Analysis of TiO2 for microelectronic applications: effect of deposition methods on their electrical properties

Rathee, Davinder; Arya, Sandeep; Kumar, Mukesh

doi:10.1007/s12200-011-0188-z

Cited by 27 publications

(16 citation statements)

References 32 publications

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“…In the medical domain, TiO 2 NP are used as components for prosthetic implants (hip, knees, dental implants) or in intravenous injection [3][4][5]. TiO 2 NP are also found in other various applications like paint, glass, electronic and water treatment industries [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Toxicity of TiO2 Nanoparticles: Validation of Alternative Models

Leroux

Doumandji

Chézeau

et al. 2020

IJMS

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There are many studies concerning titanium dioxide (TiO2) nanoparticles (NP) toxicity. Nevertheless, there are few publications comparing in vitro and in vivo exposure, and even less comparing air–liquid interface exposure (ALI) with other in vitro and in vivo exposures. The identification and validation of common markers under different exposure conditions are relevant for the development of smart and quick nanotoxicity tests. In this work, cell viability was assessed in vitro by WST-1 and LDH assays after the exposure of NR8383 cells to TiO2 NP sample. To evaluate in vitro gene expression profile, NR8383 cells were exposed to TiO2 NP during 4 h at 3 cm2 of TiO2 NP/cm2 of cells or 19 μg/mL, in two settings—submerged cultures and ALI. For the in vivo study, Fischer 344 rats were exposed by inhalation to a nanostructured aerosol at a concentration of 10 mg/m3, 6 h/day, 5 days/week for 4 weeks. This was followed immediately by gene expression analysis. The results showed a low cytotoxic potential of TiO2 NP on NR8383 cells. Despite the absence of toxicity at the doses studied, the different exposures to TiO2 NP induce 18 common differentially expressed genes (DEG) which are involved in mitosis regulation, cell proliferation and apoptosis and inflammation transport of membrane proteins. Among these genes, we noticed the upregulation of Ccl4, Osm, Ccl7 and Bcl3 genes which could be suggested as early response biomarkers after exposure to TiO2 NP. On the other hand, the comparison of the three models helped us to validate the alternative ones, namely submerged and ALI approaches.

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Section: Introductionmentioning

confidence: 99%

Toxicity of TiO2 Nanoparticles: Validation of Alternative Models

Leroux

Doumandji

Chézeau

et al. 2020

IJMS

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“…The great interest in TiO 2 as photocatalyst is related to its low-cost, non-toxicity, high stability and photoactivity, and earth-abundance [5][6][7][11][12][13][14][15]. TiO 2 commonly appears in the amorphous form or as three distinct crystalline phases: two tetragonal ones, anatase and rutile, and as an orthorhombic phase, brookite [16]. From these crystalline phases, rutile is the most stable, while anatase and brookite are metastable and can be converted to rutile upon heating [17].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

et al. 2017

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Abstract:In the present study, titanium dioxide nanostructures were synthesized through microwave irradiation. In a typical microwave synthesis, nanorod spheres in the powder form were simultaneously produced with nanorod arrays grown on polyethylene terephthalate (PET) substrates. The syntheses were performed in water or ethanol with limited temperature at 80 • C and 200 • C. A simple and low-cost approach was used for the arrays growth, which involved a PET substrate with a zinc oxide seed layer deposited by spin-coating. X-ray diffraction (XRD) and Raman spectroscopy revealed that synthesis in water result in a mixture of brookite and rutile phases, while using ethanol as solvent it was only observed the rutile phase. Scanning electron microscopy (SEM) showed that the synthesized spheres were in the micrometer range appearing as aggregates of fine nanorods. The arrays maintained the sphere nanorod aggregate structures and the synthesis totally covered the flexible substrates. Transmission electron microscopy (TEM) was used to identify the brookite structure. The optical band gaps of all materials have been determined from diffuse reflectance spectroscopy. Photocatalytic activity was assessed from rhodamine B degradation with remarkable degradability performance under ultraviolet (UV) radiation. Reusability experiments were carried out for the best photocatalyst, which also revealed notable photocatalytic activity under solar radiation. The present study is an interesting and competitive alternative for the photocatalysts existing nowadays, as it simultaneously results in highly photoactive powders and flexible materials produced with low-cost synthesis routes such as microwave irradiation.

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“…TiO2 is a n-type semiconductor usually appearing in an amorphous state or as three crystalline phases: the tetragonal phases, anatase and rutile, and an orthorhombic phase, brookite [187]. Rutile is the most stable phase, in which both anatase and brookite are metastable, transforming to rutile when heated [188].…”

Section: Titanium Dioxidementioning

confidence: 99%

Metal oxide nanostructures for sensor applications

Nunes

Pimentel

Gonçalves

et al. 2019

Semicond. Sci. Technol.

263

119

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Human health, environmental protection and safety are just a few examples of current humankind main concerns, that drive the scientific community to develop sensors able to precisely monitor and alert to possible harms in real time. Over the years, semiconductor metal oxide-based materials have been largely employed as sensors dedicated to several applications, being particularly interesting at the nanometer scale, since it is largely known that smaller crystallite size enhances sensor's performance. Moreover, these materials are highly appealing as they can be produced by low-cost wet-chemical synthesis routes and are in general nontoxic, earth abundant and low-cost. This manuscript extensively reviews the recent developments of nanostructured semiconductor metal oxide sensors ranging from gas to humidity sensors, including ultraviolet (UV) sensors and biosensors. Zinc oxide (ZnO), titanium dioxide (TiO2), tungsten trioxide (WO3), copper oxide (CuO and Cu2O), tin oxide (SnO and SnO2), and vanadium oxide (VO2, V2O5)-based sensors either as nanoparticles or as continuous films/layers are described. Their sensing properties are correlated to size, shape, presence of defects, doping elements, amongst other relevant parameters. Different techniques and methods of fabricating these materials are addressed. The review is concluded with novel approaches for functionalization and future perspectives for sensor developments.

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Analysis of TiO2 for microelectronic applications: effect of deposition methods on their electrical properties

Cited by 27 publications

References 32 publications

Toxicity of TiO2 Nanoparticles: Validation of Alternative Models

Toxicity of TiO2 Nanoparticles: Validation of Alternative Models

Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications

Metal oxide nanostructures for sensor applications

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