Gas sensing properties of nanocrystalline diamond at room temperature

Davydova, Marina; Kulha, Pavel; Laposa, Alexandr; Hruška, Karel; Demo, P.; Kromka, Alexander

doi:10.3762/bjnano.5.243

Cited by 21 publications

(18 citation statements)

References 21 publications

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“…Similar behavior was observed by Davydova et al ., wherein the resistance of the sensor at RT was increased or decreased due to the electrolytic dissociation of the gasses in the surface layer 62 . Similarly, Gao et al .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Gas Sensing Properties of Spin-coated Na-doped ZnO Nanostructured Films

Basyooni

Shaban

Sayed

2017

Sci Rep

161

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In this report, the structures, morphologies, optical, electrical and gas sensing properties of ZnO and ZnO: Na spin-coated films are studied. X-ray diffraction (XRD) results reveal that the films are of a single phase wurtzite ZnO with a preferential orientation along (002) direction parallel to c-axis. Na doping reduces the crystalline quality of the films. The plane surface of ZnO film turned to be wrinkle net-work structure after doping. The reflectance and the optical band gap of the ZnO film decreased after Na doping. The wrinkle net-work nanostructured Na-doped film shows an unusually sensitivity, 81.9% @ 50 sccm, for CO2 gas at room temperature compared to 1.0% for the pure ZnO film. The signals to noise ratio (SNR) and detection limit of Na-doped ZnO sensor are 0.24 and 0.42 sccm, respectively. These enhanced sensing properties are ascribed to high surface-to-volume ratio, hoping effect, and the increase of O- vacancies density according to Kroger VinK effect. The response time increased from 179 to 240 s by the incorporation of Na atoms @50 sccm. This response time increased as the CO2 concentration increased. The recovery time is increased from 122 to 472 s by the incorporation of Na atoms @50 sccm.

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Section: Resultsmentioning

confidence: 99%

Enhanced Gas Sensing Properties of Spin-coated Na-doped ZnO Nanostructured Films

Basyooni

Shaban

Sayed

2017

Sci Rep

161

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“…Recently, nanocrystalline diamond (NCD) films have been utilized for advanced electronic devices because of their remarkable semiconducting properties [ 20 – 21 ]. For instance, hydrogen-terminated NCD films exhibit changes in their surface conductivity in the presence of phosgene and could be utilized as an integrator-type gas sensor [ 22 – 23 ]. Up to now, many research groups have focused on nitrogen dioxide (NO 2 ) sensing.…”

Section: Introductionmentioning

confidence: 99%

Gas-sensing behaviour of ZnO/diamond nanostructures

Davydova¹,

Laposa

Šmarhák

et al. 2018

Beilstein J. Nanotechnol.

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Microstructured single- and double-layered sensor devices based on p-type hydrogen-terminated nanocrystalline diamond (NCD) films and/or n-type ZnO nanorods (NRs) have been obtained via a facile microwave-plasma-enhanced chemical vapour deposition process or a hydrothermal growth procedure. The morphology and crystal structure of the synthesized materials was analysed with scanning electron microscopy, X-ray diffraction measurements and Raman spectroscopy. The gas sensing properties of the sensors based on i) NCD films, ii) ZnO nanorods, and iii) hybrid ZnO NRs/NCD structures were evaluated with respect to oxidizing (i.e., NO2, CO2) and reducing (i.e., NH3) gases at 150 °C. The hybrid ZnO NRs/NCD sensor showed a remarkably enhanced NO2 response compared to the ZnO NRs sensor. Further, inspired by this special hybrid structure, the simulation of interaction between the gas molecules (NO2 and CO2) and hybrid ZnO NRs/NCD sensor was studied using DFT calculations.

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“…Hydrogenated nanocrystalline diamond (NCD) films synthesized using chemical vapor deposition (CVD) techniques have been demonstrated for the detection of ammonia (NH3) [6]. The three-dimensional model of the current density distribution of the hydrogenated NCD was used to describe the transient flow of electrons between interdigitated electrodes and the hydrogenated NCD surface [7].…”

Section: Introductionmentioning

confidence: 99%