The Effects of Residual Chlorides on Gas Sensing Characteristics of Tin Oxide Gas Sensors

1991 ◽  
Vol 138 (7) ◽  
pp. 2185-2189 ◽  
Author(s):  
Y. M. Son ◽  
H. B. Kwon ◽  
E. W. Roberts
Keyword(s):  
Gas Sensors ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Sensing Characteristics

scholarly journals Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE)

2017 ◽  
Vol 8 ◽  
pp. 522-529 ◽  
Author(s):  
Daniel Fischer ◽  
Andreas Hertwig ◽  
Uwe Beck ◽  
Volkmar Lohse ◽  
Detlef Negendank ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Gas Sensors ◽  
Tin Oxide ◽  
Plasmon Resonance ◽  
Binding Sites ◽  
Gas Sensing ◽  
Iron Doping ◽  
Actual Surface ◽  
Gas Measurement

Background: Gas sensors are very important in several fields like gas monitoring, safety and environmental applications. In this approach, a new gas sensing concept is investigated which combines the powerful adsorption probability of metal oxide conductive sensors (MOS) with an optical ellipsometric readout. This concept shows promising results to solve the problems of cross sensitivity of the MOS concept. Results: Undoped tin oxide (SnOx) and iron doped tin oxide (Fe:SnOx) thin add-on films were prepared by magnetron sputtering on the top of the actual surface plasmon resonance (SPR) sensing gold layer. The films were tested for their sensitivity to several gas species in the surface plasmon resonance enhanced (SPREE) gas measurement. It was found that the undoped tin oxide (SnOx) shows higher sensitivities to propane (C3H8) then to carbon monoxide (CO). By using Fe:SnOx, this relation is inverted. This behavior was explained by a change of the amount of binding sites for CO in the layer due to this iron doping. For hydrogen (H2) no such relation was found but the sensing ability was identical for both layer materials. This observation was related to a different sensing mechanism for H2 which is driven by the diffusion into the layer instead of adsorption on the surface. Conclusion: The gas sensing selectivity can be enhanced by tuning the properties of the thin film overcoating. A relation of the binding sites in the doped and undoped SnOx films and the gas sensing abilities for CO and C3H8 was found. This could open the path for optimized gas sensing devices with different coated SPREE sensors.

Time-dependent oxygen vacancy distribution and gas sensing characteristics of tin oxide gas sensitive thin films

2010 ◽  
Vol 150 (1) ◽  
pp. 330-338 ◽  
Author(s):  
Jianqiao Liu ◽  
Shuping Gong ◽  
Qiuyun Fu ◽  
Yi Wang ◽  
Lin Quan ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Vacancy ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Time Dependent ◽  
Vacancy Distribution ◽  
Sensing Characteristics

Micromachined Array Studies of Tin Oxide Films: Nucleation, Structure and Gas Sensing Characteristics

1999 ◽  
Vol 574 ◽  
Author(s):  
B. Panchapakesan ◽  
D. L. DeVoe ◽  
R. E. Cavicchi ◽  
R. M. Walton ◽  
S. Semancik
Keyword(s):  
Gas Sensors ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Environmental Safety ◽  
Fine Tuning ◽  
Seeded Growth ◽  
Gaseous Species ◽  
Low Concentrations ◽  
Oxide Deposition ◽  
Materials Research

AbstractThe ability to fabricate sensitive and stable gas sensors which can detect low concentrations of gaseous species is necessary for many critical applications such as environmental safety monitoring. Although highly sensitive gas sensors have been produced by dispersion of catalytic metals on oxide sensing films, fouling of catalysts can cause instability in sensor performance. We have examined an approach which involves fine tuning the microstructure of tin oxide sensing films by vapor depositing an ultra-thin film of seed layer metals prior to tin oxide deposition. Metals including Fe, Sn and Pt have been investigated for their influence on tin oxide growth. Systematic studies of the growth mechanism and microstructure of CVD tin oxide using four-element arrays of “microhotplates” have revealed a number of different film morphologies which result from seeding. Enhancements in sensitivity for seeded growth relative to unseeded growth suggest a method of producing sensitive gas sensors which may not require the addition of surface catalytic layers. In this study we also demonstrate the use of microhotplates not only as sensing devices, but as excellent platforms for materials research.

Spay Pyrolyzed Nanostructured Tin Dioxide Thin Films Doped by Cobalt: Correlation between Structural and Gas Sensing Characteristics

2013 ◽  
Vol 377 ◽  
pp. 180-185
Author(s):  
Ghenadii Korotcenkov ◽  
Iulia Boris ◽  
Vladimir Brinzari ◽  
Beongki Cho
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Structural Properties ◽  
Gas Sensors ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
Co Doping ◽  
Low Levels ◽  
Sensing Characteristics ◽  
Operation Characteristics

Effect of Co-doping on gas sensing, electrophysical and structural properties of the SnO2films deposited by spray pyrolysis has been studied. It is found that the influence of Co-doping on parameters of the SnO2-based gas sensors depends on the concentration of doping additives and could be accompanied by either improvement of sensor parameters at low levels of doping (CCo< 2-4 %) or degradation of the gas sensor operation characteristics while the concentration of additives exceeds 2-4%. An explanation of observed effects is given.

Gas sensing characteristics of tin oxide whiskers

1986 ◽  
Vol 9 (2) ◽  
pp. 147-155 ◽  
Author(s):  
M. Egashira ◽  
Y. Yoshida ◽  
S. Kawasumi
Keyword(s):  
Tin Oxide ◽  
Gas Sensing ◽  
Sensing Characteristics

scholarly journals Investigation of the Carbon Monoxide Gas Sensing Characteristics of Tin Oxide Mixed Cerium Oxide Thin Films

Sensors ◽  
2012 ◽  
Vol 12 (3) ◽  
pp. 2598-2609 ◽  
Author(s):  
Sardar M. A. Durrani ◽  
Mohammad F. Al-Kuhaili ◽  
Imran A. Bakhtiari ◽  
Muhammad B. Haider
Keyword(s):  
Thin Films ◽  
Carbon Monoxide ◽  
Cerium Oxide ◽  
Tin Oxide ◽  
Gas Sensing ◽  
Oxide Thin Films ◽  
Sensing Characteristics
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