A review of low-temperature H2S gas sensors: fabrication and mechanism

2021 ◽  
Author(s):  
Sara Ghaderahmadi ◽  
Milad Kamkar ◽  
Nishat Tasnim ◽  
Mohammad Arjmand ◽  
Mina Hoorfar
Keyword(s):  
Low Temperature ◽  
Power Consumption ◽  
Chemical Modification ◽  
Gas Sensors ◽  
Operating Temperature ◽  
Lower Power ◽  
Long Term Stability ◽  
Hazardous Gases ◽  
Physical And Chemical

Reduced detection temperature of hazardous gases such as H2S can lower power consumption and increase the long-term stability. The decreased operating temperature can be achieved via physical and chemical modification of the sensing layer.

scholarly journals CO Detection Investigation at High Temperature by SiC MISFET Metal/Oxide Gas Sensors

Proceedings ◽  
2021 ◽  
Vol 56 (1) ◽  
pp. 41
Author(s):  
Lida Khajavizadeh ◽  
Anita Lloyd Spetz ◽  
Mike Andersson
Keyword(s):  
High Temperature ◽  
Gas Sensors ◽  
Elevated Temperatures ◽  
Long Term Stability ◽  
Stability Performance ◽  
Catalytic Metal ◽  
Co Detection ◽  
Effect Transistor ◽  
Metal Oxide Gas Sensors

In order to investigate the necessary device improvements for high-temperature CO sensing with SiC metal insulator semiconductor field effect transistor (MISFET)-based chemical gas sensors, devices employing, as the gas-sensitive gate contact, a film of co-deposited Pt/Al2O3 instead of the commonly used catalytic metal-based contacts were fabricated and characterized for CO detection at elevated temperatures and different CO and O2 levels. It can be concluded that the sensing mechanism at elevated temperatures correlates with oxygen removal from the sensor surface rather than the surface CO coverage as observed at lower temperatures. The long-term stability performance was also shown to be improved compared to that of previously studied devices.

Novel quaternary oxide semiconductor for the application of gas sensors with long-term stability

2021 ◽  
Author(s):  
Chong Wang ◽  
Yiqun Zhang ◽  
Lianjing Zhao ◽  
Chenguang Wang ◽  
Fangmeng Liu ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Oxide Semiconductor ◽  
Term Stability ◽  
Long Term Stability

Synthesis, Structural and Gas Sensing Characterization of W-Doped SnO2 Nanostructures

2017 ◽  
Vol 381 ◽  
pp. 15-19 ◽  
Author(s):  
Mukesh Chander Bhatnagar ◽  
Anima Johari
Keyword(s):  
Low Temperature ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Environmental Pollutants ◽  
Sensor Response ◽  
Gas Content ◽  
Temperature Sensitive ◽  
Oxide Material ◽  
Industry Waste

Tin oxide material has been extensively used for gas sensing application. Due to high operating temperature of metal oxide gas sensors, around 600 K and long term instability, research has been carried out to improve the material properties and reducing operating temperature. nanostructure materials have shown higher sensitivity and better stability towards gas environment. Air pollutants from automobiles and industry waste are the primary sources of environmental pollutants and there is need to develop low temperature, sensitive and selective gas sensors to monitor the gas content. In this paper, we have discussed the effect of Tungsten (W) doping in SnO2 nanostructures on the structural and gas sensing properties. The nanostructures have been synthesized by thermal evaporation process. The structural and surface morphology studies confirm the growth of nanowires on silicon substrates. The corresponding EDX spectra also confirm the doping of W into SnO2 nanowires. The gas sensor response of W-doped SnO2 nanowires was investigated upon exposure to various gases. It has been observed that doping of W enhances the NO2 sensitivity of nanowire based sensors at low temperature and the sensor response improves with increase in gas concentration.

scholarly journals NO2 and NH3 Sensing Characteristics of Inkjet Printing Graphene Gas Sensors

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3379 ◽  
Author(s):  
Caterina Travan ◽  
Alexander Bergmann
Keyword(s):  
Gas Sensors ◽  
Inkjet Printing ◽  
High Mobility ◽  
High Sensitivity ◽  
Low Noise ◽  
Manufacturing Method ◽  
Long Term Stability ◽  
Wide Range ◽  
Ideal Technique

Graphene is a good candidate for filling the market requirements for cheap, high sensitivity, robust towards contamination, low noise, and low power consumption gas sensors, thanks to its unique properties, i.e., large surface, high mobility, and long-term stability. Inkjet printing is a cheap additive manufacturing method allowing fast, relatively precise and contactless deposition of a wide range of materials; it can be considered therefore the ideal technique for fast deposition of graphene films on thin substrates. In this paper, the sensitivity of graphene-based chemiresistor gas sensors, fabricated through inkjet printing, is investigated using different concentrations of graphene in the inks. Samples have been produced and characterized in terms of response towards humidity, nitrogen dioxide, and ammonia. The presented results highlight the importance of tuning the layer thickness and achieving good film homogeneity in order to maximize the sensitivity of the sensor.

Enhancing catalytic activity and stability for CO2 methanation on Ni@MOF-5 via control of active species dispersion

2015 ◽  
Vol 51 (9) ◽  
pp. 1728-1731 ◽  
Author(s):  
Wenlong Zhen ◽  
Bo Li ◽  
Gongxuan Lu ◽  
Jiantai Ma
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
High Stability ◽  
Active Catalyst ◽  
Active Species ◽  
Co2 Methanation ◽  
Long Term Stability ◽  
Uniform State ◽  
Highly Dispersed

A novel high active catalyst Ni@MOF-5 showed unexpected higher activity under the low temperature for CO2 methanation. The characterization results indicated that Ni was in highly dispersed uniform state over MOF-5. This catalyst performed high stability and showed almost no deactivation in long term stability tests up to 100 h.

scholarly journals Cementation of Bioproducts Generated from Biodegradation of Radioactive Cellulosic-Based Waste Simulates by Mushroom

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
S. B. Eskander ◽  
S. M. Abd El-Aziz ◽  
H. El-Sayaad ◽  
H. M. Saleh
Keyword(s):  
Radioactive Waste ◽  
Portland Cement ◽  
Current Work ◽  
Waste Form ◽  
Pleurotus Pulmonarius ◽  
Long Term Stability ◽  
Surrounding Environment ◽  
Solidified Waste ◽  
Physical And Chemical

The current work was devoted to study the solidification of bioproducts originated from the bioremediation of mixture of solid cellulose-based radioactive waste simulates using a mushroom (Pleurotus pulmonarius), in Portland cement. The obtained solidified waste form was subjected to mechanical integrity qualification after curing periods of 28 and 90 days. Chemical performance of the cement-waste form was also evaluated in different leachant media during 540 days. The results obtained gave useful information about the mechanical, physical, and chemical performances of the final cement-waste form incorporated the radioactive bioproducts. Moreover, it indicated that cement can provide a highly durable form that ensures a long-term stability of the solidified waste material and can act as a first barrier against the release of radiocontaminants from radioactive wastes to the surrounding environment.

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