High-performance gas sensor based on ZnO nanowires functionalized by Au nanoparticles

Abstract One-dimensional (1D) semiconductor nanostructure has been widely used for gas sensor devices. In this work, a high performance gas sensor based on Au-functionalized ZnO nanorods was fabricated. Au nanoparticles were successfully immobilized onto the surface of ZnO nanorods to serve as a sensitizer by a facile solution reduction process. The hybrid Au/ZnO nanorods have been systematically characterized by XRD, SEM, EDS, TEM and optical absorption spectrum. Gas sensing tests reveal that the Au/ZnO sensor has remarkably enhanced performance compared to pure ZnO. It could detect ethanol gas in a wide concentration range with very high response, fast response–recovery time, good selectivity and stable repeatability. The possible sensing mechanism is discussed. The superior sensing features indicate the present Au/ZnO nanorods are promising for gas sensors.

[1]  Dianzeng Jia,et al.  Low-heating solid-state synthesis and excellent gas-sensing properties of α-Fe2O3 nanoparticles , 2013 .

[2]  Yu Hang Leung,et al.  Optical properties of ZnO nanostructures. , 2006, Small.

[3]  Gyu-Tae Kim,et al.  Synthesis and gas sensing characteristics of highly crystalline ZnO–SnO2 core–shell nanowires , 2010 .

[4]  Yiying Wu,et al.  Room-Temperature Ultraviolet Nanowire Nanolasers , 2001, Science.

[5]  M. Hon,et al.  Influence of Size and Density of Au Nanoparticles on ZnO Nanorod Arrays for Sensing Reducing Gases , 2013 .

[6]  Lili Wang,et al.  Templating synthesis of ZnO hollow nanospheres loaded with Au nanoparticles and their enhanced gas sensing properties , 2012 .

[7]  Wei Wang,et al.  Enhanced acetone sensing performance of Au nanoparticles functionalized flower-like ZnO , 2012 .

[8]  Jing Guo,et al.  Reactive-template fabrication of porous SnO2 nanotubes and their remarkable gas-sensing performance. , 2013, ACS applied materials & interfaces.

[9]  Huijuan Zhang,et al.  Morphology-controlled synthesis of SnO(2) nanotubes by using 1D silica mesostructures as sacrificial templates and their applications in lithium-ion batteries. , 2010, Small.

[10]  T. Abdallah,et al.  Shape and size dependence of the surface plasmon resonance of gold nanoparticles studied by Photoacoustic technique , 2008 .

[11]  Dalin Sun,et al.  The properties of ethanol gas sensor based on Ti doped ZnO nanotetrapods , 2010 .

[12]  Bingqiang Cao,et al.  Three-dimensional SnO2 microstructures assembled by porous nanosheets and their superior performance for gas sensing , 2013 .

[13]  Wei Xu,et al.  Facile synthesis of ZnO nanorod arrays and hierarchical nanostructures for photocatalysis and gas sensor applications. , 2011, Journal of hazardous materials.

[14]  A. Cornet,et al.  Strategies to enhance the carbon monoxide sensitivity of tin oxide thin films , 2003 .

[15]  Oh Seok Kwon,et al.  WO3 nanonodule-decorated hybrid carbon nanofibers for NO2 gas sensor application , 2013 .

[16]  Xianghong Liu,et al.  Au-Functionalized Hematite Hybrid Nanospindles: General Synthesis, Gas Sensing and Catalytic Properties , 2011 .

[17]  Jun Zhang,et al.  3D hierarchically porous ZnO structures and their functionalization by Au nanoparticles for gas sensors , 2011 .

[18]  Ki-Bum Kim,et al.  Structural and Electrical Properties of Atomic Layer Deposited Al‐Doped ZnO Films , 2011 .

[19]  Xingfu Zhou,et al.  Construction of hollow and mesoporous ZnO microsphere: a facile synthesis and sensing property. , 2012, ACS applied materials & interfaces.

[20]  Bin Liu,et al.  Hydrothermal synthesis of ZnO nanorods in the diameter regime of 50 nm. , 2003, Journal of the American Chemical Society.

[21]  Peidong Yang,et al.  Nanowire dye-sensitized solar cells , 2005, Nature materials.

[22]  Dmitri O. Klenov,et al.  Enhanced gas sensing by individual SnO2 nanowires and nanobelts functionalized with Pd catalyst particles. , 2005, Nano letters.

[23]  G. Lu,et al.  Gas sensing with hollow α-Fe2O3 urchin-like spheres prepared via template-free hydrothermal synthesis , 2012 .

[24]  Zheng Lou,et al.  Encapsuled nanoreactors (Au@SnO₂): a new sensing material for chemical sensors. , 2013, Nanoscale.

[25]  Jun Zhang,et al.  Amino acid-assisted one-pot assembly of Au, Pt nanoparticles onto one-dimensional ZnO microrods. , 2010, Nanoscale.

[26]  H. Fan,et al.  Fast economical synthesis of Fe-doped ZnO hierarchical nanostructures and their high gas-sensing performance , 2013 .

[27]  Xianghong Liu,et al.  One-pot synthesis of Au-supported ZnO nanoplates with enhanced gas sensor performance , 2012 .

[28]  Hao He,et al.  Ethanol sensing properties of porous ZnO spheres via hydrothermal route , 2013, Journal of Materials Science.

[29]  Le-Xi Zhang,et al.  Large-scale synthesis of flower-like ZnO nanorods via a wet-chemical route and the defect-enhanced ethanol-sensing properties , 2013 .

[30]  Xiaojing Hu,et al.  A Au-functionalized ZnO nanowire gas sensor for detection of benzene and toluene. , 2013, Physical chemistry chemical physics : PCCP.

[31]  Yujin Chen,et al.  Ethanol sensing characteristics of ambient temperature sonochemically synthesized ZnO nanotubes , 2008 .

[32]  Lei Jiang,et al.  Fabrication and characterization of superhydrophobic Sb2O3 films , 2008, Nanotechnology.

[33]  Taihong Wang,et al.  Rapid and ultrahigh ethanol sensing based on Au-coated ZnO nanorods , 2008, Nanotechnology.

[34]  H. Fan,et al.  Room-temperature solid state synthesis of ZnO/α-Fe2O3 hierarchical nanostructures and their enhanced gas-sensing properties , 2012 .

[35]  Giorgio Sberveglieri,et al.  Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts , 2002 .

[36]  Heon-Jin Choi,et al.  Controlled growth of ZnO nanowires and their optical properties , 2002 .

[37]  S. Choopun,et al.  Ethanol sensor based on ZnO and Au-doped ZnO nanowires , 2008 .

[38]  Lay Gaik Teoh,et al.  ZnO:Al Thin Film Gas Sensor for Detection of Ethanol Vapor , 2006, Sensors (Basel, Switzerland).

[39]  D. K. Aswal,et al.  Ethanol sensing properties of pure and Au modified ZnO nanowires , 2013 .