Pt-decorated hierarchical SiC nanofibers constructed by intertwined SiC nanorods for high-temperature ammonia gas sensing

2019 ◽  
Vol 7 (24) ◽  
pp. 7299-7307 ◽  
Author(s):  
Nan Wu ◽  
Bing Wang ◽  
Cheng Han ◽  
Qiong Tian ◽  
Chunzhi Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Recovery Time ◽  
Gas Sensing ◽  
Fast Response ◽  
Ammonia Gas ◽  
Response Recovery

Hierarchical Pt/HSiC nanofibers exhibited a fast response/recovery time of 2 s/5 s towards 500 ppm NH3 at 500 °C.

scholarly journals Improvement in NO2 Gas Sensing Properties of Semiconductor-Type Sensors by Loading Pt into BiVO4 Nanocomposites at Room Temperature

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5913
Author(s):  
Wang-De Lin ◽  
Shu-Yun Lin ◽  
Murthy Chavali
Keyword(s):  
Recovery Time ◽  
Gas Sensing ◽  
Fast Response ◽  
X Ray Diffraction ◽  
X Ray ◽  
Response Recovery ◽  
Transmission Electron ◽  
Surface Morphologies ◽  
Sensing Characteristics ◽  
Semiconductor Type

In the present study, we report the first attempt to prepare a conducive environment for Pt/BiVO4 nanocomposite material reusability for the promotion of sustainable development. Here, the Pt/BiVO4 nanocomposite was prepared using a hydrothermal method with various weight percentages of platinum for use in NO2 gas sensors. The surface morphologies and structure of the Pt/BiVO4 nanocomposite were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The results showed that Pt added to BiVO4 with 3 wt.% Pt/BiVO4 was best at a concentration of 100 ppm NO2, with a response at 167.7, and a response/recovery time of 12/35 s, respectively. The Pt/BiVO4 nanocomposite-based gas sensor exhibits promising nitrogen dioxide gas-sensing characteristics, such as fast response, highly selective detection, and extremely short response/recovery time. Additionally, the mechanisms of gas sensing in Pt/BiVO4 nanocomposites were explored in this paper.

scholarly journals Nanostructured ZnO/Ag Film Prepared by Magnetron Sputtering Method for Fast Response of Ammonia Gas Detection

Molecules ◽  
2020 ◽  
Vol 25 (8) ◽  
pp. 1899 ◽  
Author(s):  
Yiran Zheng ◽  
Min Li ◽  
Xiaoyan Wen ◽  
Ho-Pui Ho ◽  
Haifei Lu
Keyword(s):  
Magnetron Sputtering ◽  
Thermal Annealing ◽  
Physical Vapor Deposition ◽  
Gas Sensing ◽  
Volume Ratio ◽  
Fast Response ◽  
Gas Detection ◽  
Zno Films ◽  
Zno Film ◽  
Ammonia Gas

Possessing a large surface-to-volume ratio is significant to the sensitive gas detection of semiconductor nanostructures. Here, we propose a fast-response ammonia gas sensor based on porous nanostructured zinc oxide (ZnO) film, which is fabricated through physical vapor deposition and subsequent thermal annealing. In general, an extremely thin silver (Ag) layer (1, 3, 5 nm) and a 100 nm ZnO film are sequentially deposited on the SiO2/Si substrate by a magnetron sputtering method. The porous nanostructure of ZnO film is formed after thermal annealing contributed by the diffusion of Ag among ZnO crystal grains and the expansion of the ZnO film. Different thicknesses of the Ag layer help the formation of different sizes and quantities of hollows uniformly distributed in the ZnO film, which is demonstrated to hold superior gas sensing abilities than the compact ZnO film. The responses of the different porous ZnO films were also investigated in the ammonia concentration range of 10 to 300 ppm. Experimental results demonstrate that the ZnO/Ag(3 nm) sensor possesses a good electrical resistance variation of 85.74% after exposing the sample to 300 ppm ammonia gas for 310 s. Interestingly, a fast response of 61.18% in 60 s for 300 ppm ammonia gas has been achieved from the ZnO/Ag(5 nm) sensor, which costs only 6 s for the response increase to 10%. Therefore, this controllable, porous, nanostructured ZnO film maintaining a sensitive gas response, fabricated by the physical deposition approach, will be of great interest to the gas-sensing community.

scholarly journals Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yingying Jian ◽  
Wenwen Hu ◽  
Zhenhuan Zhao ◽  
Pengfei Cheng ◽  
Hossam Haick ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Carrier Transport ◽  
Gas Sensing ◽  
Low Cost ◽  
Functional Materials ◽  
Fast Response ◽  
Hybrid Functional ◽  
Great Stability ◽  
Molecular Binding ◽  
Response Recovery

AbstractChemi-resistive sensors based on hybrid functional materials are promising candidates for gas sensing with high responsivity, good selectivity, fast response/recovery, great stability/repeatability, room-working temperature, low cost, and easy-to-fabricate, for versatile applications. This progress report reviews the advantages and advances of these sensing structures compared with the single constituent, according to five main sensing forms: manipulating/constructing heterojunctions, catalytic reaction, charge transfer, charge carrier transport, molecular binding/sieving, and their combinations. Promises and challenges of the advances of each form are presented and discussed. Critical thinking and ideas regarding the orientation of the development of hybrid material-based gas sensor in the future are discussed.

Using Palladium Nanocubes on ZnO Nanostructures in Hydrogen Gas Sensor for Fast Response and Recovery Time

2021 ◽  
Vol 21 (4) ◽  
pp. 2495-2499
Author(s):  
Hoang Si Hong ◽  
Tran Vinh Hoang
Keyword(s):  
Gas Sensor ◽  
Recovery Time ◽  
Fast Response ◽  
Hydrogen Gas ◽  
Zno Nanostructures ◽  
Response Recovery ◽  
Sensor Structure ◽  
Recovery Times ◽  
Response And Recovery ◽  
Robust Sensing

We developed a novel sensor structure by synthesizing Pd nanocubes (NCs) decorated on ZnO nanostructures (NSs) applied to resistive-type H2 gas sensor with micro-length in sensing channel. The ZnO NSs were selectively grown between micro-size finger-like interdigital electrodes through microelectromechanical technology. The novel H2 sensor structure with the sensing channel was reduced to micro-size by this proposed method to obtain a sensor with fast response/recovery time. The as-prepared structure exhibited robust sensing performance with a response of 11% at optimal temperature of 150 °C, good linearity, and fast response/recovery time within 10 s. The speed of chemisorption through the diffusion pathway in Pd NCs combined with micro-length in sensing channel in sensor showed fast response and recovery times of 9 and 15 s, respectively, toward 10,000 ppm (1%) H2 at 150 °C. The result showed approximate linearity response in H2 concentration range of 5÷10,000 ppm and a large operating temperature range from room temperature to 200 °C.

Solvothermal synthesis of ZnO-decorated α-Fe2O3 nanorods with highly enhanced gas-sensing performance toward n-butanol

2014 ◽  
Vol 2 (33) ◽  
pp. 13283-13292 ◽  
Author(s):  
Yusuf V. Kaneti ◽  
Quadir M. D. Zakaria ◽  
Zhengjie Zhang ◽  
Chuyang Chen ◽  
Jeffrey Yue ◽  
...  
Keyword(s):  
Solvothermal Synthesis ◽  
Gas Sensing ◽  
Solvothermal Method ◽  
Fast Response ◽  
Working Temperature ◽  
Enhanced Sensitivity ◽  
Response Recovery ◽  
Facile Solvothermal Method ◽  
Sensing Performance

A facile solvothermal method has been developed for the synthesis of α-Fe2O3/ZnO nanocomposites that show enhanced sensitivity, selectivity and fast response–recovery toward n-butanol at a working temperature of 225 °C.

Y-doped In2O3 hollow nanocubes for improved triethylamine-sensing performance

2021 ◽  
Vol 45 (15) ◽  
pp. 6773-6779
Author(s):  
Qi Zhao ◽  
Guoce Zhuang ◽  
Yongbing Zhao ◽  
Liangliang Yang ◽  
Jinshan Zhao
Keyword(s):  
Gas Sensing ◽  
Fast Response ◽  
High Response ◽  
Sensing Properties ◽  
Response Recovery ◽  
Gas Sensing Properties ◽  
Sensing Performance

Y-In2O3 hollow nanocubes show enhanced triethylamine gas sensing properties, with a high response and an ultra-fast response-recovery speed.

Au-sensitized WO3 nanoparticles synthesized and their enhanced acetone sensing properties

2018 ◽  
Vol 11 (04) ◽  
pp. 1850071 ◽  
Author(s):  
Dongping Xue ◽  
Zhanying Zhang
Keyword(s):  
Recovery Time ◽  
Gas Sensing ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Properties ◽  
Response Recovery ◽  
Two Samples ◽  
Gas Sensing Properties ◽  
Scanning Electron

Au-sensitized WO3 nanoparticles have been synthesized by a facile two-step hydrothermal method. The structures, morphologies and surface compositions of the materials were characterized by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The test results show that we have prepared higher purity Au-sensitized WO3 nanoparticles. The gas-sensing properties of pure and Au-sensitized WO3 nanoparticles on acetone vapor were further investigated. The results obtained show that the response-recovery time of the two samples prepared is relatively short compared to that reported in the current literature. The Au-sensitized WO3 nanoparticles are significantly more sensitive and selective than the pure WO3 nanoparticles. This may be mainly attributed to the synergy between Au and WO3. It is expected that the Au-sensitized WO3 nanoparticles thus prepared can also be used for research in other fields.

Hierarchical Flower-Like Microspheres: An Application of Hydrogen Sulfide Gas Sensor for Tunnel Construction

2021 ◽  
Vol 16 (1) ◽  
pp. 1-5
Author(s):  
Chuansheng Wu ◽  
Yuyue Li ◽  
Lingling Qi ◽  
Lingjiang Zhang ◽  
Hao Xu
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Fast Response ◽  
Tunnel Construction ◽  
Hydrothermal Route ◽  
Sensing Properties ◽  
Response Recovery ◽  
Gas Sensing Properties ◽  
Gas Response ◽  
Scanning Electron

Hierarchical flower-like WO3 · H2O microspheres assembled by nanosheets were successfully prepared through a simple hydrothermal route. Field emission scanning electron microscopy results indicate that the flower-like WO3 · H2O microspheres are composed of numerous nanosheets, which are interconnected with each other in the sphere shape. In addition, the gas sensing properties of the hierarchical WO3 · H2O microspheres were investigated. It is found that the gas sensor based on the hierarchical WO3 · H2O architectures exhibits excellent gas sensing properties towards H2S gas, including high gas response and fast response/recovery speed.

scholarly journals Probing the highly efficient room temperature ammonia gas sensing properties of a luminescent ZnO nanowire array prepared via an AAO-assisted template route

2014 ◽  
Vol 43 (15) ◽  
pp. 5713-5720 ◽  
Author(s):  
Nagesh Kumar ◽  
A. K. Srivastava ◽  
R. Nath ◽  
Bipin Kumar Gupta ◽  
G. D. Varma
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Nanowire Array ◽  
Fast Response ◽  
Zno Nanowire ◽  
Ammonia Gas ◽  
Sensing Properties ◽  
Highly Efficient ◽  
Gas Sensing Properties

A highly ordered luminescent ZnO nanowire array was synthesized which has excellent sensitivity and fast response to NH3 gas.

TiO2(B) nanoparticle-functionalized WO3nanorods with enhanced gas sensing properties

2014 ◽  
Vol 16 (22) ◽  
pp. 10830-10836 ◽  
Author(s):  
Hongxin Zhang ◽  
Shurong Wang ◽  
Yanshuang Wang ◽  
Jiedi Yang ◽  
Xueling Gao ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Fast Response ◽  
Good Stability ◽  
Good Reproducibility ◽  
Sensing Properties ◽  
Response Recovery ◽  
Gas Sensing Properties ◽  
Organic Gases

TiO2(B)–WO3nanorods exhibited fast response–recovery speeds, good reproducibility and good stability to several organic gases, indicating promising applications in gas sensing.

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