Improved H2S sensing properties of Ag/TiO2 nanofibers

Abstract Pristine and Ag nanoparticle modified TiO 2 nanofibers were fabricated by an electrospinning technique using polyvinyl pyrrolidone (PVP) and tetrabutyl titanate as precursor. The morphology and structure of the as-synthesized nanofibers were characterized by scanning electron microscopy and X-ray diffraction. It was found that the presence of Ag had a significant effect on the morphology and crystal structure of TiO 2 nanofibers, and that Ag addition could promote the phase transformation from anatase to rutile. H 2 S sensing properties of the sensors based on TiO 2 nanofibers were also investigated. The results showed that Ag/TiO 2 nanofibers exhibited better gas sensing performances than pristine TiO 2 nanofibers and the possible sensing mechanism was discussed.

[1]  M. Vannice,et al.  Formaldehyde Oxidation over Ag Catalysts , 1995 .

[2]  Feng Liu,et al.  Fabrication and gas sensing properties of hollow core–shell SnO2/α-Fe2O3 heterogeneous structures , 2014 .

[3]  Y. Yun,et al.  Effect of silver doping on the phase transformation and grain growth of sol-gel titania powder , 2003 .

[4]  Z. Wen,et al.  Formaldehyde gas sensing property and mechanism of TiO2–Ag nanocomposite , 2010 .

[5]  Sheikh A. Akbar,et al.  TiO2–SnO2 nanostructures and their H2 sensing behavior , 2005 .

[6]  Sheikh A. Akbar,et al.  Gas Sensors Based on One Dimensional Nanostructured Metal-Oxides: A Review , 2012, Sensors.

[7]  Y. Lei,et al.  Pd/TiO2 Nanofibrous Membranes and Their Application in Hydrogen Sensing , 2009 .

[8]  P. M. Perillo,et al.  A room temperature chloroform sensor using TiO2 nanotubes , 2014 .

[9]  D. Y. Kim,et al.  Ultrasensitive chemiresistors based on electrospun TiO2 nanofibers. , 2006, Nano letters.

[10]  A. Rothschild,et al.  Microstructure evolution of TiO2 gas sensors produced by electrospinning , 2012 .

[11]  Jun Zhang,et al.  Low-temperature H2S sensors based on Ag-doped α-Fe2O3 nanoparticles , 2008 .

[12]  Jianfeng Jia,et al.  Electrospun Cu-doped ZnO nanofibers for H2S sensing , 2011 .

[13]  Prabir K. Dutta,et al.  Interaction of Carbon Monoxide with Anatase Surfaces at High Temperatures: Optimization of a Carbon Monoxide Sensor , 1999 .

[14]  Shan Gao,et al.  Ag nanoparticles modified TiO2 spherical heterostructures with enhanced gas-sensing performance , 2011 .

[15]  Sang Min Lee,et al.  Enhanced ethanol sensing properties of TiO2 nanotube sensors , 2012 .

[16]  Xuchuan Jiang,et al.  Controllable Synthesis of ZnO Nanoflakes with Exposed (101̅0) for Enhanced Gas Sensing Performance , 2013 .

[17]  S. Bourgeois,et al.  Investigation on sol–gel synthesized Ag-doped TiO2 cermet thin films , 2005 .

[18]  Junming Xu,et al.  Shape-regulated synthesis of cobalt oxide and its gas-sensing property , 2015 .

[19]  S. Seutter,et al.  Small, uniform, and thermally stable silver particles on TiO2(110)-(1×1) , 2000 .

[20]  Pooi See Lee,et al.  Chemical sensing investigations on Zn–In2O3 nanowires , 2012 .

[21]  Ju-Young Park,et al.  Influence of silver doping on the phase transformation and crystallite growth of electrospun TiO2 nanofibers , 2010 .

[22]  Il-Doo Kim,et al.  Pd-doped TiO2 nanofiber networks for gas sensor applications , 2010 .

[23]  Jianyong Yu,et al.  Functionalized nanoporous TiO2 fibers on quartz crystal microbalance platform for formaldehyde sensor , 2012 .

[24]  Sheikh A. Akbar,et al.  Carbon Monoxide and Hydrogen Detection by Anatase Modification of Titanium Dioxide , 1992 .