A fast and sensitive catalytic gas sensors for hydrogen detection based on stabilized nanoparticles as catalytic layer

Brauns, E.; Morsbach, Eva; Kunz, Sebastian; Bäumer, Marcus; Lang, Walter

doi:10.1016/j.snb.2013.11.048

Cited by 52 publications

(76 citation statements)

References 32 publications

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“…3 Over the past few decades, many methods have been reported on developing novel gas sensors to detect the toxic gases. [4][5][6] Especially, the gas sensors based on metal oxide semiconductor are the most promising candidates for toxic gases detecting due to their outstanding advantages including high sensibility, low power consumption, quick response and minitype. 7 Up to now, a large number of metal oxide semiconductors such as SnO 2 , ZnO, Fe 2 O 3 , In 2 O 3 , NiO, and WO 3 (ref.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

Sun

Xiu

et al. 2017

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

Sun

Xiu

et al. 2017

RSC Adv.

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“…Power consumption of a micro gas sensor is an important issue for battery-powered operation [1,2]. Conversely, a homogeneous temperature distribution over the sensing element is needed for long-term stable operation [3].…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, a homogeneous temperature distribution over the sensing element is needed for long-term stable operation [3]. This is because higher temperature leads to sintering of nanoparticles and lower temperature causes water accumulation on catalytic layer [1]. As a result, the catalyst deactivates and sensitivity decreases.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Micro Gas Sensor with Excellent Homogeneous Temperature Distribution and Low Power Consumption for Long-Term Stable Operation

et al. 2018

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This paper presents a long-term stable thermoelectric micro gas sensor with ligand linked Pt nanoparticles as catalyst. The sensor design gives an excellent homogeneous temperature distribution over the catalytic layer, an important factor for long-term stability. The sensor consumes very low power, 18 mW at 100 °C heater temperature. Another thermoresistive sensor is also fabricated with same material for comparative analysis. The thermoelectric sensor gives better temperature homogeneity and consumes 23% less power than thermoresistive sensor for same average temperature on the membrane. The sensor shows linear characteristics with temperature change and has significantly high Seebeck coefficient of 6.5 mV/K. The output of the sensor remains completely constant under 15,000 ppm continuous H2 gas flow for 24 h. No degradation of sensor signal for 24 h indicates no deactivation of catalytic layer over the time. The sensor is tested with 3 different amount of catalyst at 2 different operating temperatures under 6000 ppm and 15,000 ppm continuous H2 gas flow for 4 h. Sensor output is completely stable for 3 different amount of catalyst.

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“…A new catalytic gas sensor was developed with a focus on small dimensions and small amounts of catalytic material to create a fast sensor device [ 6 – 9 ]. A catalytic combustion-based sensor was chosen, since that principle offers high dynamics due to a low response time, a low recovery time and no need of an additional recovery modus as in case of most MOS-based sensors [ 2 – 4 , 8 ]. Using this sensor design enables measuring advanced gas characteristics by modulation of the catalyst temperature and application of the Arrhenius approach as shown in [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Modulation of a Catalytic Gas Sensor

Brauns

Morsbach

Kunz

et al. 2014

Sensors

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The use of catalytic gas sensors usually offers low selectivity, only based on their different sensitivities for various gases due to their different heats of reaction. Furthermore, the identification of the gas present is not possible, which leads to possible misinterpretation of the sensor signals. The use of micro-machined catalytic gas sensors offers great advantages regarding the response time, which allows advanced analysis of the sensor response. By using temperature modulation, additional information about the gas characteristics can be measured and drift effects caused by material shifting or environmental temperature changes can be avoided. In this work a miniaturized catalytic gas sensor which offers a very short response time (<150 ms) was developed. Operation with modulated temperature allows analysis of the signal spectrum with advanced information content, based on the Arrhenius approach. Therefore, a high-precise electronic device was developed, since theory shows that harmonics induced by the electronics must be avoided to generate a comprehensible signal.

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A fast and sensitive catalytic gas sensors for hydrogen detection based on stabilized nanoparticles as catalytic layer

Cited by 52 publications

References 32 publications

Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

Synthesis and gas sensing properties of molybdenum oxide modified tungsten oxide microstructures for ppb-level hydrogen sulphide detection

Catalytic Micro Gas Sensor with Excellent Homogeneous Temperature Distribution and Low Power Consumption for Long-Term Stable Operation

Temperature Modulation of a Catalytic Gas Sensor

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