Characteristic responses of a semiconductor gas sensor depending on the frequency of a periodic temperature change

Nakata, Satoshi; Okunishi, Hirokazu

doi:10.1016/j.apsusc.2004.07.005

Cited by 16 publications

(10 citation statements)

References 30 publications

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“…1,11 So far, several solutions have been proposed to palliate this situation, such as ͑1͒ using selective absorbing filters that minimize the exposure of the sensors to interfering gases, [12][13][14] ͑2͒ adding catalytic additives intended to maximize their response to specific target species, 8,15,16 ͑3͒ using arrays formed by different sensors with different sensitivities and later processing the experimental data by means of pattern recognition algorithms, [17][18][19][20][21] or even ͑4͒ periodically modulating the devices' operating temperature to modify the selectivity of the metal oxides toward gases as much as possible. [22][23][24][25][26][27] Although the first two solutions yield moderate, yet insufficient, improvement, they make the sensor manufacturing and material synthesis more difficult, and eventually more expensive. The third one needs more than only one sensor to be integrated in the system.…”

mentioning

confidence: 99%

Quantitative analysis of CO-humidity gas mixtures with self-heated nanowires operated in pulsed mode

Prades

Hernández-Ramírez

Fischer

et al. 2010

Applied Physics Letters

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Self-heating effect in individual metal oxide nanowires can be used to activate their response to gases with power consumptions below tenths of microwatts. The thermal response time of these devices is extremely fast (a few milliseconds) and it makes it possible to observe the kinetics of the interactions between the gas molecules and the metal oxide. In this work we demonstrate that such effects enable an experimental methodology to improve the selectivity of metal oxide-based sensors based on the analysis of their fast response dynamics. Specifically, this work jointly analyzes the magnitude and response time of SnO2 nanowire-based sensors to carbon monoxide (CO) and humidity (H2O) mixtures, proving that a quantitative analysis of CO–H2O gas blends can be achieved by modulating their work temperature through the self-heating effect.

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mentioning

confidence: 99%

Quantitative analysis of CO-humidity gas mixtures with self-heated nanowires operated in pulsed mode

Prades

Hernández-Ramírez

Fischer

et al. 2010

Applied Physics Letters

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“…The observed differences in the sensor output signal let to distinguish between carbon monoxide, air and ethanol. Nakata at all in case to improve the selectivity of semiconductor gas sensors has used a sinusoidal signal with 0.02 Hz, 0.04 Hz and 0.08 Hz [9] (Fig. 4).…”

Section: Temperature Modulationmentioning

confidence: 99%

Methods of selectivity improvements of semiconductor gas sensors

Halek

Malewicz

Teterycz

2009

2009 International Students and Young Scientists Workshop "Photonics and Microsystems"

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In this paper, methods for selectivity improvement of semiconductor gas sensors are presented. The frequently used techniques are: temperature modulation, synthesis of new materials, designing new sensor constructions, adopting filter layers and using of sensors array. A comparison between the different methods has been made. It was concluded that the kind of sensing material and filter layer have a strong influence on the sensor parameters. The analysis has shown that the optimal detection temperature change when using multilayer gas sensors.

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“…Because of increasing concern over safety and health hazards presented by exposure to amine vapours, the major challenge is to find an effective and reliable way for monitoring amine levels and to detect the exposure to potentially hazardous amine concentrations in the workplace environment. A number of reports are available on odour sensors using metal oxides (SnO 2 , TiO 2 , WO 2 ) based sensors, but they require relatively high operational temperatures (100–500 °C) 7–9.…”

Section: Introductionmentioning

confidence: 99%

Room temperature detection of amine vapours using copper phthalocyanine based thin films

Saini¹,

Mahajan²,

Bedi³

et al. 2012

Physica Status Solidi (a)

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In this paper, we report the preparation and characterization of 50 nm thin film of non‐peripherally substituted copper(II)1,4,8,11,15,18,22,25‐octabutoxy‐29H,31H‐phthalocyanine (nCuPc(OBu)8) using spin coating technique for room temperature sensing of different primary amines namely methylamine, butylamine and octylamine, respectively. AFM studies of film reveal that film is porous, uniform and crack free. The rms roughness and average pore size of film is found to be 24 and 430 nm, respectively. The adsorption of analytes on film surface is consistent with Elovich equation. The response of the film towards different amines is related to the vapour temperature and chain length of amine molecules. The film shows better response for methylamine vapours at room temperature 25 °C.

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Characteristic responses of a semiconductor gas sensor depending on the frequency of a periodic temperature change

Cited by 16 publications

References 30 publications

Quantitative analysis of CO-humidity gas mixtures with self-heated nanowires operated in pulsed mode

Quantitative analysis of CO-humidity gas mixtures with self-heated nanowires operated in pulsed mode

Methods of selectivity improvements of semiconductor gas sensors

Room temperature detection of amine vapours using copper phthalocyanine based thin films

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