Gas sensing properties of hydrogen-terminated diamond

Helwig, Andreas; Müller, Gerhard; Garrido, José Antonio; Eickhoff, Martin

doi:10.1016/j.snb.2008.02.007

Cited by 51 publications

(58 citation statements)

References 31 publications

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“…A similar argument has been made for diamond in contact with ambient gases, proposing that the H-terminated diamond sample is covered with a thin ($1 nm) thick layer containing O 2 and other redox-active species [31].…”

supporting

confidence: 58%

Atmospheric‐pressure photoelectron emission from H‐terminated and amino‐terminated diamond

Hamers

Bandy

2016

Physica Status Solidi (a)

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Phone: þ01 608 262 6371, Fax: þ01 608 262 0453We report investigations of the ultraviolet-induced emission of electrons from diamond into air, argon, and SF 6 gases at atmospheric pressure. Although diamond has long been known to be a facile emitter of electrons in vacuum, the present results show that H-terminated and amino-terminated diamond can also act as emitters of low-energy electrons into gases at atmospheric pressure. Present results show that emission currents follow the trend Ar > air > SF 6 . We attribute these differences to the fact that Ar does not form stable anions and the emitted electrons remain as free electrons with very low effective mass, while electrons in air form O 2 À and electrons in SF 6 form SF 6 À anions. The observed trends are consistent with trends reported in ion mobility measurements.Photoemission of electrons from diamond into argon gas at atmospheric pressure.

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supporting

confidence: 58%

Atmospheric‐pressure photoelectron emission from H‐terminated and amino‐terminated diamond

Hamers

Bandy

2016

Physica Status Solidi (a)

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“…Dependent on the interaction between the sorbent and the analyte, different regeneration procedures are effective to recover the sorption capacity as well as the sensor signal. They include thermal decomposition at elevated temperatures (Katayama et al, 2004;Helwig et al, 2008;Kubinski and Visser, 2008;Brunet et al, 2008;Brandenburg et al, 2013;Groß et al, 2013a), chemical reactions, e.g., by a changed gas atmosphere (Helwig et al, 2007(Helwig et al, , 2008Groß et al, 2012a) or optical-induced desorption, e.g., by UV light (Li et al, 2003;Helwig et al, 2008).…”

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

“…In the literature, this change in the accumulationlevel is detected mainly optically (Tanaka et al, 1999;Sasaki et al, 2001;Maruo, 2007) or gravimetrically (Matsuguchi et al, 2005). Recently impedimetric approaches have emerged (Varghese et al, 2001;Mattoli et al, 2007;Helwig et al, 2008;Geupel et al, 2010;Hennemann et al, 2012a;Groß et al, 2012c). Regeneration has to be initiated if saturation effects limit the sorption rate of the sensitive layer or if the sensing characteristic is deteriorated.…”

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

“…The recovery times of the dosimeter can be enhanced by a temperature increase, or by ozone or UV light. Figure 6c shows the reset of the sensor response after exposure to NH 3 in different concentrations by a short O 3 pulse after each ammonia phase, causing the oxidation of NH 3 at the sensor surface at room temperature (Helwig et al, 2008).…”

Section: Examples For Conductometric Gas Dosimetersmentioning

confidence: 99%

“…The hydrogenated diamond-based sensor can be regenerated thermally by O 3 or UV light (Helwig et al, 2007(Helwig et al, , 2008.…”

Section: Suitable Materials For Accumulating Gas Sensorsmentioning

confidence: 99%

See 2 more Smart Citations

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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Abstract. The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.

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Selective detection of phosgene by nanocrystalline diamond layer

Davydova

Kromka

Exnar

et al. 2009

Physica Status Solidi (a)

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Nanocrystalline diamond (NCD) films were grown on gold/Al 2 O 3 substrate using microwave plasma-enhanced chemical vapor deposition (PECVD) process. The NCD morphology was controlled by the deposition time and it was investigated by scanning electron microscopy (SEM). Gas sensing properties of NCD surface conductivity to humid air, CO 2 , NH 3 , and COCl 2 gases were measured by impedance measurements at room and at high temperature (140 • C). The H-terminated NCD surface shows a significant response to oxidizing gas (humid air, COCl 2 ) in comparison to reducing gases (CO 2 , NH 3 ).

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Gas sensing properties of hydrogen-terminated diamond

Cited by 51 publications

References 31 publications

Atmospheric‐pressure photoelectron emission from H‐terminated and amino‐terminated diamond

Atmospheric‐pressure photoelectron emission from H‐terminated and amino‐terminated diamond

Overview on conductometric solid-state gas dosimeters

Selective detection of phosgene by nanocrystalline diamond layer

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