Temperature drop of semiconductor gas sensor when exposed to reducing gases — simultaneous measurement of changes in sensor temperature and in resistance

Takada, Toru

doi:10.1016/s0925-4005(99)00422-0

Cited by 9 publications

(9 citation statements)

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“…Particle size is very important for photocatalytic activity. It was observed that intensity of major peaks was reduced with Ag doping, attributed to decrease in crystallinity due to generation of defects caused by silver doping in ZnO [42]. There was no indication for presence of AgO and Ag 2 O phase at 2θ value 32.8°.…”

Section: Photocatalysts Characterizationmentioning

confidence: 92%

The excellent photocatalytic performances of silver doped ZnO nanoparticles for hydrogen evolution

2019

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Ag based ZnO photocatalyst materials were prepared by facile, quick and inexpensive combustion method followed by calcinations at 700 °C for 3 h. The resulted nanoparticles were characterized using XRD, UV-Vis DRS, SEM, BET, FTIR, XPS, EDX and PL spectroscopy. The XRD analysis of silver doped ZnO (SZO) nanoparticles confirmed hexagonal wurtzite structure of ZnO with minimum crystal size about 19 nm. The doping of Ag in ZnO crystal lattice successfully suppressed the crystal growth of ZnO nanoparticles evidenced by XRD results. The DRS and PL spectra studies revealed that Ag doped ZnO nanoparticles showed absorption in visible light region and charge recombination was efficiently suppressed respectively. The DRS spectra analysis indicated that photon energy band gap Eg for SZO nanoparticles were in the range of 3.27-3.33 eV and reduced with increase in Ag doping. As a novel photocatalyst, the photocatalytic activity for hydrogen evolution was tested by water splitting using ethanol as sacrificial agent under solar light irradiation. The optimal hydrogen evolution rate 805 µmol h −1 g −1 was shown by 6% SZO photocatalyst. This was nearly 54 times higher hydrogen evolution rate as compared to pure ZnO. The improved photocatalytic activity was attributed to small particle size, plasmon band, charge separation and increased surface area. This report clearly revealed the benefit of using Ag doped ZnO catalyst for higher photocatalytic hydrogen generation.

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Section: Photocatalysts Characterizationmentioning

confidence: 92%

The excellent photocatalytic performances of silver doped ZnO nanoparticles for hydrogen evolution

2019

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“…The temperature drop during the sensing reaction has been proposed Takada 2000). The temperature decrease is caused by a change in the thermal conductivity of the sensors and it is related to the reaction between reducing gases and surface oxygen ad-ions.…”

Section: Table IImentioning

confidence: 99%

Sensors: From biosensors to the electronic nose

García‐González

Aparicio

2002

Grasas y Aceites

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“…3(a) shows the sensor responses upon gas exposure (CO) at exposure and purging intervals of 20 min. The membrane temperature was preset to 300 C. For better analyte discrimination, both the resistive sensor signal and eventual temperature changes (calorimetric signal) should be monitored and evaluated simultaneously [20], [21]. The temperature changes are a consequence of the chemical processes that occur during gas adsorption.…”

Section: Resultsmentioning

confidence: 99%

Transistor heater for microhotplate-based metal-oxide microsensors

Gräf

Müller

Barrettino

et al. 2005

IEEE Electron Device Lett.

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A transistor-type heater is presented, which has been developed to regulate the temperature of microhotplates in industrial CMOS technology. The heating transistor preserves its transistor characteristics up to 350 C and shows almost linear heating characteristics at temperatures higher than 100 C. The temperature can be controlled by adjusting the transistor source/gate voltage. Sensor measurements for CO are presented in two different sensing modes: chemoresistive readout and calorimetric readout by means of monitoring changes in the source/gate voltage which is required to keep the microhotplate temperature at the preset value. The device is part of an approach to monolithically integrate metal-oxide chemical sensors with circuitry.Index Terms-Metal-oxide gas sensor, microhotplate, MOSFET heater.

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Temperature drop of semiconductor gas sensor when exposed to reducing gases — simultaneous measurement of changes in sensor temperature and in resistance

Cited by 9 publications

References 0 publications

The excellent photocatalytic performances of silver doped ZnO nanoparticles for hydrogen evolution

The excellent photocatalytic performances of silver doped ZnO nanoparticles for hydrogen evolution

Sensors: From biosensors to the electronic nose

Transistor heater for microhotplate-based metal-oxide microsensors

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