Resettable, Low-temperature Accumulation Gas Sensors Based on Hydrogenated Diamond Transducers

Müller, Gerhard; Krstev, Igor; Maier, Konrad; Helwig, Andreas; Stutzmann, M.; Garrido, José Antonio

doi:10.1016/j.proeng.2015.08.733

Cited by 7 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of a reducing gas, such as NH 3 ( Figure 15 e), the concentration of OH − ions increases due to the set of chemical reactions of the reducing gas with the adsorbed water monolayer. Due to the higher number of NH 4 + ions, the concentration of the ions decreases, and electrons are shifted to the diamond and partially neutralize the 2DHG, which finally reduces the diamond’s surface conductivity [ 10 , 12 ]. After exposure to a non-reducing (air) gas ( Figure 15 f), the number of OH − ions decreases and OH − equilibrates with H 3 O + again.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen-Terminated Diamond Surface as a Gas Sensor: A Comparative Study of Its Sensitivities

Kočí

Kromka

Bouřa

et al. 2021

Sensors

View full text Add to dashboard Cite

A nanocrystalline diamond (NCD) layer is used as an active (sensing) part of a conductivity gas sensor. The properties of the sensor with an NCD with H-termination (response and time characteristic of resistance change) are measured by the same equipment with a similar setup and compared with commercial sensors, a conductivity sensor with a metal oxide (MOX) active material (resistance change), and an infrared pyroelectric sensor (output voltage change) in this study. The deposited layer structure is characterized and analyzed by Scanning Electron Microscopy (SEM) and Raman spectroscopy. Electrical properties (resistance change for conductivity sensors and output voltage change for the IR pyroelectric sensor) are examined for two types of gases, oxidizing (NO2) and reducing (NH3). The parameters of the tested sensors are compared and critically evaluated. Subsequently, differences in the gas sensing principles of these conductivity sensors, namely H-terminated NCD and SnO2, are described.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Such a 2DHG top layer is sensitive to exposed gas or organic molecules [ 2 , 6 ]. The gas sensing properties of hydrogen-terminated diamond were explored thoroughly in previous works [ 2 , 6 , 7 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Terminated Diamond Surface as a Gas Sensor: A Comparative Study of Its Sensitivities

Kočí

Kromka

Bouřa

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Such a kind of gas sensing behaviour on H-diamond was first reported for NO2 and NH3 analyte gases with detection limit down to 5 and 2500 ppm, respectively [13][14][15][16][17]. Further, HD sensors exhibit a high degree of selectivity towards a particular group of analyte gas which dissolves in water [18,19]. Also, one more attractive feature of the H-diamond sensor is that it works even at room temperature and also, at humid conditions.…”

Section: Introductionmentioning

confidence: 91%

Enhanced sensitivity of partial O-terminated H-diamond for H2S detection at room temperature

Sulthana,

Ganesan,

Ajikumar

2023

Diamond and Related Materials

View full text Add to dashboard Cite

“…Concentrations in the low ppm range could thus be measured, here at 30% relative humidity, which interestingly did not affect the storage ability. Another material that shows an accumulating sensor signal is hydrogenated diamond [63]. It is thus possible to detect NO 2 in the ppm range at room temperature.…”

Section: Pre-considerationsmentioning

confidence: 99%

Novel Operation Strategy to Obtain a Fast Gas Sensor for Continuous ppb-Level NO2 Detection at Room Temperature Using ZnO—A Concept Study with Experimental Proof

Wagner

Schönauer-Kamin

Moos

2019

Sensors

View full text Add to dashboard Cite

A novel sensor operation concept for detecting ppb-level NO2 concentrations at room temperature is introduced. Today’s research efforts are directed to make the sensors as fast as possible (low response and recovery times). Nevertheless, hourly mean values can hardly be precisely calculated, as the sensors are still too slow and show baseline drifts. Therefore, the integration error becomes too large. The suggested concept follows exactly the opposite path. The sensors should be made as slow as possible and operated as resistive gas dosimeters. The adsorption/desorption equilibrium should be completely shifted to the adsorption side during a sorption phase. The gas-sensitive material adsorbs each NO2 molecule (dose) impinging and the sensor signal increases linearly with the NO2 dose. The actual concentration value results from the time derivative, which makes the response very fast. When the NO2 adsorption capacity of the sensor material is exhausted, it is regenerated with ultraviolet (UV) light and the baseline is reached again. Since the baseline is newly redefined after each regeneration step, no baseline drift occurs. Because each NO2 molecule that reaches the sensor material contributes to the sensor signal, a high sensitivity results. The sensor behavior of ZnO known so far indicates that ZnO may be suitable to be applied as a room-temperature chemiresistive NO2 dosimeter. Because UV enhances desorption of sorbed gas species from the ZnO surface, regeneration by UV light should be feasible. An experimental proof demonstrating that the sensor concept works at room temperature for ppb-level NO2 concentrations and low doses is given.

show abstract

Resettable, Low-temperature Accumulation Gas Sensors Based on Hydrogenated Diamond Transducers

Cited by 7 publications

References 5 publications

Hydrogen-Terminated Diamond Surface as a Gas Sensor: A Comparative Study of Its Sensitivities

Hydrogen-Terminated Diamond Surface as a Gas Sensor: A Comparative Study of Its Sensitivities

Enhanced sensitivity of partial O-terminated H-diamond for H2S detection at room temperature

Novel Operation Strategy to Obtain a Fast Gas Sensor for Continuous ppb-Level NO2 Detection at Room Temperature Using ZnO—A Concept Study with Experimental Proof

Contact Info

Product

Resources

About