Development and Fabrication of TiO2 Tip Arrays for Gas Sensing

Hotovy, I.; Kostič, I.; Hascik, Stefan; Řeháček, V.; Liday, Jozef; Sitter, H.

doi:10.2478/v10187-011-0058-3

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…Evidently, a reduction of the geometric cross-section for the conduction paths and the island formation are responsible for the strong increase of resistivity with increase of temperature and free electrons in the conduction band and these free electrons increase electrical conductivity. In our samples the resistivity is increased with increasing temperature and the repetition of the layers the resistivity of the present films are in the range reported for other multilayer films [11]. The resistivity is increased slowly with increasing temperature.…”

Section: Plots Of Resistivity ρ Versus Temperature T For the Filmsupporting

confidence: 78%

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Kalkori,

Kori,

et al. 2020

IJEAT

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By using electron beam gun and thermal deposition techniques in the vacuum range 6 x10-5mbar. The pure materials of 99.99% purity of iron and aluminium multilayers films grown on glass substrates at 300K in the following viz. The resistance was measured using four probe method at UGC-DAE Consortium Indore (4.2K to 300K) later resistivity, conductivity, temperature co-efficient of resistance (TCR), residual resistivity ratio (RRR) , and activation energy(Ea) were calculated. The resistivity behavior shown that the resistivity is increased with increasing the n value, resistivity is increased with increasing temperature. The data belonging to metallic region has been analyzed using the conventional power law’s and it is first time this set of films have explore resistivity at low temperature.

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Section: Plots Of Resistivity ρ Versus Temperature T For the Filmsupporting

confidence: 78%

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Kalkori,

Kori,

et al. 2020

IJEAT

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“…The preferred surface orientations of both nickel oxide powder and microblast deposited NiO x coatings were the planes (111) and (200) ( Figure 5). 21 The signature of the crystallographic plane (220) at 20~ 58  was not detected for the microblast NiO x coatings 21 . 52,53 This is in addition to the very broad peak at ~861 eV, which is the shake-up satellite peak of Ni 2+ and Ni 3+ .…”

Section: Crystal and Chemical Compositions Of Microblast Deposited Nimentioning

confidence: 99%

“…3,4 The intrinsic p-type conductivity of NiO x is mainly related to its non-stoichiometric nature where Ni 3+ centers constitute the oxide defects through which holes are transferred. 5 Because of this interesting combination of electrical and optical properties, NiO x has been considered for energy storage applications, [6][7][8] in electrochromic devices as transparent electrode, 9-17 in optoelectronic devices as electron barrier, 18,19 for gas sensing, 20,21 and, more recently, in dye-sensitized solar cells (DSCs) as photoactive cathode. [22][23][24][25][26][27][28][29][30][31][32][33][34][35] The utilization of NiO x in such diverse applications has been accompanied by the development of various preparation methods and deposition techniques, aimed at producing NiO x -based materials with variable chemical composition, electrical resistivity, compactness and morphology.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Awais

Dini

MacElroy

et al. 2013

Journal of Electroanalytical Chemistry

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Publication information Journal of Electroanalytical Chemistry, Publisher Elsevier The UCD community has made this article openly available. Please share how this access benefits you. Your story matters! (@ucd_oa) Some rights reserved. For more information, please see the item record link above. In this contribution a novel powder coating processing technique (microblasting) for the fabrication of nickel oxide (NiOx) coatings is reported. ∼1.2 μm thick NiOx coatings are deposited at 20 mm2 s−1 by the bombardment of the NiOx powder onto a Ni sheet using an air jet at a speed of more than 180 m s−1. Microblast deposited NiOx coatings can be prepared at a high processing rate, do not need further thermal treatment. Therefore, this scalable method is time and energy efficient. The mechano-chemical bonding between the powder particles and substrate results in the formation of strongly adherent NiOx coatings. Microstructural analyses were carried out using SEM, the chemical composition and coatings orientation were determined by XPS and XRD, respectively. The electroactivity of the microblast deposited NiOx coatings was compared with that of NiOx coatings obtained by sintering NiOx nanoparticles previously sprayed onto Ni sheets. In the absence of a redox mediator in the electrolyte, the reduction current of microblast deposited NiOx coatings, when analyzed in anhydrous environment, was two times larger than that produced by higher porosity NiOx nanoparticles coatings of the same thickness obtained through spray coating followed by sintering. Under analogous experimental conditions thin layers of NiOx obtained by using the sol-gel method, ultrasonic spray-and electro-deposition show generally lower current density with respect to microblast samples of the same thickness. The electrochemical reduction of NiOx coatings is controlled by the bulk characteristics of the oxide and the relatively ordered structure of microblast NiOx coatings with respect to sintered NiOx nanoparticles here considered, is expected to increase the electron mobility and ionic charge diffusion lengths in the microblast samples. Finally, the increased level of adhesion of the microblast film on the metallic substrate affords a good electrical contact at the metal/metal oxide interface, and constitutes another reason in support of the choice of microblast as low-cost and scalable deposition method for oxide layers to be employed in electrochemical applications. Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

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“…In particular, an accurate control of the refractive index of individual layers of optical multilayer structures is highly desirable. In case of Ni x O films, it is well‐known that the composition affects their structural properties and surface morphology . However, the impact of composition on the refractive index has not been studied in detail yet.…”

Section: Introductionmentioning

confidence: 99%

Impact of Composition x on the Refractive Index of Ni_xO

Becker

Michel

Polity

et al. 2017

Physica Status Solidi (b)

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Epitaxial NixO thin films were grown on c‐plane (0001) sapphire substrates by ion beam sputtering (IBS) of a Ni metal target in a mixed argon and oxygen atmosphere. The composition of the film was varied systematically by varying the O2:Ar ratio in the IBS process. Structural characterization was carried out by X‐ray diffraction and scanning electron microscopy. All the NixO samples grew (111)‐oriented out‐of‐plane and with a defined two‐fold in‐plane orientation relationship relative to the crystalline substrate. The surface morphologies of the samples were very similar. The chemical bonding information of the films was examined by X‐ray photoelectron spectroscopy showing that the composition x could be varied in a wide range of x ≈ 0.9 to 1.5. Optical characterization yielded a strong dependence of the spectral dispersion of the refractive index and the band gap of NixO on composition for this otherwise structurally very similar series of samples. The dependence of the refractive index of NixO on composition x contributes significantly to the wide range of values reported for NixO in literature.

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Development and Fabrication of TiO2 Tip Arrays for Gas Sensing

Cited by 7 publications

References 11 publications

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Impact of Composition x on the Refractive Index of Ni_xO

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Development and Fabrication of TiO2 Tip Arrays for Gas Sensing

Cited by 7 publications

References 11 publications

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Resistivity of Fe Al Multilayered Thin Films from Low Temperature to Room Temperature

Electrochemical characterization of NiO electrodes deposited via a scalable powder microblasting technique

Impact of Composition x on the Refractive Index of NixO

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Product

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Impact of Composition x on the Refractive Index of Ni_xO