Highly Sensitive Ammonia Sensors Based on Ag-Decorated WO3 Nanorods

In this paper, WO<sub>3</sub> nanorods are successfully synthesized via a one-step hydrothermal method, and then, silver nanoparticles are deposited on the WO<sub>3</sub> surface by <italic>in situ</italic> photoreduction method to obtain Ag/WO<sub>3</sub> gas sensitive materials. WO<sub>3</sub> and Ag/WO<sub>3</sub> are characterized by scanning electron microscope techniques, transmission electron microscope, and X-ray diffraction. The experimental results indicated that Ag nanoparticles have an important effect on the gas response of WO<sub>3</sub>. The Ag/WO <sub>3</sub> sensor greatly improves the selectivity and response compared to the traditional WO<sub>3</sub> sensor; the response is 300 for 100 ppm ammonia when the Ag/WO<sub>3</sub> sensor operates at the optimum operating temperature. The Ag/WO<sub>3</sub> sensor can respond to 50 ppb ammonia.

[1]  Minqiang Li,et al.  Trimethylamine Sensors Based on Au-Modified Hierarchical Porous Single-Crystalline ZnO Nanosheets , 2017, Sensors.

[2]  Cheng Liang Hsu,et al.  High sensitivity of a ZnO nanowire-based ammonia gas sensor with Pt nano-particles , 2010, Nano Commun. Networks.

[3]  Dongzhi Zhang,et al.  Quantitative detection of formaldehyde and ammonia gas via metal oxide-modified graphene-based sensor array combining with neural network model , 2017 .

[4]  Fanli Meng,et al.  Sub-ppb detection of acetone using Au-modified flower-like hierarchical ZnO structures , 2015 .

[5]  Athanasios Katsoyiannis,et al.  Exposure to major volatile organic compounds and carbonyls in European indoor environments and associated health risk. , 2011, Environment international.

[6]  C. Zhang,et al.  Room temperature responses of visible-light illuminated WO3 sensors to NO2 in sub-ppm range , 2013 .

[7]  Wen-Chau Liu,et al.  Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration , 2015 .

[8]  Hao Wu,et al.  Ag-decorated ultra-thin porous single-crystalline ZnO nanosheets prepared by sunlight induced solvent reduction and their highly sensitive detection of ethanol , 2015 .

[9]  Mohamad Hijazi,et al.  Ambient temperature selective ammonia gas sensor based on SnO 2 -APTES modifications , 2018 .

[10]  Sunghoon Park,et al.  Enhanced CO gas sensing properties of Pt-functionalized WO3 nanorods , 2012 .

[11]  Xin Guo,et al.  Hierarchical flowerlike WO3 nanostructures assembled by porous nanoflakes for enhanced NO gas sensing , 2017 .

[12]  Jinhuai Liu,et al.  UV-activated room temperature single-sheet ZnO gas sensor , 2017 .

[13]  Zhanhai Yang,et al.  High‐Oriented Polypyrrole Nanotubes for Next‐Generation Gas Sensor , 2016, Advanced materials.

[14]  Marta Schuhmacher,et al.  Human health risks of formaldehyde indoor levels: An issue of concern , 2016, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[15]  H Zhao,et al.  A novel coral-shaped Dy2O3 gas sensor for high sensitivity NH3 detection at room temperature , 2018 .

[16]  Wei Ma,et al.  Triple-shelled ZnO/ZnFe2O4 heterojunctional hollow microspheres derived from Prussian Blue analogue as high-performance acetone sensors , 2018 .

[17]  Yun Chan Kang,et al.  Highly sensitive and selective detection of ppb-level NO2 using multi-shelled WO3 yolk–shell spheres , 2016 .

[18]  Oliver G. Schmidt,et al.  Rolled-up SnO2 nanomembranes: A new platform for efficient gas sensors , 2018, Sensors and Actuators B: Chemical.

[19]  Jinhuai Liu,et al.  Highly sensitive and selective butanol sensors using the intermediate state nanocomposites converted from β-FeOOH to α-Fe2O3 , 2018, Sensors and Actuators B: Chemical.

[20]  Yong Zhao,et al.  One-Step Synthesis of Au/SnO2/RGO Nanocomposites and Their VOC Sensing Properties , 2018, IEEE Transactions on Nanotechnology.

[21]  Gas sensing characteristics of Fe-doped tungsten oxide thin films , 2012 .

[22]  Dongzhi Zhang,et al.  Layer-by-Layer Self-assembly of Co3O4 Nanorod-Decorated MoS2 Nanosheet-Based Nanocomposite toward High-Performance Ammonia Detection. , 2017, ACS applied materials & interfaces.

[23]  Qianqian Liu,et al.  Selective Deposition of Silver Nanoparticles onto WO3 Nanorods with Different Facets: The Correlation of Facet-Induced Electron Transport Preference and Photocatalytic Activity , 2016 .

[24]  Ming Zhao,et al.  Synthesis of hemispherical WO3/graphene nanocomposite by a microwave-assisted hydrothermal method and the gas-sensing properties to triethylamine , 2015 .

[25]  P. T. Moseley,et al.  Progress in the development of semiconducting metal oxide gas sensors: a review , 2017 .

[26]  Wen Chen,et al.  ppb level ammonia detection of 3-D PbS quantum dots/reduced graphene oxide nanococoons at room temperature and Schottky barrier modulated behavior , 2018 .

[27]  Jiran Liang,et al.  Preparation of porous silicon/Pd-loaded WO 3 nanowires for enhancement of ammonia sensing properties at room temperature , 2018, Materials Science in Semiconductor Processing.

[28]  Wen-Chau Liu,et al.  Ammonia sensing characteristic of a Pt nanoparticle/aluminum-doped zinc oxide sensor , 2018, Sensors and Actuators B: Chemical.

[29]  R. Sankar Ganesh,et al.  Sensitivity enhancement of ammonia gas sensor based on Ag/ZnO flower and nanoellipsoids at low temperature , 2018 .

[30]  Yanghai Gui,et al.  Synthesis of flower-like WO3/graphene nanocomposite by microwave-assisted hydrothermal method and the enhanced gas-sensing properties to aniline , 2016, Journal of Materials Science: Materials in Electronics.

[31]  Hanqing Yu,et al.  Ammonia sensing by closely packed WO3 microspheres with oxygen vacancies. , 2018, Chemosphere.

[32]  Fanli Meng,et al.  Low-temperature formaldehyde gas sensors based on NiO-SnO2 heterojunction microflowers assembled by thin porous nanosheets , 2018, Sensors and Actuators B: Chemical.

[33]  Dongzhi Zhang,et al.  Room-temperature high-performance ammonia gas sensor based on layer-by-layer self-assembled molybdenum disulfide/zinc oxide nanocomposite film , 2017 .

[34]  P. Li,et al.  Facile fabrication of polyaniline/multi-walled carbon nanotubes/molybdenum disulfide ternary nanocomposite and its high-performance ammonia-sensing at room temperature , 2018 .