Nanomechanical Properties of UV Degraded TiO2/Epoxy Nanocomposites

2004 ◽  
Vol 841 ◽  
Author(s):  
Stephanie Scierka ◽  
Peter L. Drzal ◽  
Amanda L. Forster ◽  
Stephanie Svetlik
Keyword(s):  
Thin Films ◽  
Volume Fraction ◽  
Surface Region ◽  
Chemical Oxidation ◽  
Nanocomposite Films ◽  
Attenuated Total Reflectance ◽  
Integrating Sphere ◽  
Scanning Calorimetry ◽  
Nanocomposite Thin Films ◽  
Instrumental Indentation

ABSTRACTModel epoxy nanocomposite thin films containing one of three types of titanium dioxide (TiO2) particles were degraded using an integrating sphere-based ultraviolet weathering chamber. Instrumental Indentation Testing (IIT) was used to measure nanomechanical changes in the surface region of thin films resulting from UV exposure. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Differential Scanning Calorimetry (DSC) were used to support the mechanical results with chemical and thermal data. The unfilled epoxy was the most photosensitive sample tested, exhibiting the highest rates of chemical oxidation, the largest decrease in the glass transition (Tg), and the greatest increase in elastic modulus with increased exposure. Similar trends were observed in the nanocomposite films, but the rates of change were much lower than the unfilled epoxy and decreased with increasing volume fraction of nanoparticles.

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 Properties of Nanocomposite Thin-Films

2006 ◽  
Author(s):  
Anna Garahan ◽  
Laurent Pilon ◽  
Juan Yin ◽  
Indu Saxena
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Maxwell’S Equations ◽  
Maxwell's Equations ◽  
Volume Fraction ◽  
Effective Index ◽  
Absorption Index ◽  
Index Of Refraction ◽  
Nanocomposite Thin Films ◽  
Effective Index Of Refraction

This paper aims at developing numerically validated models for predicting the through-plane effective index of refraction and absorption index of nanocomposite thin-films. First, models for the effective optical properties are derived from previously reported analysis applying the volume averaging theory (VAT) to the Maxwell's equations. The transmittance and reflectance of nanoporous thin-films are computed by solving the Maxwell's equations and the associated boundary conditions at all interfaces using finite element methods. The effective optical properties of the films are retrieved by minimizing the root mean square of the relative errors between the computed and theoretical transmittance and reflectance. Nanoporous thin-films made of SiO2 and TiO2 consisting of cylindrical nanopores and nanowires are investigated for different diameters and various porosities. Similarly, electromagnetic wave transport through dielectric medium with embedded metallic nanowires are simulated. Numerical results are compared with predictions from widely used effective property models including (1) Maxwell-Garnett Theory, (2) Bruggeman effective medium approximation, (3) parallel, (4) series, (5) Lorentz-Lorenz, and (6) VAT models. Very good agreement is found with the VAT model for both the effective index of refraction and absorption index. Finally, the effect of volume fraction on the effective complex index of refraction predicted by the VAT model is discussed. For certain values of wavelengths and volume fractions, the effective index of refraction or absorption index of the composite material can be smaller than that of both the continuous and dispersed phases. These results indicate guidelines for designing nanocomposite optical materials.

Optical Properties of Ag Nanoparticles Embedded Ba0.5Sr0.5TiO3 Films Prepared by Alternating Pulsed Laser Deposition

2006 ◽  
Vol 6 (11) ◽  
pp. 3426-3428
Author(s):  
Ji-Suk Kim ◽  
Kyeong-Seok Lee ◽  
Sang Sub Kim
Keyword(s):  
Pulsed Laser Deposition ◽  
Volume Fraction ◽  
Pulsed Laser ◽  
Fused Silica ◽  
Laser Deposition ◽  
Nanocomposite Films ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
Ag Particles ◽  
Nanocomposite Thin Films

Nanocomposite thin films consisting of nanometer-sized Ag particles embedded in amorphous Ba0.5Sr0.5TiO3 matrix were prepared on fused silica substrates by an alternating pulsed laser deposition method. Their optical nonlinearities have been studied using the Z-scan method. The surface plasmon resonance (SPR) peak shifts to red and increases with the increasing the volume fraction of Ag in the nanocomposite films. The magnitude of the third-order nonlinear susceptibility of the nanocomposite with an Ag volume fraction of 3.3% was calculated to be ∼2 × 10−8 esu at the SPR wavelength.

Size-controlled growth and antibacterial mechanism for Cu:C nanocomposite thin films

2017 ◽  
Vol 19 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Amjed Javid ◽  
Manish Kumar ◽  
Seokyoung Yoon ◽  
Jung Heon Lee ◽  
Jeon Geon Han
Keyword(s):  
Thin Films ◽  
Antibacterial Activity ◽  
Volume Fraction ◽  
Size Reduction ◽  
Antibacterial Mechanism ◽  
Cu Nanoparticles ◽  
Plasma Energy ◽  
Fixed Volume ◽  
Nanocomposite Thin Films ◽  
Size Controlled

Plasma energy induced size reduction of Cu nanoparticles (at fixed volume fraction) in C matrix demonstrated effective antibacterial activity.

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.

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 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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