New insight into the gas sensing performance of SnO2 Nanorod-assembled urchins based on their assembly density

Abstract The manner how nano building blocks assemble into hierarchical architectures exerts a tremendous influence on gas-sensing performance of the metal oxides. Herein, we focus on tuning the 1D nanorods into 3D hierarchical urchins with various assembly densities, aiming at investigating the effect between gas diffusion and charge transfer. Via modulating the additive amount of NaOH, loose-, moderate- and close-assembled SnO 2 nanourchins aggregated with nanorods were successfully prepared, respectively. The relationships of nanorond assembly behavior to specific surface and average pore size of the urchin-like nanostructures were discussed in detail. A comparison study reveals that an enhanced gas sensing performance for the sensor made of the moderate-assembled SnO 2 nanourchins towards ethanol occurs over the other two, implying that perhaps there exists an optimizing assembly density range which provides not only enough space for gas diffusion but also sufficient contact network for charge transfer, in terms of good contacts among nanorods in an urchin-like sphere and among nanorods from adjacent spheres.

[1]  J. Tu,et al.  Superior ethanol-sensing behavior based on SnO2 mesocrystals incorporating orthorhombic and tetragonal phases , 2015 .

[2]  G. Korotcenkov.  Metal oxides for solid-state gas sensors: What determines our choice? , 2007 .

[3]  G. Korotcenkov.  The role of morphology and crystallographic structure of metal oxides in response of conductometric-type gas sensors , 2008 .

[4]  Alfons Schulte,et al.  A rapid hydrothermal synthesis of rutile SnO2 nanowires , 2009 .

[5]  Weifeng Zhang,et al.  A highly efficient flexible dye-sensitized solar cell based on nickel sulfide/platinum/titanium counter electrode , 2015, Nanoscale Research Letters.

[6]  A. M. Suhail,et al.  Palladium - Doped ZnO Thin Film Hydrogen Gas Sensor , 2011 .

[7]  Zhongchang Wang,et al.  Nanosheet-assembled hierarchical SnO2 nanostructures for efficient gas-sensing applications , 2016 .

[8]  G. Lu,et al.  Horseshoe-shaped SnO2 with annulus-like mesoporous for ethanol gas sensing application , 2017 .

[9]  Jing Bai,et al.  Titanium dioxide nanomaterials for sensor applications. , 2014, Chemical reviews.

[10]  J. H. Lee,et al.  Highly sensitive and selective gas sensors using p-type oxide semiconductors: Overview , 2014 .

[11]  Jing Wang,et al.  Mechanism for toluene detection of flower-like ZnO sensors prepared by hydrothermal approach: Charge transfer , 2015 .

[12]  L. Wan,et al.  Room Temperature Ionic Liquids Assisted Green Synthesis of Nanocrystalline Porous SnO2 and Their Gas Sensor Behaviors , 2008 .

[13]  N. Bârsan,et al.  Metal oxide-based gas sensor research: How to? , 2007 .

[14]  Zhongchang Wang,et al.  Quasi-one-dimensional metal-oxide-based heterostructural gas-sensing materials: A review , 2015 .

[15]  Yuan Zhang,et al.  Brush-Like Hierarchical ZnO Nanostructures: Synthesis, Photoluminescence and Gas Sensor Properties , 2009 .

[16]  Adam Burrows,et al.  CAN TiO EXPLAIN THERMAL INVERSIONS IN THE UPPER ATMOSPHERES OF IRRADIATED GIANT PLANETS? , 2009, 0902.3995.

[17]  F. Roubani-Kalantzopoulou,et al.  Chromatographic Analysis of Adsorption: Chemisorption and/or Physisorption , 2009 .

[18]  Claes-Göran Granqvist,et al.  Gas sensor response of pure and activated WO3 nanoparticle films made by advanced reactive gas deposition , 2006 .

[19]  Ulrich Banach,et al.  Hydrogen Sensors - A review , 2011 .

[20]  Kengo Shimanoe,et al.  Theory of gas-diffusion controlled sensitivity for thin film semiconductor gas sensor , 2001 .

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

[22]  Soumen Das,et al.  SnO2: A comprehensive review on structures and gas sensors , 2014 .

[23]  Michael Tiemann,et al.  Porous metal oxides as gas sensors. , 2007, Chemistry.

[24]  Jie Hu,et al.  Synthesis of brush-like ZnO nanowires and their enhanced gas-sensing properties , 2016, Journal of Materials Science.

[25]  Sanghoo Park,et al.  Synthesis of one-dimensional SnO2 nanorods via a hydrothermal technique , 2009 .

[26]  Kai Jiang,et al.  From the Surface Reaction Control to Gas-Diffusion Control: The Synthesis of Hierarchical Porous SnO2 Microspheres and Their Gas-Sensing Mechanism , 2015 .

[27]  Fei Ding,et al.  ZnO micro-windbreak for enhanced gas diffusion , 2013 .

[28]  U. Diebold,et al.  Surface studies of gas sensing metal oxides. , 2007, Physical chemistry chemical physics : PCCP.

[29]  Martin Moskovits,et al.  CHEMICAL SENSING AND CATALYSIS BY ONE-DIMENSIONAL METAL-OXIDE NANOSTRUCTURES , 2004 .

[30]  A. Freeman,et al.  Tuning the properties of transparent oxide conductors. Dopant ion size and electronic structure effects on CdO-based transparent conducting oxides. Ga- and in-doped CdO thin films grown by MOCVD , 2008 .

[31]  Haibin Yang,et al.  Synthesis of self-assembled 3D hollow microspheres of SnO2 with an enhanced gas sensing performance , 2013 .

[32]  S. Hussain,et al.  Hydrothermal synthesis of hierarchical SnO2 nanostructures made of superfine nanorods for smart gas sensor , 2016 .

[33]  Teng Fei,et al.  Synthesis and ethanol sensing properties of SnO2 nanosheets via a simple hydrothermal route , 2012 .

[34]  Jian Wang,et al.  Preparation of NiO two-dimensional grainy films and their high-performance gas sensors for ammonia detection , 2015, Nanoscale Research Letters.

[35]  Tengfei Li,et al.  Template-free synthesis of highly ethanol-response hollow SnO2 spheres using hydrothermal process , 2015, Journal of Materials Science: Materials in Electronics.

[36]  Dong Xiang,et al.  Metal Oxide Gas Sensors: Sensitivity and Influencing Factors , 2010, Sensors.

[37]  Thorsten Wagner,et al.  Mesoporous materials as gas sensors. , 2013, Chemical Society reviews.

[38]  W. Gőpel.  Chemisorption and charge transfer at ionic semiconductor surfaces: Implications in designing gas sensors , 1985 .

[39]  S. Barth,et al.  One-Dimensional Semiconductor Nanostructures: Growth, Characterization and Device Applications , 2008 .

[40]  J. Shim,et al.  Preparation of porous SnO2 microcubes and their enhanced gas-sensing property , 2015 .

[41]  S. Hussain,et al.  Controlled synthesis of SnO2 hierarchical architectures made of ultrathin nanoflakes for enhanced ethanol gas sensing properties , 2015 .

[42]  Rujia Zou,et al.  Ethanol gas sensor based on a self-supporting hierarchical SnO2 nanorods array , 2015 .

[43]  J. H. Lee,et al.  Gas sensors using hierarchical and hollow oxide nanostructures: Overview , 2009 .

[44]  A. Rogach,et al.  Hierarchical SnO2 Nanostructures: Recent Advances in Design, Synthesis, and Applications , 2014 .