Hardness of nanocrystalline TiO

Wojcieszak, Damian; Kaczmarek, Danuta; Domaradzki, J.; Prociów, E.; Placido, Frank; Lapp, S.; Mazur, М.

doi:10.1109/stysw.2010.5714178

Cited by 3 publications

(1 citation statement)

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“…[10][11][12] Previous works on reference TiO 2 n-type photocatalysts have revealed that the photocatalytic activity can be enhanced by increasing the concentration ratio of surface defects to bulk defects by annealing [13,14] or by doping. [15,16] Likewise, choosing the right morphology plays a crucial role in structural stability and photocatalytic activity, influencing the preferential charge localization and transfer rate. Remarkable catalytic activity and short activity time were observed for the 1D nanostructures, [17] despite their lower specific surface compared to flower-like or nanosphere morphologies, owing to the facile pollutant access to the active sites.…”

Section: Introductionmentioning

confidence: 99%

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

et al. 2023

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Herein, a surface cleaning procedure involving vacuum annealing under oxygen was applied for cleaning the zinc oxide nanorod (ZNR) scaffold film's surface before nickel oxide (NiO) deposition for heterostructure formation. The scaffold properties (surface stoichiometry, defects fluctuation, Fermi level shift, carrier concentration) were studied as a function of the vacuum level and the NiO deposition time and correlated to the NiO/ ZNR interface (charge transfer resistance, band bending) and photo-response properties. The surface cleaning under a higher vacuum enabled the adsorbate and surface oxygen vacancy passivation but also influenced the surface doping. Our best performing NiO/ZNR interface in terms of photocatalytic efficiency was composed of a high-vacuum-cleaned (0.5 Pa) ZNR scaffold and 40 s sputter deposited NiO layer which was post-annealed. The high photocatalytic efficiency could be correlated with a maximized near-band edge emission, effective band bending, low charge transfer resistance (as proven by photoelectrochemical impedance measurements), and optimum light harvesting (maximized photocurrent density). The optimized NiO/ZNR showed about 1.5 times increase in photoresponse and improved photodegradation efficiency compared to the ZNR scaffold.

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Section: Introductionmentioning

confidence: 99%

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

et al. 2023

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Using a coupled optical and electrical monitoring method to follow the R-HiPIMS TiO₂ deposition process drifts

Boivin,

Jean-Marie-Désirée,

Najah

et al. 2024

Phys. Scr.

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In this work, coupled optical and electrical discharge measurements have been implemented to investigate the plasma state of a reactive HiPIMS TiO2 deposition process running at a fixed duty cycle of 2% and at a repetition rate of 1 kHz. Investigations focus on both the effect of the erosion target and substrate-holder temperature in an Ar/O2 gas mixture at fixed working pressure. First, as the racetrack shape evolves with the use of the target, the deposition rate is modified, in the same way as the emission intensity measured. Second, with the heater set at 400 °C in pure Ar, the coating appears thinner, and the optical emission spectroscopy measurement reveals the presence of oxygen atoms. Thus, the results from the coupled optical and electrical measurements are sensitive enough to track potential drift of the process.

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Hard and Transparent Films Formed by Nanocellulose–TiO2 Nanoparticle Hybrids

et al. 2012

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The formation of hybrids of nanofibrillated cellulose and titania nanoparticles in aqueous media has been studied. Their transparency and mechanical behavior have been assessed by spectrophotometry and nanoindentation. The results show that limiting the titania nanoparticle concentration below 16 vol% yields homogeneous hybrids with a very high Young’s modulus and hardness, of up to 44 GPa and 3.4 GPa, respectively, and an optical transmittance above 80%. Electron microscopy shows that higher nanoparticle contents result in agglomeration and an inhomogeneous hybrid nanostructure with a concomitant reduction of hardness and optical transmittance. Infrared spectroscopy suggests that the nanostructure of the hybrids is controlled by electrostatic adsorption of the titania nanoparticles on the negatively charged nanocellulose surfaces.

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Hardness of nanocrystalline TiO

Cited by 3 publications

References 10 publications

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

Using a coupled optical and electrical monitoring method to follow the R-HiPIMS TiO₂ deposition process drifts

Hard and Transparent Films Formed by Nanocellulose–TiO2 Nanoparticle Hybrids

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Hardness of nanocrystalline TiO

Cited by 3 publications

References 10 publications

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization

Using a coupled optical and electrical monitoring method to follow the R-HiPIMS TiO2 deposition process drifts

Hard and Transparent Films Formed by Nanocellulose–TiO2 Nanoparticle Hybrids

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Using a coupled optical and electrical monitoring method to follow the R-HiPIMS TiO₂ deposition process drifts