Zinc oxide nanobelts by RF sputtering for ethanol sensor

Choopun, Supab; Hongsith, Niyom; Mangkorntong, Pongsri; Mangkorntong, N.

doi:10.1016/j.physe.2006.12.053

Cited by 101 publications

(48 citation statements)

References 18 publications

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“…Elementary PL bands with the peaks at 2.55 and 1.98 eV were attributed earlier to the defect-related emissions in ZnO NCs [33][34][35][36]. The intensity of defect-related PL bands enlarges with increase in the anodization voltages due to increase in the volume of ZnO NC layers.…”

Section: Emission Study Of Zno Ncsmentioning

confidence: 94%

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Emission, Defects, and Structure of ZnO Nanocrystal Films Obtained by Electrochemical Method

Torchynska¹,

Filali²

2017

Thin Film Processes - Artifacts on Surface Phenomena and Technological Facets

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ZnO nanocrystal (NC) films, prepared by electrochemical etching with varying the technological routines, have been studied by means of photoluminescence (PL), scanning electronic microscopy (SEM), energy dispersion spectroscopy (EDS), Raman scattering, and X ray diffraction (XRD) techniques. Raman and XRD studies have confirmed that annealing stimulates the ZnO oxidation and crystallization with the formation of wurtzite ZnO NCs. The ZnO NC size decreases from 250-300 nm down to 40-60 nm with increasing the etching time. Two PL bands connected with the near-band edge (NBE) and defect-related emissions have been detected. Their intensity stimulation with NC size decreasing has been detected. The NBE emission enhancement is attributed to the week quantum confinement and exciton-light coupling with polariton formation in small ZnO NCs. The luminescence, morphology, and crystal structure of ZnO:Cu NCs versus Cu concentration have been investigated as well. The types of Cu-related complexes are discussed using the correlation between the PL spectrum transformations and XRD parameters. It is shown that the plasmon generation in Cu nanoparticles leads to the surface enhanced Raman scattering (SERS) effect and to PL intensity increasing the defect-related PL bands. The comparison of ZnO and ZnO:Cu NC emissions has been done and discussed.

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Section: Emission Study Of Zno Ncsmentioning

confidence: 94%

“…PL spectra of ZnO NCs are complex as well ( The bulk ZnO crystals are characterized by the variety of luminescence bands in UV and visible spectral ranges [33,34]. The origin of these emissions has not been conclusively established, and a number of hypotheses have been proposed for each emission band.…”

Section: Zno Nc Emission Studymentioning

confidence: 99%

Emission, Defects, and Structure of ZnO Nanocrystal Films Obtained by Electrochemical Method

Torchynska¹,

Filali²

2017

Thin Film Processes - Artifacts on Surface Phenomena and Technological Facets

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“…Development of synthetic methods for producing materials for use in metal oxide gas sensors has been a major focus in the field and many routes have been investigated including hydrothermal [5], sol-gel [6], solid-state chemical reaction [7], thermal evaporation [8], vapor-phase transport [9], RF sputtering [10] and molecular beam epitaxy [11]. Two common preparative routes are solid-state and sol-gel; solid-state reactions allow for relatively simple synthesis but for complex materials can lead to poor chemical homogeneity, whilst sol-gel reactions provide very good homogeneity and small particle size dispersion but the process can be difficult to control reproducibly.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

et al. 2016

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This article presents a review of recent research efforts and developments for the fabrication of metal-oxide gas sensors using chemical vapour deposition (CVD), presenting its potential advantages as a materials synthesis technique for gas sensors along with a discussion of their sensing performance. Thin films typically have poorer gas sensing performance compared to traditional screen printed equivalents, attributed to reduced porosity, but the ability to integrate materials directly with the sensor platform provides important process benefits compared to competing synthetic techniques. We conclude that these advantages are likely to drive increased interest in the use of CVD for gas sensor materials over the next decade, whilst the ability to manipulate deposition conditions to alter microstructure can help mitigate the potentially reduced performance in thin films, hence the current prospects for use of CVD in this field look excellent.

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“…4 Most common synthesis of ZnO have a totally oxidation phase without Zn metallic, this occurs either by chemical methods, 5-7 electrochemical 8,9 or sputtering. 10,11 Due to the lack of heterojunctions in a completely oxidized phase, ZnO is usually doped with metals to improve sensing performance [12][13][14] because of catalytic effect and oxidation resistance. ZnO nanoestructures have a higher surface area for sensing with different morphologies according with the methods and used conditions like needles, 15 belts, 4 wires 16 or rods 17 among others, where very thin structures could have better sensing performance because of greater depletion layer effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal treatment on Zn nanodisks

et al. 2015

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Metallic Zn nanodisks with hexagonal morphology were obtained onto glass substrate under vacuum thermal evaporation. A thermal characterization of Zn nanodiks showed a lower oxidation temperature than source powder Zn. Different thermal treatment on Zn nanodisks played an important role on the morphology, crystal size and surface vibrational modes of ZnO. The growth of ZnO nanoneedles started at the edge of metallic zinc hexagonal structures according with SEM images, the higher temperature the longer needles were grown. XRD diffractogram confirmed the wurtzite structure of ZnO with metallic nuclei. A wide band between 530 and 580 cm−1 of Raman scattering corresponded at surface vibrational modes not observed at higher temperature.

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Zinc oxide nanobelts by RF sputtering for ethanol sensor

Cited by 101 publications

References 18 publications

Emission, Defects, and Structure of ZnO Nanocrystal Films Obtained by Electrochemical Method

Emission, Defects, and Structure of ZnO Nanocrystal Films Obtained by Electrochemical Method

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

Effect of thermal treatment on Zn nanodisks

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