Photoelectrochemical Behaviors of Pt/TiO2 Nanocomposite thin films Electrodes Prepared by PLD/Sputtering Combined System

2004 ◽  
Vol 846 ◽  
Author(s):  
Takeshi Sasaki ◽  
William T. Nichols ◽  
Jong-Won Yoon ◽  
Naoto Koshizaki
Keyword(s):  
Thin Films ◽  
Wavelength Region ◽  
Pt Nanoparticles ◽  
Band Gap Energy ◽  
Nanocomposite Films ◽  
Combined System ◽  
Post Annealing ◽  
Nanocomposite Thin Films ◽  
New Energy ◽  
The Matrix

ABSTRACTSputtering of TiO2 and pulse laser deposition (PLD) of Pt were performed simultaneously to build the nanocomposite with homogenous dispersion of Pt in TiO2 matrix. The films exhibited a pronounced decrease in the optical band gap energy with increasing Pt content indicating the formation of new energy states in the optical gap of TiO2 matrix. As-deposited nanocomposite films were amorphous and crystallized to Pt metal and rutile type of TiO2 after post-annealing at 600 °C. Pt nanoparticle size in the annealed nanocomposite films increased from 6 to 9 nm with the repetition rate of the laser. The photoelectrochemical measurements of the Pt/TiO2 nanocomposite films in aqueous 0.1 M Na2SO4 solution indicate that a dramatic increase in anodic photocurrent at 1.0 V vs. Ag/AgCl at the wavelength region of visible light occurred in annealed films. Pt nanoparticles in the matrix of TiO2 can play an important role in the optical and photoelectrochemical proprieties of Pt/TiO2 nanocomposite thin films.

Enhanced electrical conductivity of Au–LaNiO3 nanocomposite thin films by chemical solution deposition

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76783-76787 ◽  
Author(s):  
H. L. Wang ◽  
X. K. Ning ◽  
Z. J. Wang
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Chemical Solution Deposition ◽  
Nanocomposite Films ◽  
Chemical Solution ◽  
Solution Deposition ◽  
Nanocomposite Thin Films ◽  
One Step

Au–LaNiO3 (Au–LNO) nanocomposite films with 3.84 at% Au were firstly fabricated by one-step chemical solution deposition (CSD), and their electrical properties were investigated.

Nanoparticle Reinforced Metal Composites Prepared by Electrocodeposition

2013 ◽  
Author(s):  
Michael J. Koludrovich ◽  
Yong X. Gan
Keyword(s):  
Thin Films ◽  
Nanocomposite Films ◽  
Alumina Nanoparticles ◽  
Al2o3 Nanoparticles ◽  
Nanoparticle Agglomeration ◽  
Control Film ◽  
Significant Difference ◽  
Nanocomposite Thin Films ◽  
Agglomeration Of Nanoparticles ◽  
Pure Cu

Improving the physical and mechanical properties such as hardness and strength of metal thin films can be achieved by incorporating nanoparticles into the pure metals, for example via electrocodeposition. However, the agglomeration of nanoparticles during electrocodeposition of nanocomposite thin films is an unresolved issue. This paper presents the preliminary results of electrocodeposition thin nanocomposite films under different processing conditions. The microstructure and distribution of Al2O3 nanoparticles in electrocodeposited Cu matrix nanocomposite thin films on a pure Al plate were examined. In addition, the effect of electrolyte concentration on the agglomeration of nanoparticles was studied. Different stirring times were used for electrodepositing the alumina/Cu nanocomposite and the pure Cu control film. Under the constant stirring condition, different deposition times including 1, 4, 8, 12, and 24 hours were taken to study the differences between the agglomeration states of the alumina nanoparticles with the time change. We also examined the effect of turning the electromagnetic stirrer ON and OFF at different time intervals from as short as every 20 minutes to as long as ON and OFF every 2 hours on the nanoparticle agglomeration in the film. Optical and electron microscopic studies were made to reveal the microstructure of the nanocomposite. It is found that there is no significant difference in microstructures for the specimens that made under either intermittent stirring or constant stirring for the same length of time.

Optical interpretation for plasmonic adjustment of nanostructured Ag-NiO thin films

2021 ◽  
Vol 35 (06) ◽  
pp. 2150093
Author(s):  
A. Stamatelatos ◽  
M. Tsarmpopoulou ◽  
A. G. Chronis ◽  
N. Kanistras ◽  
D. I. Anyfantis ◽  
...  
Keyword(s):  
Thin Films ◽  
Theoretical Calculations ◽  
Annealing Treatment ◽  
Silicon Substrates ◽  
Surface Plasmon Resonances ◽  
Corning Glass ◽  
Post Annealing ◽  
Nanocomposite Thin Films ◽  
Plasmon Resonances ◽  
Growth Properties

Ultrathin Ag and Ni/NiO films are sequentially produced on Corning glass and silicon substrates by means of magnetron sputtering. Post annealing treatment in a furnace with air at [Formula: see text]C and [Formula: see text]C may lead to the formation of Ag nanostructures in NiO environment. Some of these samples present local surface plasmon resonances (SPRs). The sequence in which each layer is deposited, as well as, the state of the structure on which the layer is deposited, appears to play a pivotal role in the optical properties of these nanostructures, which are attributed to the growth properties of the nanocomposite thin films. Ultimately, rigorous theoretical calculations have been made for comparison and discussion with the experimental results.

Enhanced Polarization Switching Characteristics of Pb(Zr0.5Ti0.5)O3–Pt Nanocomposite Thin Films

2004 ◽  
Vol 19 (4) ◽  
pp. 1043-1049 ◽  
Author(s):  
Cheng-Wei Cheng ◽  
Yuan-Chieh Tseng ◽  
Tai-Bor Wu ◽  
Li-Jen Chou
Keyword(s):  
Thin Films ◽  
Single Layer ◽  
Polarization Switching ◽  
Nano Particles ◽  
Nanocomposite Films ◽  
Pzt Film ◽  
Nanocomposite Thin Films ◽  
Switching Characteristics ◽  
Pt Films ◽  
Nanocomposite Structures

The effect of nanoscale Pt particles embedded in ferroelectric matrix on the polarization switching characteristics of Pb(Zr0.5Ti0.5)O3(PZT) thin films of low thickness was investigated. Two different nanocomposite structures of PZT-Pt thin films were fabricated for the study. The first one incorporated a single layer of Pt nano-particles embedded in the PZT film, which was formed by annealing an ultrathin Pt layer that had been inserted into the middle of the deposited PZT. The other one had Pt nano-particles embedded uniformly and coherently in the lattice of the PZT matrix, which was generated by annealing the cosputtered films of PZT and Pt. The electric field applied on the films can be locally intensified near the embedded Pt particles, which markedly enhances the polarization switching characteristic of the above PZT-Pt nanocomposite films. Accordingly, a satisfactorily higher remanent polarization was obtained than exhibited by normal PZT films, but the coercive field was only slightly higher. However, adding an excess of Pt made the nanocomposite films too leaky to exhibit the enhancement. Moreover, the nanocomposite PZT-Pt films in the capacitor configuration of Pt/LaNiO3/PZT-Pt/LaNiO3/Pt also exhibited highly reliable polarization retention and fatigue resistance.

scholarly journals Effects of Temperature on the Structural and Optical Preperties of AgGaSe2 Thin Films

1970 ◽  
Vol 33 (2) ◽  
pp. 179-188
Author(s):  
MRA Bhuiyan ◽  
DK Saha ◽  
SM Firoz Hasan
Keyword(s):  
Thin Films ◽  
Annealing Temperature ◽  
Visible Region ◽  
Wavelength Region ◽  
Band Gap Energy ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Glass Substrates ◽  
Academy Of Sciences ◽  
Post Deposition

In this study, AgGaSe2 (AGS) thin films were formed onto cleaned glass substrates by using the stacked elemental layer (SEL) deposition technique in vacuum. The films were prepared at the post-deposition annealing temperature from 100 to 350°C for 15 min duration. The atomic composition of the films was measured by energy dispersive analysis of X-ray (EDAX) method. The films ascertain the compositional uniformity. The X-ray diffraction (XRD) has been employed to study the structure of the films. The structures of the films are found to be polycrystalline in nature. The lattice parameters, grain size, strain and dislocation densities of the films were calculated. Optical characteristics of the films were ascertained by spectrophotometer in the photon wavelength ranging between 300 and 2500 nm. The transmittance was found to increase with the increase of annealing temperature. The transmittance falls steeply with decreasing wavelength. It revealed that AGS films have considerable absorption throughout the wavelength region from 400 to 800 nm. The optical band gap energy has been evaluated. Two possible direct allowed and direct forbidden transitions have been observed for all the AGS films in visible region. The former varied from 1.67 to 1.75 eV and the later from 2.05 to 2.08 eV, depending on the post-deposition annealing temperature of the films. DOI: 10.3329/jbas.v33i2.4101 Journal of Bangladesh Academy of Sciences, Vol. 33, No. 2, 179-188, 2009

Gravure printed sol–gel derived AlOOH hybrid nanocomposite thin films for printed electronics

2015 ◽  
Vol 3 (8) ◽  
pp. 1776-1786 ◽  
Author(s):  
Terho Kololuoma ◽  
Jaakko Leppäniemi ◽  
Himadri Majumdar ◽  
Rita Branquinho ◽  
Elena Herbei-Valcu ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Printed Electronics ◽  
Sol Gel ◽  
Nanocomposite Films ◽  
Hybrid Nanocomposite ◽  
Gravure Printing ◽  
Nanocomposite Thin Films ◽  
High Dielectric

We report a sol–gel approach to fabricate aluminum oxyhydroxide (AlOOH)-based inks for the gravure printing of high-dielectric-constant nanocomposite films.

scholarly journals Experimental Correlation between Nonlinear Optical and Magnetotransport Properties Observed in Au-Co Thin Films

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Kaida Yang ◽  
Victor Kryutyanskiy ◽  
Irina Kolmychek ◽  
Tatiana V. Murzina ◽  
R. Alejandra Lukaszew
Keyword(s):  
Thin Films ◽  
Growth Parameters ◽  
Magnetic Thin Films ◽  
Nanocomposite Films ◽  
Matrix Composition ◽  
Local Magnetization ◽  
Nonmagnetic Metal ◽  
Sensing Applications ◽  
Magnetic Metal ◽  
The Matrix

Magnetic materials where at least one dimension is in the nanometer scale typically exhibit different magnetic, magnetotransport, and magnetooptical properties compared to bulk materials. Composite magnetic thin films where the matrix composition, magnetic cluster size, and overall composite film thickness can be experimentally tailored via adequate processing or growth parameters offer a viable nanoscale platform to investigate possible correlations between nonlinear magnetooptical and magnetotransport properties, since both types of properties are sensitive to the local magnetization landscape. It has been shown that the local magnetization contrast affects the nonlinear magnetooptical properties as well as the magnetotransport properties in magnetic-metal/nonmagnetic metal multilayers; thus, nanocomposite films showcase another path to investigate possible correlations between these distinct properties which may prove useful for sensing applications.

scholarly journals Thin Films Based on Cobalt Phthalocyanine:C60 Fullerene:ZnO Hybrid Nanocomposite Obtained by Laser Evaporation

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 468
Author(s):  
Marcela Socol ◽  
Nicoleta Preda ◽  
Andreea Costas ◽  
Bogdana Borca ◽  
Gianina Popescu-Pelin ◽  
...  
Keyword(s):  
Thin Films ◽  
Zno Nanoparticles ◽  
Photovoltaic Effect ◽  
Inorganic Nanoparticles ◽  
Nanocomposite Films ◽  
C60 Fullerene ◽  
Laser Evaporation ◽  
Hybrid Nanocomposite ◽  
Absorption Bands ◽  
Nanocomposite Thin Films

Matrix-assisted pulsed laser evaporation (MAPLE) was used to deposit hybrid nanocomposite thin films based on cobalt phthalocyanine (CoPc), C60 fullerene and ZnO nanoparticles. The inorganic nanoparticles, with a size of about 20 nm, having the structural and optical properties characteristic of ZnO, were chemically synthesized by a simple precipitation method. Furthermore, ZnO nanoparticles were dispersed in a dimethyl sulfoxide solution in which CoPc and C60 had been dissolved, ready for the freezing MAPLE target. The effect of the concentration of ZnO nanoparticles on the structural, morphological, optical and electrical properties of the CoPc:C60:ZnO hybrid nanocomposite layers deposited by MAPLE was evaluated. The infrared spectra of the hybrid nanocomposite films confirm that the CoPc and C60 preserve their chemical structure during the laser deposition process. The CoPc optical signature is recognized in the ultraviolet–visible (UV–Vis) spectra of the obtained layers, these being dominated by the absorption bands associated to this organic compound while the ZnO optical fingerprint is identified in the photoluminescence spectra of the prepared layers, these disclosing the emission bands linked to this inorganic semiconductor. The hybrid nanocomposite layers exhibit globular morphology, which is typical for the thin films deposited by MAPLE. Current-voltage (J-V) characteristics of the structures developed on CoPc:C60:ZnO layers reveal that the addition of an appropriate amount of ZnO nanoparticles in the CoPc:C60 mixture leads to a more efficient charge transfer between the organic and inorganic components. Due to their photovoltaic effect, structures featuring such hybrid nanocomposite thin films deposited by MAPLE can have potential applications in the field of photovoltaic devices.

scholarly journals Surface Plasmon Resonance Responses of Au-SnOxNanocomposite Films

2009 ◽  
Vol 1208 ◽  
Author(s):  
Dongfang Yang
Keyword(s):  
Thin Films ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Incident Angle ◽  
Attenuated Total Reflection ◽  
Nanocomposite Films ◽  
Diffraction Field ◽  
X Ray ◽  
Nanocomposite Thin Films

AbstractAu-SnOxnanocomposite thin films composed of gold nanoparticles embedded in SnOxmatrix were prepared by pulsed laser deposition technique and their crystal structure, morphology and chemical composition were evaluated by low angle X-ray diffraction, field-emission scanning electron microscopy and x-ray photoelectron spectroscopy, respectively. For the nanocomposite films with high Au percentage, the surfaces of nanocomposite films are very smooth, while for the films with low Au percentage, the films consist of many embedded Au nanoparticles with particle size of 5-20 nm. The XRD results revealed that in the nanocomposite films Au existed in a polycrystalline phase while SnOxin an amorphous phase. Surface plasmon resonance (SPR) responses of the Au-SnOxnanocomposite thin films were investigated as functions of Au percentage and film thickness in the Kretschmann geometry of attenuated total reflection using a polarized light beam at the wavelength of 640 nm. The reflectance minima (SPR dip) of SPR responses of the Au-SnOxnanocomposite films appeared at higher values of incident angle than that of a pure Au film and as the Au percentage decreases the SPR angles shift to higher values and the widths also become broader. The potential use of Au-SnOxnanocomposite films for SPR gas sensing was discussed.

Vapour Deposited Nanocomposite Thin Films

1990 ◽  
Vol 181 ◽  
Author(s):  
L. S. Wen
Keyword(s):  
Thin Films ◽  
Vapour Deposition ◽  
Ion Beam ◽  
Nanocomposite Films ◽  
3 Dimensional ◽  
Nanocomposite Thin Films ◽  
Low Dimensionality ◽  
Low Dimensional ◽  
Basic Features ◽  
High Level

ABSTRACTFundamental principles of nanocomposites are discussed. The basic features of nanocomposites are low dimensionality of their composition components, widespreadness of the electronic interactions between the components and the great variety of microstructure of nanocomposites ranging from high level ordered 3-dimensional periodic structure to stochastically dispersed medium of superfine particle. All these offer much more potential for tailoring the property of materials than by formation of chemical compound or mixture including microcomposites. Vapour deposition enhanced by ion beam and electrical discharge plasma provides a class of versatile processes both for preparing low dimensional components of nanocomposites and for synthesizing nanocomposite film itself. Elements of designing nanocomposite thin films and their preparing by ion beam and plasma enhanced vapour deposition are also discussed. Examples of nanocomposite films are given.

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