Chemical Vapor Deposition of Cu2O and CuO nanosystems for innovative gas sensors

2009 ◽  
Author(s):  
Elisabetta Comini ◽  
Giorgio Sberveglieri ◽  
Davide Barreca ◽  
Cinzia Sada ◽  
Alberto Gasparotto ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Chemical Vapor

H2S Gas Sensor Based on WO3 Nanostructures Synthesized via Aerosol Assisted Chemical Vapor Deposition Technique

2019 ◽  
Vol 11 (9) ◽  
pp. 1247-1256 ◽  
Author(s):  
T. Shujah ◽  
M. Ikram ◽  
A. R. Butt ◽  
M. K. Shahzad ◽  
K. Rashid ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Desorption Kinetics ◽  
Nanostructured Surfaces ◽  
Vapor Deposition Technique ◽  
H2s Gas Sensor ◽  
Adsorption Desorption

Herein we demonstrate tungsten oxide (WO3 nanostructures based resistive type sensors for hydrogen sulfide (H2S) gas sensing utility. The WO3 dynamic layers have been deposited upon alumina substrates pre-patterned with gold (Au) interdigitated electrodes. For comparative study, two distinct WO3 nanostructures (S-425 and S-450) have been synthesized using Aerosol Assisted Chemical Vapor Deposition (AACVD) technique at varied deposition temperatures i.e., 425 and 450 °C, respectively. The gas detecting properties of both sensors were investigated against varied concentration (0-60 ppm) of H2S gas levels. The electrical resistance of fabricated gas detectors has been observed at DC bias of 5 V and low operating temperature 250 °C. Specifically, when concentration of H2S gas increases from 0-10 ppm, average resistance of the S-425 and S-450 gas sensors was observed to decrease by 96.5% and 97.6%, respectively. In general, the sensing mechanism of gas sensors proposed in this work can be associated with ionosorption of oxygen species over WO3 nanostructured surfaces. However, the significantly enhanced sensing performance of S-450 sensor may be attributed to improved crystallinity in its structure and improved ions adsorption/desorption kinetics at nanorods surface morphology.

Plasma-enhanced chemical vapor deposition carbon nanotubes for ethanol gas sensors

2009 ◽  
Vol 18 (2-3) ◽  
pp. 472-477 ◽  
Author(s):  
Chia-Te Hu ◽  
Chun-Kuo Liu ◽  
Meng-Wen Huang ◽  
Sen-Hong Syue ◽  
Jyh-Ming Wu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Chemical Vapor

scholarly journals Study on the gas sensitivity of vanadium-doped molybdenum disulfide to mustard gas

2020 ◽  
Vol 204 ◽  
pp. 01003
Author(s):  
Huaizhang Wang ◽  
Yangyang Wang ◽  
Pengbo Chi ◽  
Huaning Jiang ◽  
Jingfei Chen ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Chemical Vapor Deposition ◽  
Nitrogen Dioxide ◽  
Band Gap ◽  
Molybdenum Disulfide ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Mustard Gas ◽  
Gas Sensitivity

As a graphene-like material, molybdenum disulfide has similar properties to graphene, but due to its excellent properties such as adjustable band gap, molybdenum disulfide has a broader application in many aspects (such as gas sensors). With the deepening of research, molybdenum disulfide cannot fully meet the needs of researchers due to defects and other reasons. Therefore, researches on doping and compounding of molybdenum disulfide have gradually attracted attention. At present, most of the research on gas sensitivity has focused on harmful gases (such as nitrogen dioxide, ammonia and carbon monoxide, etc.). There are few studies on the erosive chemical toxic mustard gas. In this paper, vanadium-doped molybdenum disulfide were prepared based on chemical vapor deposition, and the gas-sensitive response of vanadium-doped molybdenum disulfide to mustard gas was studied.

scholarly journals Comparison of SnBr4 and di-n-butyl tin diacetate as laser-assisted chemical vapor deposition precursors for SnO2-based gas sensors

1998 ◽  
Vol 12 (3) ◽  
pp. 147-154 ◽  
Author(s):  
Jeanne M. Hossenlopp ◽  
F. J. Lamelas ◽  
Kenneth Middleton ◽  
Jeffrey A. Rzepiela ◽  
Jason D. Schmidt ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Chemical Vapor

Gas Sensing Properties of Columnar CeO2 Nanostructures Prepared by Chemical Vapor Deposition

2008 ◽  
Vol 8 (2) ◽  
pp. 1012-1016 ◽  
Author(s):  
Davide Barreca ◽  
Elisabetta Comini ◽  
Alberto Gasparotto ◽  
Chiara Maccato ◽  
Cinzia Maragno ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Gas Sensing ◽  
Chemical Vapor ◽  
Operating Conditions ◽  
Working Temperature ◽  
Gas Sensing Properties ◽  
Resistive Gas Sensors ◽  
Higher Sensitivity

Columnar CeO2 nanostructures are grown on alumina substrates by a template- and catalyst-free Chemical Vapor Deposition (CVD) approach and subsequently tested as resistive gas sensors of CH3COCH3, H2, NO2. The sensor response is stable and reproducible throughout the whole working temperature range (200–500 °C) and directly dependent on the analyte gas and the adopted operating conditions. The higher sensitivity with respect to that displayed by continuous CeO2 thin films demonstrates the potential of fabricating nanostructured sensing devices characterized by improved functional performances.

Chemical vapor deposition of copper oxide films and entangled quasi-1D nanoarchitectures as innovative gas sensors

2009 ◽  
Vol 141 (1) ◽  
pp. 270-275 ◽  
Author(s):  
D. Barreca ◽  
E. Comini ◽  
A. Gasparotto ◽  
C. Maccato ◽  
C. Sada ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Copper Oxide ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Oxide Films ◽  
Chemical Vapor

Highly Selective Gas Sensors Based on Graphene Nanoribbons Grown by Chemical Vapor Deposition

2020 ◽  
Vol 12 (6) ◽  
pp. 7392-7402 ◽  
Author(s):  
Mikhail Shekhirev ◽  
Alexey Lipatov ◽  
Angel Torres ◽  
Nataliia S. Vorobeva ◽  
Ashley Harkleroad ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Graphene Nanoribbons ◽  
Chemical Vapor

scholarly journals The Enhanced H2 Selectivity of SnO2 Gas Sensors with the Deposited SiO2 Filters on Surface of the Sensors

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2478 ◽  
Author(s):  
Xin Meng ◽  
Qinyi Zhang ◽  
Shunping Zhang ◽  
Ze He
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Sensors ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Experimental Results ◽  
Variation Coefficient ◽  
Maximum Response ◽  
Response Variation ◽  
Sensing Performance ◽  
H2 Selectivity

This paper reports a study on the enhanced H2 selectivity of SnO2 gas sensors with SiO2 on the surface of the sensors obtained via chemical vapor deposition using dirthoxydimethylsilane as the Si source. The gas sensors were tested for sensing performance towards ethanol, acetone, benzene, and hydrogen at operating temperatures from 150 °C to 400 °C. Our experimental results show that higher selectivity and responses to hydrogen were achieved by the deposition of SiO2 on the surface of the sensors. The sensor with SiO2 deposited on its surface at 500 °C for 8 h exhibited the highest response (Ra/Rg = 144) to 1000 ppm hydrogen at 350 °C, and the sensor with SiO2 deposited on its surface at 600 °C for 4 h attained the maximum response variation coefficient (D = 69.4) to 1000 ppm hydrogen at 200 °C. The mechanism underlying the improvement in sensitivity and the higher responses to hydrogen in the sensors with SiO2 on their surface is also discussed.

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