scholarly journals Green Nanochemistry: Metal Oxide Nanoparticles and Porous Thin Films from Bare Metal Powders

Small ◽  
2011 ◽  
Vol 8 (1) ◽  
pp. 68-72 ◽  
Author(s):  
Engelbert Redel ◽  
Srebri Petrov ◽  
Ömer Dag ◽  
Jonathon Moir ◽  
Chen Huai ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Bare Metal ◽  
Metal Powders ◽  
Porous Thin Films

Preparation of perfect chalcopyrite ordering CuInS 2 thin films by high-temperature sulfurization of metal oxide nanoparticles

2015 ◽  
Vol 156 ◽  
pp. 153-155 ◽  
Author(s):  
Jiwan Liu ◽  
Jianmin Li ◽  
Guoshun Jiang ◽  
Weifeng Liu ◽  
Changfei Zhu
Keyword(s):  
Thin Films ◽  
High Temperature ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles

Antibacterial Activity of Photocatalytic Metal Oxide Thin Films Deposited by Layer-by-Layer Self-Assembly

2021 ◽  
Vol 21 (5) ◽  
pp. 2855-2863
Author(s):  
Pedro J. Rivero ◽  
Joseba Esparza ◽  
Ricardo San Martín ◽  
Ana I. Vitas ◽  
Gonzalo G. Fuentes ◽  
...  
Keyword(s):  
Thin Films ◽  
Antibacterial Activity ◽  
Metal Oxide ◽  
Self Assembly ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Layer By Layer ◽  
Water Contact ◽  
Vis Spectroscopy ◽  
Polymeric Chains

This paper reports the use of the Layer-by-Layer self-assembly (LbL) as an efficient technique for the fabrication of thin-films with antibacterial activity. The LbL coatings are composed of a positive polyelectrolyte such as Poly(allylamine hydrochloride) (PAH) and an anionic polyelectrolyte such as Poly(sodium 4-styrene sulfonate) solution (PSS). In addition, these polyelectrolytes can be also used as an adequate encapsulating agent of specific metal oxide precursors such as titanium dioxide (TiO2) and iron oxide (Fe2O3) nanoparticles, making possible the fabrication of hybrid thin films composed of organic polymeric chains related to the polyelectrolytes and inorganic structure associated to the metal oxide nanoparticles. Four different LbL coatings have been fabricated and a comparative study about the resultant topographical, optical and wettability properties is presented by using light interferometry, atomic force microscopy (AFM), UV-Vis spectroscopy and water contact angle (WCA) measurements. In addition, X-ray fluorescence (XRF) has been also employed in order to corroborate the presence of metal oxide precursors inside the polymeric chains of the polyelectrolytes. Finally, the antibacterial tests have demonstrated that LbL coatings composed of metal oxide nanoparticles produce an enhancement in the efficacy and antibacterial activity.

scholarly journals From Bare Metal Powders to Colloidally Stable TCO Dispersions and Transparent Nanoporous Conducting Metal Oxide Thin Films

Small ◽  
2012 ◽  
Vol 8 (24) ◽  
pp. 3806-3809 ◽  
Author(s):  
Engelbert Redel ◽  
Chen Huai ◽  
Ömer Dag ◽  
Srebri Petrov ◽  
Paul G. O'Brien ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxide ◽  
Bare Metal ◽  
Metal Powders ◽  
Oxide Thin Films ◽  
Metal Oxide Thin Films

High performance polymer/BaTiO3 nanocomposites based on surface-modified metal oxide nanoparticles using functional phosphonic acids for electronic applications

2008 ◽  
Vol 1113 ◽  
Author(s):  
Philseok Kim ◽  
Natalie M. Doss ◽  
John P. Tillotson ◽  
Xiao-Hong Zhang ◽  
Simon C. Jones ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Metal Oxide ◽  
Phosphonic Acid ◽  
Volume Fraction ◽  
Metal Oxide Nanoparticles ◽  
Dielectric Strength ◽  
Oxide Nanoparticles ◽  
High Quality ◽  
Nanocomposite Thin Films

ABSTRACTPolymer/ceramic nanocomposites provide a means of combining the high permittivities (εr) of metal oxide nanoparticles with the solution-processability and high dielectric strength of polymeric hosts. Simple mixing of nanoparticles and polymers generally results in poor quality nanocomposites due to the agglomeration of nanoparticles and poor miscibility of nanoparticles with host materials. We have shown that surface modification of metal oxide nanoparticles with phosphonic acid-based ligands affords robust surface modification and improves the processiblity and the quality of the resulting nanocomposites. We report on the use of phosphonic-acid modified barium titanate (BaTiO3, BT) nanoparticles in dielectric nanocomposites and their applications to high-energy-density capacitors and solution-processable high permittivity gate insulators in organic field-effect transistors (OFETs). Surface modification of BT nanoparticles enabled the formation of high quality nanocomposite thin films with ferroelectric polymer hosts such as poly(vinylidene fluoride-co-hexafluoropropylene), P(VDF-HFP), with large volume fractions (up to 50 vol. %), which are potentially useful materials for electrical energy storage. Similarly, the use of phosphonic acid-modified BT nanoparticles in cross-linked poly(4-vinylphenol) (PVP) allowed to form gate insulators for OFETs. High quality nanocomposite thin films at high nanoparticle volume fractions (up to 37 vol. %) with a large capacitance density (∼50 nF/cm2) and a low leakage current (10−8 A/cm2) were obtained. Pentacene-based p-type OFETs using these nanocomposites showed a large on/off current ratio (Ion/off 104 ∼ 106). We will also present the results from a recent experimental and theoretical study where the BT nanoparticle volume fraction was systematically varied in P(VDF-HFP) host, εr = 11, to find the optimum permittivity and dielectric strength, which provided a guideline for the optimization of the volume fraction for achieving maximum energy density.

scholarly journals Optical characterizations of PMMA/metal oxide nanoparticles thin films: bandgap engineering using a novel derived model

Heliyon ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. e05952
Author(s):  
Qais M. Al-Bataineh ◽  
Ahmad.A. Ahmad ◽  
A.M. Alsaad ◽  
Ahmad D. Telfah
Keyword(s):  
Thin Films ◽  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Bandgap Engineering

Star fruit extract-mediated green synthesis of metal oxide nanoparticles

2021 ◽  
pp. 1-8
Author(s):  
Sagadevan Suresh ◽  
Selvaraj Vennila ◽  
J. Anita Lett ◽  
Is Fatimah ◽  
Faruq Mohammad ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Green Synthesis ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Fruit Extract ◽  
Star Fruit
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