Sensing Properties of Diode-Type Gas Sensors

2016 ◽  
Vol 99 ◽  
pp. 61-65
Author(s):  
Yasuhiro Shimizu ◽  
Takeo Hyodo
Keyword(s):  
Gas Sensors ◽  
Polymer Coating ◽  
Alloy Electrode ◽  
Sensing Properties ◽  
Pt Alloy

Several approaches to improve H2 sensing properties of TiO2-based diode-types sensors have been investigated. Those include the adoption of a Pd-Pt alloy electrode instead of using a pure Pd electrode, formation of a polymer coating atop the Pd-Pt alloy electrode and an Au coating on the Pd-Pt alloy electrode. The advantages of the using of the Pd-Pt alloy electrode, the polymer or Au coatings are demonstrated.

H2 Sensing Performance of TiO2-Based Diode-Type Sensors

2008 ◽  
Vol 47-50 ◽  
pp. 1510-1513 ◽  
Author(s):  
Yasuhiro Shimizu ◽  
Keiko Sakamoto ◽  
Masaki Nakaoka ◽  
Takeo Hyodo ◽  
Makoto Egashira
Keyword(s):  
Response Time ◽  
Room Temperature ◽  
Alloy Electrode ◽  
Tio2 Films ◽  
Time Stability ◽  
Response Properties ◽  
Sensing Properties ◽  
N2 Atmosphere ◽  
Pt Alloy ◽  
Sensing Performance

H2 sensing properties of anodic TiO2 films equipped with Pd or Pd-Pt alloy electrodes has been investigated in air and in N2 atmosphere at 250°C and room temperature. The use of a Pd-Pt alloy electrode and a Pt paste improved the magnitude of H2 response, response time, stability and pretreatment- and atmosphere-dependent response properties under humid environments.

Improving sensing properties of entangled carbon nanotube-based gas sensors by atmospheric plasma surface treatment

2020 ◽  
Vol 232 ◽  
pp. 111403 ◽  
Author(s):  
Neelakandan M. Santhosh ◽  
Aswathy Vasudevan ◽  
Andrea Jurov ◽  
Anja Korent ◽  
Petr Slobodian ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Surface Treatment ◽  
Gas Sensors ◽  
Atmospheric Plasma ◽  
Plasma Surface ◽  
Sensing Properties ◽  
Plasma Surface Treatment

Effect of substrate on NO2-sensing properties of WO3 thin film gas sensors

2000 ◽  
Vol 375 (1-2) ◽  
pp. 142-146 ◽  
Author(s):  
Dae-Sik Lee ◽  
Ki-Hong Nam ◽  
Duk-Dong Lee
Keyword(s):  
Thin Film ◽  
Gas Sensors ◽  
Sensing Properties

Characteristics and sensing properties of CO gas sensors based on LaCo 1−x Fe x O 3 nanoparticles

2017 ◽  
Vol 303 ◽  
pp. 97-102 ◽  
Author(s):  
Jun-Chao Ding ◽  
Hua-Yao Li ◽  
Tian-Ci Cao ◽  
Ze-Xing Cai ◽  
Xiao-Xue Wang ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Sensing Properties ◽  
Co Gas

scholarly journals Fabrication and H2-Sensing Properties of SnO2 Nanosheet Gas Sensors

ACS Omega ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 14592-14596 ◽  
Author(s):  
Pil Gyu Choi ◽  
Noriya Izu ◽  
Naoto Shirahata ◽  
Yoshitake Masuda
Keyword(s):  
Gas Sensors ◽  
Sensing Properties ◽  
Sno2 Nanosheet

scholarly journals H2 Sensing Properties and Mechanism of Nb2O5 - Bi2O3 Varistor - type Gas Sensors

2000 ◽  
Vol 68 (1) ◽  
pp. 24-31 ◽  
Author(s):  
Takeo HYODO ◽  
Eiichi KANAZAWA ◽  
Yuji TAKAO ◽  
Yasuhiro SHIMIZU ◽  
Makoto EGASHIRA
Keyword(s):  
Gas Sensors ◽  
Sensing Properties

Polyaniline/poly(ε-caprolactone) composite electrospun nanofiber-based gas sensors: optimization of sensing properties by dopants and doping concentration

2014 ◽  
Vol 25 (11) ◽  
pp. 115501 ◽  
Author(s):  
Karen Low ◽  
Nicha Chartuprayoon ◽  
Cristina Echeverria ◽  
Changling Li ◽  
Wayne Bosze ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Doping Concentration ◽  
Electrospun Nanofiber ◽  
Sensing Properties

scholarly journals Enhanced NO2-Sensing Properties of Au-Loaded Porous In2O3 Gas Sensors at Low Operating Temperatures

Chemosensors ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 72
Author(s):  
Taro Ueda ◽  
Inci Boehme ◽  
Takeo Hyodo ◽  
Yasuhiro Shimizu ◽  
Udo Weimar ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Gas Sensors ◽  
Adsorption Mechanism ◽  
Operating Temperature ◽  
Oxide Surface ◽  
Free Electrons ◽  
Sensing Properties ◽  
Semiconductor Gas Sensors ◽  
No2 Adsorption ◽  
Adsorption Desorption

NO2-sensing properties of semiconductor gas sensors using porous In2O3 powders loaded with and without 0.5 wt% Au (Au/In2O3 and In2O3 sensors, respectively) were examined in wet air (70% relative humidity at 25 °C). In addition, the effects of Au loading on the increased NO2 response were discussed on the basis of NO2 adsorption/desorption properties on the oxide surface. The NO2 response of the Au/In2O3 sensor monotonically increased with a decrease in the operating temperature, and the Au/In2O3 sensor showed higher NO2 responses than those of the In2O3 sensor at a temperature of 100 °C or lower. In addition, the response time of the Au/In2O3 sensor was much shorter than that of the In2O3 sensor at 30 °C. The analysis based on the Freundlich adsorption mechanism suggested that the Au loading increased the adsorption strength of NO2 on the In2O3 surface. Moreover, the Au loading was also quite effective in decreasing the baseline resistance of the In2O3 sensor in wet air (i.e., increasing the number of free electrons in the In2O3), which resulted in an increase in the number of negatively charged NO2 species on the In2O3 surface. The Au/In2O3 sensor showed high response to the low concentration of NO2 (ratio of resistance in target gas to that in air: ca. 133 to 0.1 ppm) and excellent NO2 selectivity against CO and ethanol, especially at 100 °C.

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