scholarly journals Approaches to Enhancing Gas Sensing Properties: A Review

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1495 ◽  
Author(s):  
Zhenyu Yuan ◽  
Rui Li ◽  
Fanli Meng ◽  
Junjie Zhang ◽  
Kaiyuan Zuo ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Material Science ◽  
Gas Sensing ◽  
Electrical Signal ◽  
Noble Metal Nanoparticles ◽  
Species Concentration ◽  
Operation Temperature ◽  
Gas Sensing Properties ◽  
2D Nanomaterials ◽  
High Operation Temperature

A gas nanosensor is an instrument that converts the information of an unknown gas (species, concentration, etc.) into other signals (for example, an electrical signal) according to certain principles, combining detection principles, material science, and processing technology. As an effective application for detecting a large number of dangerous gases, gas nanosensors have attracted extensive interest. However, their development and application are restricted because of issues such as a low response, poor selectivity, and high operation temperature, etc. To tackle these issues, various measures have been studied and will be introduced in this review, mainly including controlling the nanostructure, doping with 2D nanomaterials, decorating with noble metal nanoparticles, and forming the heterojunction. In every section, recent advances and typical research, as well mechanisms, will also be demonstrated.

scholarly journals Hydrophobic Noble Metal Nanoparticles: Synthesis, Characterization and Perspectives as Gas Sensing Materials

2015 ◽  
Vol 120 ◽  
pp. 781-786 ◽  
Author(s):  
A. Bearzotti ◽  
L. Fontana ◽  
I. Fratoddi ◽  
I. Venditti ◽  
G. Testa ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Gas Sensing ◽  
Noble Metal Nanoparticles ◽  
Nanoparticles Synthesis

Attachment of Metal Nanoparticles to SnO2 Nanowires for Enhancement of Gas Sensing Properties

2014 ◽  
Vol 14 (11) ◽  
pp. 8242-8247
Author(s):  
Hyoun Woo Kim ◽  
Yong Jung Kwon ◽  
Hong Yeon Cho ◽  
Han Gil Na
Keyword(s):  
Metal Nanoparticles ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties

NH3 Sensing Performance of Pt-Doped WO3·0.33H2O Microshuttles Induced From Scheelite Leaching Solution

2020 ◽  
Author(s):  
Tingting Li ◽  
Pengfei Zhou ◽  
Sikai Zhao ◽  
Cong Han ◽  
Dezhou Wei ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Hexagonal Structure ◽  
Raw Material ◽  
Noble Metal Nanoparticles ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Leaching Solution ◽  
One Step ◽  
Sensing Performance ◽  
Operating Temperature Range

Abstract WO3·0.33H2O microshuttles (WMSs) self-assembled by numerous nanorods along the same direction were prepared based on a cheap tungsten-containing metallurgical raw material by combination processes of NaOH leaching and one-step hydrothermal method. The microstructures and gas sensing properties of various concentrations (0, 0.7, 1.0, and 1.3 mol%) of Pt-doped WMSs were investigated to improve their performance. The microstructural characterizations demonstrated that the WMSs assembled by one-dimensional WO3·0.33H2O nanorods were approximately 0.8−1.9 µm in diameter. Such nanorods exhibited a single hexagonal structure with their diameters ranging from 17 to 62 nm. The gas sensing properties indicated that Pt-doped WMSs showed superior gas sensing performance in terms of the sensor response and NH3 selectivity in the operating temperature range of 25−225 oC as compared with pure one, and simultaneously Pt doping could significantly reduce the detection limit of NH3. Especially, 1.0 mol% Pt-doped WMSs exhibited highest response of 28.2 to 1000 ppm NH3 at 175 oC, which was 4 times higher than pure one at 50 oC. The remarkably enhanced gas sensing performance of Pt-doped WMSs to NH3 could be ascribed to the electronic and chemical sensitization mechanisms of noble metal nanoparticles.

scholarly journals Two-Dimensional Nanomaterials for Gas Sensing Applications: The Role of Theoretical Calculations

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 851 ◽  
Author(s):  
Yamei Zeng ◽  
Shiwei Lin ◽  
Ding Gu ◽  
Xiaogan Li
Keyword(s):  
Electric Fields ◽  
Gas Sensing ◽  
Theoretical Calculations ◽  
High Surface ◽  
Volume Ratio ◽  
Two Dimensional ◽  
Sensing Properties ◽  
Sensing Applications ◽  
Gas Sensing Properties ◽  
2D Nanomaterials

Two-dimensional (2D) nanomaterials have attracted a large amount of attention regarding gas sensing applications, because of their high surface-to-volume ratio and unique chemical or physical gas adsorption capabilities. As an important research method, theoretical calculations have been massively applied in predicting the potentially excellent gas sensing properties of these 2D nanomaterials. In this review, we discuss the contributions of theoretical calculations in the study of the gas sensing properties of 2D nanomaterials. Firstly, we elaborate on the gas sensing mechanisms of 2D layered nanomaterials, such as the traditional charge transfer mechanism, and a standard for distinguishing between physical and chemical adsorption, from the perspective of theoretical calculations. Then, we describe how to conduct a theoretical analysis to explain or predict the gas sensing properties of 2D nanomaterials. Thirdly, we discuss three important methods that have been applied in order to improve the gas sensing properties, that is, defect functionalization (vacancy, edge, grain boundary, and doping), heterojunctions, and electric fields. Among these strategies, theoretical calculations play a very important role in explaining the mechanisms underlying the enhanced gas sensing properties. Finally, we summarize both the advantages and limitations of the theoretical calculations, and present perspectives for further research on the 2D nanomaterials-based gas sensors.

Exploring the potential of electroless and electroplated noble metal–semiconductor hybrids within bio- and environmental sensing

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5646-5669 ◽  
Author(s):  
D. Semenova ◽  
K. V. Gernaey ◽  
Y. E. Silina
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Gas Sensing ◽  
Noble Metal Nanoparticles ◽  
Semiconductor Surfaces ◽  
Environmental Sensing ◽  
Preparation Stage

This manuscript provides an elaborate review on galvanic noble metal nanoparticles deposited onto semiconductor surfaces, from the preparation stage towards their application in biosensors and gas sensing.

Schottky diodes based on 2D materials for environmental gas monitoring: a review on emerging trends, recent developments and future perspectives

2021 ◽  
Author(s):  
Minu Mathew ◽  
Chandra Sekhar Rout
Keyword(s):  
Gas Sensing ◽  
2D Materials ◽  
Schottky Diodes ◽  
High Sensitivity ◽  
Future Perspectives ◽  
Working Temperature ◽  
Emerging Trends ◽  
Gas Sensing Properties ◽  
Recent Developments ◽  
Sensitivity And Selectivity

This review details the fundamentals, working principles and recent developments of Schottky junctions based on 2D materials to emphasize their improved gas sensing properties including low working temperature, high sensitivity, and selectivity.

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