scholarly journals Nucleation density and pore size tunable growth of ZnO nanowalls by a facile solution approach: growth mechanism and NO2 gas sensing properties

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3319-3328 ◽  
Author(s):  
Chun Li ◽  
Lingmin Yu ◽  
Xinhui Fan ◽  
Mingli Yin ◽  
Ning Nan ◽  
...  
Keyword(s):  
Pore Size ◽  
Growth Mechanism ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Nucleation Density ◽  
Porous Network ◽  
Sensing Properties ◽  
Solution Approach ◽  
Gas Sensing Properties ◽  
Network Morphology

Nanowalls are novel nanostructures whose 3D porous network morphology holds great potential for applications as gas sensors.

scholarly journals Gas Sensing Properties of Mg-Incorporated Metal–Organic Frameworks

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3323 ◽  
Author(s):  
Jae-Hyoung Lee ◽  
Thanh-Binh Nguyen ◽  
Duy-Khoi Nguyen ◽  
Jae-Hun Kim ◽  
Jin-Young Kim ◽  
...  
Keyword(s):  
Pore Size ◽  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
Kinetic Properties ◽  
Sensing Properties ◽  
Sensing Applications ◽  
Gas Sensing Properties ◽  
Metal Organic

The gas sensing properties of two novel series of Mg-incorporated metal–organic frameworks (MOFs), termed Mg-MOFs-I and -II, were assessed. The synthesized iso-reticular type Mg-MOFs exhibited good crystallinity, high thermal stability, needle-shape morphology and high surface area (up to 2900 m2·g−1), which are promising for gas sensing applications. Gas-sensing studies of gas sensors fabricated from Mg-MOFs-II revealed better sensing performance, in terms of the sensor dynamics and sensor response, at an optimal operating temperature of 200 °C. The MOF gas sensor with a larger pore size and volume showed shorter response and recovery times, demonstrating the importance of the pore size and volume on the kinetic properties of MOF-based gas sensors. The gas-sensing results obtained in this study highlight the potential of Mg-MOFs gas sensors for the practical monitoring of toxic gases in a range of environments.

scholarly journals Fabrication ofTiO2Nanotube Thin Films and Their Gas Sensing Properties

2009 ◽  
Vol 2009 ◽  
pp. 1-19 ◽  
Author(s):  
Yongxiang Li ◽  
Xiaofeng Yu ◽  
Qunbao Yang
Keyword(s):  
Thin Films ◽  
Growth Mechanism ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Nanotube Arrays ◽  
Barrier Layer Thickness ◽  
Current Time ◽  
Sensing Properties ◽  
Gas Sensing Properties

The fabrication process and the growth mechanism of titanium/titania nanotubes prepared by anodization process is reviewed, and their applications in the fields of dye sensitized solar cells, photocatalysts, electrochromic devices, gas sensors, and biomaterials are presented. The anodization of Ti thin films on different substrates and the growth process of anodic titanium oxide are described using the current-time curves. Special attention is paid on the influences of the initial film smoothness on the resulted nanoporous morphologies. The “threshold barrier layer thickness model” is used to discuss the growth mechanism. As a case study for gas sensing, anodized highly orderedTiO2nanotube arrays and nanoporous thin films that show porous surface with an average diameter of 25 nm and interpore distance of 40 nm were prepared. Gas sensors based on such nanotube arrays and nanoporous thin films were fabricated, and their sensing properties were investigated. ExcellentH2gas sensing properties were obtained for sensors prepared from these highly orderedTiO2nanotube arrays, which present stable response even at a low operating temperature of90°C. Based on our experimental results, “H-inducedO2−desorption” mechanism was used for explaining the hydrogen gas sensing mechanism.

The effect of Nb doping on hydrogen gas sensing properties of capacitor-like Pt/Nb-TiO2/Pt hydrogen gas sensors

2019 ◽  
Vol 806 ◽  
pp. 1052-1059 ◽  
Author(s):  
Zhong Li ◽  
ZhengJun Yao ◽  
Azhar Ali Haidry ◽  
Tomas Plecenik ◽  
Branislav Grancic ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrogen Gas ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Hydrogen Gas Sensors ◽  
Nb Doping

scholarly journals NOx Gas Sensing Properties and Mechanism of ZnO-Based Varistor-Type Gas Sensors

1999 ◽  
Vol 119 (2) ◽  
pp. 103-107 ◽  
Author(s):  
Takeo Hyodo ◽  
Keiko Okamoto ◽  
Yuji Takao ◽  
Yasuhiro Shimizu ◽  
Makoto Egashira
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties

New Insight into Gas Sensing Properties of SnO2 and Cu2o/CuO Based Gas Sensors By Near Ambient Pressure XPS

2020 ◽  
Vol MA2020-01 (28) ◽  
pp. 2114-2114
Author(s):  
Mykhailo Vorokhta ◽  
Pavel Hozak ◽  
Ivan Khalakhan ◽  
Martin Vrnata ◽  
Ján Lančok ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Ambient Pressure ◽  
Sensing Properties ◽  
Ambient Pressure Xps ◽  
Gas Sensing Properties ◽  
Insight Into ◽  
Near Ambient Pressure Xps

scholarly journals Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 785 ◽  
Author(s):  
Wen-Dong Zhou ◽  
Davoud Dastan ◽  
Jing Li ◽  
Xi-Tao Yin ◽  
Qi Wang
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Sol Gel ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Type Response ◽  
Properties Of Composites

Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H2, so it is difficult for these gas sensors to distinguish the two gases. In this paper, simple sol–gel method was employed to obtain the ZnO–xNiO composites. Gas sensing performance results illustrated that the gas sensing properties of composites with x > 0.425 showed a p-type response to both CO and H2, while the gas sensing properties of composites with x < 0.425 showed an n-type response to both CO and H2. However, it was interesting that ZnO–0.425NiO showed a p-type response to CO but an discriminable response (n-type) to H2, which indicated that modulating the p-type or n-type semiconductor concentration in p-n composites could be an effective method with which to improve the discriminability of this type of gas sensor regarding CO and H2. The phenomenon of the special gas sensing behavior of ZnO–0.425NiO was explained based on the experimental observations and a range of characterization techniques, including XRD, HRTEM and XPS, in detail.

On the Role of Oxygen Vacancies in the Determination of the Gas-Sensing Properties of Tin-Oxide Nanowires

2006 ◽  
Vol 915 ◽  
Author(s):  
Roberto Mosca ◽  
Mingzheng Zha ◽  
Davide Calestani ◽  
Laura Lazzarini ◽  
Giancarlo Salviati ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Oxygen Vacancies ◽  
Gas Sensing ◽  
Oxide Nanowires ◽  
Sensing Properties ◽  
Sno2 Nanowires ◽  
Gas Sensing Properties ◽  
First Results ◽  
Depth Study

AbstractSnO2 nanowires have been recently employed in the “gas-sensors” field and excellent results of conductometric and optical tests on SnO2 nanowires-based gas sensors have been reported.However, the mechanism that controls the gas-sensing effect in metal oxides nanowires is not fully understood yet. Here the authors present the first results of an in-depth study about the influence of post growth treatments on the physical and gas sensing properties of SnO2 nanowires.In particular, SnO2 nanowires grown by a vapour transport technique were annealed in a oxygen-rich atmosphere and then characterized by different techniques to assess the influence of the treatment on the nanowires properties.The annealing in oxygen atmosphere is shown to strongly affect the PL and CL spectra, the electrical resistivity as well as the gas sensing properties of the nanowires. The obtained results are consistent with a reduction of the oxygen vacancies concentration induced by the O2 treatment and seem to confirm the role of these defects in affecting the gas response of SnO2 nanowires-based sensors.

Hierarchically designed ZnO nanostructure based high performance gas sensors

RSC Advances ◽  
2014 ◽  
Vol 4 (90) ◽  
pp. 49521-49528 ◽  
Author(s):  
Mohammad R. Alenezi ◽  
T. H. Alzanki ◽  
A. M. Almeshal ◽  
A. S. Alshammari ◽  
M. J. Beliatis ◽  
...  
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
High Surface ◽  
Hierarchical Nanostructures ◽  
Sensing Properties ◽  
Zno Nanostructure ◽  
Gas Sensing Properties

Enhanced gas sensing properties of ZnO were achieved by designing hierarchical nanostructures with high surface-to-volume ratios and more exposed polar facets.

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