V2O5 Nanotubes Novel Gas Sensor with High Sensitivity for Ethanol

2009 ◽  
Vol 421-422 ◽  
pp. 328-331 ◽  
Author(s):  
Wei Jin ◽  
Wen Chen ◽  
Bai Tao Dong ◽  
Chun Xia Zhao ◽  
Li Qiang Mai ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrothermal Reaction ◽  
High Sensitivity ◽  
Average Diameter ◽  
Self Assembling ◽  
Gas Sensing Properties ◽  
Vanadium Oxide Nanotubes

Vanadium oxide nanotubes were synthesized via a rheological self-assembling process followed by a hydrothermal reaction. V2O5 gas sensors were fabricated from vanadium oxide nanotubess with an average diameter of around 90 nm and their gas-sensing properties were investigated. It was found that the sensors based on vanadium oxide nanotubes exhibit high responses ethanol gas at 270°C. The results indicate that vanadium oxide nanotube sensors will be promising candidates for practical detectors for ethanol.

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.

scholarly journals Preparation of Flower-Like Cu-WO3Nanostructures and Their Acetone Gas Sensing Performance

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Hao Zhou ◽  
Dong-Yao Xu ◽  
Hai-Qing Zuo ◽  
Wei Liu ◽  
Shuang Lin
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Hydrothermal Process ◽  
High Sensitivity ◽  
Test System ◽  
Static State ◽  
Acetone Concentration ◽  
Detection Range ◽  
Gas Sensing Properties ◽  
Linear Fit

Urchin-like Cu-W18O49and flower-like Cu-WO3structures were successfully synthesized using a hydrothermal process followed by calcination. The synthesized products were characterized using XRD, SEM, and TEM. The results revealed that the as-prepared urchin-like and flower-like samples with monoclinic structures, which were approximately 1 μm and 1-2 μm, respectively, possessed microflower architecture assembled by the nanosheet. In addition, the gas sensing properties of monoclinic-structured Cu-WO3to acetone were measured using a static state gas sensing test system. The sensor based on the flower-like Cu-WO3nanostructures, which were calcined at 600°C, exhibited high sensitivity toward 10 ppm acetone at an optimum temperature of 110°C, and the maximum sensitivity reached 40, which was approximately four times higher than that of urchin-like WO3that was annealed at 300°C. The sensitivity was improved by increasing the acetone concentration. The detection limit was as low as 1 ppm. Using linear fit, the sensor was determined to be sufficiently sensitive to detect acetone in a detection range of 1 to 10 ppm even in the presence of interfering gases, which suggests that this type of sensor has excellent selectivity and has the potential for use in acetone gas sensors in the future.

Metal cations doped vanadium oxide nanotubes: Synthesis, electronic structure, and gas sensing properties

2018 ◽  
Vol 256 ◽  
pp. 1021-1029 ◽  
Author(s):  
Galina S. Zakharova ◽  
Yueli Liu ◽  
Andrey N. Enyashin ◽  
Xue Yang ◽  
Jing Zhou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Vanadium Oxide ◽  
Gas Sensing ◽  
Metal Cations ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Vanadium Oxide Nanotubes

2D/2D/2D Ti3C2Tx@TiO2@MoS2 Heterostructure as Ultrafast and High-sensitivity NO2 Gas Sensor at Room-temperature

2022 ◽  
Author(s):  
Zhuo Liu ◽  
He Lv ◽  
Ying Xie ◽  
Jue Wang ◽  
Jiahui Fan ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
2D Materials ◽  
High Sensitivity ◽  
Two Dimensional ◽  
No2 Gas Sensor ◽  
2D Structure ◽  
Sensing Application

The very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing application that provide new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure...

Gas sensing properties of p-type semiconducting vanadium oxide nanotubes

2012 ◽  
Vol 258 (24) ◽  
pp. 9554-9558 ◽  
Author(s):  
Minglang Yu ◽  
Xueqin Liu ◽  
Yuan Wang ◽  
Youbin Zheng ◽  
Jiawang Zhang ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Vanadium Oxide Nanotubes

Role of vanadium oxide and palladium multiple loading on the sensitivity and recovery kinetics of tin dioxide based gas sensors

RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5169-5176 ◽  
Author(s):  
Koichi Suematsu ◽  
Kazuya Kodama ◽  
Nan Ma ◽  
Masayoshi Yuasa ◽  
Tetsuya Kida ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Gas Sensors ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Multiple Loading ◽  
Kinetics Of

Improving the gas sensing properties by Pd and V2O5 co-loading on the SnO2 attributed to the role of each additive.

Preparation and Gas Sensing Properties of Microrod ZnO Materials

2014 ◽  
Vol 492 ◽  
pp. 297-300
Author(s):  
Liu Fang Yang ◽  
Yu Lin Wang ◽  
Qin Hui Wang
Keyword(s):  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
High Sensitivity ◽  
Raw Material ◽  
Gas Sensing Properties ◽  
Sensitivity And Selectivity ◽  
Static Volumetric Method ◽  
Degree Of Crystallization ◽  
High Degree

Using zinc chloride solution and ammonia (25%) as raw material, with the presence of surfactant (CTAB), the microrod ZnO material was synthesized by the hydrothermal method. The phase composition and microstructure of the prepared ZnO material were characterized with XRD and SEM. The results show that the ZnO material possesses a high degree of crystallization, its diameter below 4 μm, and its length about 35 μm. The gas sensing property of gas sensor fabricated with the prepared ZnO material was evaluated via the static volumetric method. At the operating temperature of 200°C, the gas sensor has high sensitivity and selectivity to CH3COCH3.The gas sensing characterization was also discussed.

scholarly journals Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4263
Author(s):  
Shirui Xue ◽  
Sicheng Cao ◽  
Zhaoling Huang ◽  
Daoguo Yang ◽  
Guoqi Zhang
Keyword(s):  
Gas Sensors ◽  
Agricultural Production ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Sensing Properties ◽  
Advantages And Disadvantages ◽  
Short Recovery Time ◽  
Gas Sensing Properties

In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely. Metal oxide semiconductor (MOS) gas sensors have become an important area of research in the field of gas sensing due to their high sensitivity, quick response time, and short recovery time for NO2, CO2, acetone, etc. In our article, we mainly focus on the gas-sensing properties of MOS gas sensors and summarize the methods that are based on the interface effect of MOS materials and micro–nanostructures to improve their performance. These methods include noble metal modification, doping, and core-shell (C-S) nanostructure. Moreover, we also describe the mechanism of these methods to analyze the advantages and disadvantages of energy barrier modulation and electron transfer for gas adsorption. Finally, we put forward a variety of research ideas based on the above methods to improve the gas-sensing properties. Some perspectives for the development of MOS gas sensors are also discussed.

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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