chemical physics : PCCP.

[11]  R. Jayavel,et al.  Facile hydrothermal synthesis and characterization of LaFeO3 nanospheres for visible light photocatalytic applications , 2014, Journal of Materials Science: Materials in Electronics.

[12]  E. Samulski,et al.  Large-Scale, solution-phase growth of single-crystalline SnO2 nanorods. , 2004, Journal of the American Chemical Society.

[13]  C. Xie,et al.  La2O3-sensitized SnO2 nanocrystalline porous film gas sensors and sensing mechanism toward formaldehyde , 2013 .

[14]  K. Mohite,et al.  Fe doped hydroxyapatite thick films modified via swift heavy ion irradiation for CO and CO2 gas sensing application , 2014 .

[15]  Derek R. Miller,et al.  Nanoscale metal oxide-based heterojunctions for gas sensing: A review , 2014 .

[16]  M. Nieuwenhuizen,et al.  A SAW gas sensor for carbon dioxide and water. Preliminary experiments , 1990 .

[17]  Jian Zhen Ou,et al.  Two‐Dimensional Molybdenum Trioxide and Dichalcogenides , 2013 .

[18]  Temperature-programmed technique accompanied with high-throughput methodology for rapidly searching the optimal operating temperature of MOX gas sensors. , 2014, ACS combinatorial science.

[19]  Yumin Zhang,et al.  A high sensitivity gas sensor for formaldehyde based on silver doped lanthanum ferrite , 2014 .

[20]  Shun Mao,et al.  Modulating gas sensing properties of CuO nanowires through creation of discrete nanosized p-n junctions on their surfaces. , 2012, ACS applied materials & interfaces.

[21]  Gary W. Hunter,et al.  Novel Carbon Dioxide Microsensor Based on Tin Oxide Nanomaterial Doped With Copper Oxide , 2009 .

[22]  J. Fergus.  Perovskite oxides for semiconductor-based gas sensors , 2007 .

[23]  Ruisheng Hu,et al.  A novel efficient boron-doped LaFeO3 photocatalyst with large specific surface area for phenol degradation under simulated sunlight , 2015 .

[24]  Jifan Hu,et al.  CO2 sensing properties and mechanism of nanocrystalline LaFeO3 sensor , 2013 .

[25]  Y. Sadaoka.  NASICON based CO2 gas sensor with an auxiliary electrode composed of LiCO3-metal oxide mixtures , 2007 .

[26]  H. Fu,et al.  Synthesis of High-Activity TiO2-Based Photocatalysts by Compounding a Small Amount of Porous Nanosized LaFeO3 and the Activity-Enhanced Mechanisms , 2011 .

[27]  Tatsumi Ishihara,et al.  Application of Mixed Oxide Capacitor to the Selective Carbon Dioxide Sensor I . Measurement of Carbon Dioxide Sensing Characteristics , 1991 .

[28]  Nicolae Barsan,et al.  Neodymium Dioxide Carbonate as a Sensing Layer for Chemoresistive CO2 Sensing , 2009 .

[29]  J. A. Goldsmith,et al.  Factors affecting the infra-red spectra of some planar anions with D3h symmetry—III. The spectra of rare-earth carbonates and their thermal decomposition products , 1967 .

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

[31]  M. Baraton.  FT-IR surface study of nanosized ceramic materials used as gas sensors , 1996 .

[32]  Noritaka Mizuno,et al.  CO2-sensing characteristics of SnO2 element modified by La2O3 , 1993 .

[33]  Kwang Ho Kim,et al.  CO2-sensing characteristics of SnO2 thick film by coating lanthanum oxide , 2000 .

[34]  Makoto Egashira,et al.  Effect of macrostructural control of an auxiliary layer on the CO2 sensing properties of NASICON-based gas sensors , 2009 .

[35]  Chen-Sheng Yeh,et al.  Hydrothermal Synthesis of SnO2 Nanoparticles and Their Gas-Sensing of Alcohol , 2007 .

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

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