Improved gas sensing properties of silver-functionalized ZnSnO3 hollow nanocubes

2018 ◽  
Vol 5 (9) ◽  
pp. 2123-2131 ◽  
Author(s):  
YanYang Yin ◽  
Feng Li ◽  
Nan Zhang ◽  
Shengping Ruan ◽  
Haifeng Zhang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Fast Response ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Porous Silver ◽  
Acetone Detection

Porous silver-functionalized ZnSnO3 hollow nanocubes as a gas sensor with an ultra-fast response and recovery speed for acetone detection.

scholarly journals MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1059 ◽  
Author(s):  
Yanlin Zhang ◽  
Chaowei Jia ◽  
Qiuyue Wang ◽  
Quan Kong ◽  
Gang Chen ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Metal Organic Framework ◽  
Fast Response ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Metal Organic ◽  
Response And Recovery ◽  
Nife2o4 Nanoparticles ◽  
Gas Molecules ◽  
Ppm Level

Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.

High Response and Selectivity Methanol Gas Sensor Using Molecular Imprinting Technique

2014 ◽  
Vol 809-810 ◽  
pp. 731-736
Author(s):  
Qin Zhu ◽  
Yu Min Zhang ◽  
Jin Zhang ◽  
Zhong Qi Zhu ◽  
Qing Ju Liu
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
High Response ◽  
Molar Ratio ◽  
Methanol Vapor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Recovery Times ◽  
Response And Recovery ◽  
Infrared Spectrometer

A new gas sensor with high response and selectivity was fabricated by using molecularly imprinted powders (MIPs) which provide special recognition sites to methanol. The MIPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and fourier transform infrared spectrometer (FT-IR), respectively. The gas sensing properties of MIPs to methanol were investigated. The experimental results indicate that the sensors based on the MIPs show excellent gas sensing properties to methanol vapor, and the properties of the sensor with x=6:10 (x= methyl acrylic acid: LaFeO3, molar ratio) are the best. At the optimal operating temperature of 130°C, the response of the sensor (x=6:10) to 1 ppm methanol is 21, and the response and recovery times are 57 s and 67 s, respectively.

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 Fast Response Isopropanol Sensing Properties with Sintered BiFeO3 Nanocrystals

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3829 ◽  
Author(s):  
Hongxiang Xu ◽  
Junhua Xu ◽  
Junlin Wei ◽  
Yamei Zhang
Keyword(s):  
Gas Sensing ◽  
Fast Response ◽  
Gas Detection ◽  
Detection Range ◽  
Sensing Properties ◽  
Working Temperature ◽  
Sensing Material ◽  
Gas Sensing Properties ◽  
Response And Recovery ◽  
Optimum Working

BiFeO3 nanocrystals were applied as the sensing material to isopropanol. The isopropanol sensor based on BiFeO3 nanocrystals shows excellent gas-sensing properties at the optimum working temperature of 240 °C. The sensitivity of as-prepared sensor to 100 ppm isopropanol is 31 and its response and recovery time is as fast as 6 and 17 s. The logarithmic curves of the sensitivity and concentration of BiFeO3 sensors are a very good linear in the low detection range of 2–100 ppm. In addition, the gas sensing mechanism is also discussed. The results suggest that the BiFeO3 nanomaterial can be potentially applied in isopropanol gas detection.

A facile method for preparation of porous nitrogen-doped Ti Ti3C2Tx MXene for highly responsive acetone detection at high temperature

2021 ◽  
pp. 2151043
Author(s):  
Zijing Wang ◽  
Fen Wang ◽  
Angga Hermawan ◽  
Jianfeng Zhu ◽  
Shu Yin
Keyword(s):  
Gas Sensor ◽  
Recovery Time ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Gas Sensitivity ◽  
Nitrogen Doped ◽  
Dimensional Network ◽  
Potential Applications ◽  
Response And Recovery ◽  
Acetone Detection

Porous nitrogen-doped Ti3C2T[Formula: see text] MXene (N-TCT) with a three-dimensional network structure is synthesized via a simple sacrifice template method and then utilized as an acetone gas sensor. By introducing nitrogen atoms as heteroatoms into Ti3C2T[Formula: see text] nanosheets, some defects generate around the doped nitrogen atoms, which can greatly improve the surface hydrophilicity and adsorption capacity of Ti3C2T[Formula: see text] Mxene nanosheets. It resulted in the enhanced gas sensitivity, achieving a response value of about 36 ([Formula: see text]/[Formula: see text] × 100%) and excellent recovery time (9s) at 150[Formula: see text]C. Compared with the pure Ti3C2T[Formula: see text]-based gas sensor (381/92s), the response and recovery time are both obviously improved, and the response value increased by 3.5 times. The gas-sensing mechanism of the porous N-TCT is also discussed in detail. Based on the excellent gas sensitivity of porous N-TCT for highly responsive acetone detection at high temperatures, the strategy of nitrogen-doped two-dimensional nanomaterials can be extended to other nanomaterials to realize their potential applications.

scholarly journals Preparation of Nanostructured SnO2-NiO Composite Semiconductor for Gas Sensor Applications

2021 ◽  
pp. 391-403
Author(s):  
S. Kumar ◽  
P. Gowthaman ◽  
J. Deenathayalan
Keyword(s):  
Gas Sensor ◽  
Composite Nanofibers ◽  
Volume Fraction ◽  
Gas Sensing ◽  
Precipitation Method ◽  
Response Sensitivity ◽  
X Ray ◽  
Sensing Properties ◽  
Working Temperature ◽  
Gas Sensing Properties

Electro spinning technology combined with chemical precipitation method and high-temperature calcination was used to prepare SnO2-NiO composite semiconductor nanofibers with different Sn content. Scanning electron microscope (SEM), X-ray diffractometer (XRD) and energy dispersive X-ray spectrometer (EDS) were used to characterize the morphology, structure and content of various elements of the sample. Using ethanol as the target gas, the gas sensing properties of SnO2-NiO nanofibers and the influence of Sn content on the gas sensing properties of composite nanofibers were explored. The research results show that SnO2-NiO composite nanofibers have a three-dimensional network structure, and the SnO2 composite can significantly enhance the gas sensitivity of NiO nanofibers. With increase of SnO2 content, the response sensitivity of composite fibers to ethanol gas increases, and the response sensitivity of composite nanofibers with the highest response to ethanol gas with a volume fraction of 100×10-6 at the optimal working temperature of 160℃ are13.4;It is 8.38 times the maximum response sensitivity of NiO nanofibers. Compared with the common ethanol gas sensor MQ-3 on the market, SnO2-NiO composite nanofibers have a lower optimal working temperature and higher response sensitivity, which has certain practical application value

Optimization and gas sensing properties of Au nanoparticle modified α-Fe2O3 nanodisk structures for highly sensitive acetone detection

2020 ◽  
Vol 44 (37) ◽  
pp. 16174-16184
Author(s):  
Haoyue Yang ◽  
Rui Zhou ◽  
Yongjiao Sun ◽  
Pengwei Li ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Hydrothermal Method ◽  
Gas Sensing ◽  
Au Nanoparticle ◽  
Facile Hydrothermal Method ◽  
Sensing Properties ◽  
Highly Sensitive ◽  
Gas Sensing Properties ◽  
Acetone Detection

Au nanoparticle (Au NP) modified α-Fe2O3 nanodisk structures are obtained using a facile hydrothermal method and annealing based surface treatment.

UV enhanced NO gas sensing properties of the MoS2 monolayer gas sensor

2019 ◽  
Vol 6 (8) ◽  
pp. 085075 ◽  
Author(s):  
S Ramu ◽  
T Chandrakalavathi ◽  
G Murali ◽  
K Sunil Kumar ◽  
A Sudharani ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Mos2 Monolayer ◽  
Gas Sensing Properties

Gas‐Sensing Properties of Th / SnO2 Thin‐Film Gas Sensor to Trimethylamine

1999 ◽  
Vol 146 (9) ◽  
pp. 3536-3537 ◽  
Author(s):  
P. H. Wei ◽  
G. B. Li ◽  
S. Y. Zhao ◽  
L. R. Chen
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Sno2 Thin Film ◽  
Sensing Properties ◽  
Gas Sensing Properties
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