Article

1998 ◽  
Vol 76 (11) ◽  
pp. 1554-1558
Author(s):  
Troy AE Loss ◽  
Cerrie W Rogers ◽  
Michael O Wolf
Keyword(s):  
Thin Films ◽  
Weight Gain ◽  
Conducting Polymers ◽  
Composite Films ◽  
Photoluminescence Spectra ◽  
Composite Thin Films ◽  
X Ray

Composite thin films of poly(p-phenylenevinylene) and the polyelectrolyte Nafion have been prepared by the polymerization of 1,1prime-[(p-phenylene)bis(methylene)bis[tetrahydrothiophenium] dichloride electrostatically bound to Nafion. The composite films are strongly fluorescent. The absorption and photoluminescence spectra of the films have been measured and are similar to those of poly(p-phenylenevinylene). X-ray microanalysis and weight gain experiments performed on the films suggest that the dicationic monomer occupies less than 15% of the cation exchanging sites in the Nafion, leaving sites available for binding of additional small cations.Key words: thin films, conducting polymers, poly(p-phenylenevinylene), polyelectrolyte, photoluminescence.

Fabrication and Characterization of Hydroxyapatite-Magnesium Composite Thin Films on Magnesium Plates for Implant Applications

2012 ◽  
Author(s):  
Kwadwo Mensah-Darkwa ◽  
Ram K. Gupta ◽  
Dhananjay Kumar
Keyword(s):  
Thin Films ◽  
Potentiodynamic Polarization ◽  
Composite Coatings ◽  
Composite Films ◽  
Corrosion Current ◽  
Biological Properties ◽  
Cytotoxicity Test ◽  
Corrosion Properties ◽  
Composite Thin Films ◽  
X Ray

Hydroxyapatite (HA)-magnesium (Mg) composite thin films were grown on magnesium substrates using a multitarget pulsed laser deposition technique. The microstructural and corrosion properties of HA-Mg composite thin films were investigated using methods such as x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray (EDX) analysis, and potentiodynamic polarization. While the XRD studies have indicated the amorphous nature of the HA-Mg composite coating, SEM and EDX studies have shown that the composite films are stoichiometric. The potentiodynamic polarization study indicates that the corrosion of magnesium decreases with increase in the hydroxyapatite content in the composite film. The corrosion potential (Ecorr) and corrosion current density (Icorr) for the uncoated magnesium, 30HA-70Mg, and 50HA-50Mg coated magnesium are −1.59, −1.57, −1.54 V and 1.21×10−5, 1.38×10−6, 2.52×10−7 A/cm2, respectively. Preliminary cytotoxicity test conducted on the samples shows no adverse effect on human bone marrow stromal cells. The advantage of the composite coatings is the realization of adjustable corrosion and biological properties by a simple maneuvering of composition which in turn is realized by changing the number of laser pulses on a respective target.

scholarly journals X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 478
Author(s):  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
Yap Wing Fen ◽  
Silvan Saleviter ◽  
Narong Chanlek ◽  
Hideki Nakajima ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Functional Group ◽  
Optical Sensing ◽  
Composite Thin Films ◽  
Cobalt Ions ◽  
X Ray ◽  
Sensing Applications

In this study, X-ray photoelectron spectroscopy (XPS) was used to study chitosan–graphene oxide (chitosan–GO) incorporated with 4-(2-pyridylazo)resorcinol (PAR) and cadmium sulfide quantum dot (CdS QD) composite thin films for the potential optical sensing of cobalt ions (Co2+). From the XPS results, it was confirmed that carbon, oxygen, and nitrogen elements existed on the PAR–chitosan–GO thin film, while for CdS QD–chitosan–GO, the existence of carbon, oxygen, cadmium, nitrogen, and sulfur were confirmed. Further deconvolution of each element using the Gaussian–Lorentzian curve fitting program revealed the sub-peak component of each element and hence the corresponding functional group was identified. Next, investigation using surface plasmon resonance (SPR) optical sensor proved that both chitosan–GO-based thin films were able to detect Co2+ as low as 0.01 ppm for both composite thin films, while the PAR had the higher binding affinity. The interaction of the Co2+ with the thin films was characterized again using XPS to confirm the functional group involved during the reaction. The XPS results proved that primary amino in the PAR–chitosan–GO thin film contributed more important role for the reaction with Co2+, as in agreement with the SPR results.

Residual Stress in Sputtered Silicon Oxycarbide Thin Films

2011 ◽  
Vol 1299 ◽  
Author(s):  
Ping Du ◽  
I-Kuan Lin ◽  
Yunfei Yan ◽  
Xin Zhang
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Elevated Temperatures ◽  
Silicon Oxide ◽  
Composite Films ◽  
Deposition Process ◽  
Silicon Oxycarbide ◽  
X Ray ◽  
Curvature Measurement ◽  
Film Substrate

ABSTRACTSilicon carbide (SiC) has received increasing attention on the integration of microelectro-mechanical system (MEMS) due to its excellent mechanical and chemical stability at elevated temperatures. However, the deposition process of SiC thin films tends to induce relative large residual stress. In this work, the relative low stress material silicon oxide was added into SiC by RF magnetron co-sputtering to form silicon oxycarbide (SiOC) composite films. The composition of the films was characterized by Energy dispersive X-ray (EDX) analysis. The Young’s modulus and hardness of the films were measured by nanoindentation technique. The influence of oxygen/carbon ratio and rapid thermal annealing (RTA) temperature on the residual stress of the composite films was investigated by film-substrate curvature measurement using the Stoney’s equation. By choosing the appropriate composition and post processing, a film with relative low residual stress could be obtained.

pH-Switchable electroactive composite films of carboxylated multi-walled carbon nanotubes and Prussian blue

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103184-103188
Author(s):  
Ying Tong ◽  
Yuanyuan Wang ◽  
Bowen Gao ◽  
Lei Su ◽  
Xueji Zhang
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Prussian Blue ◽  
Composite Films ◽  
Ph Responsive ◽  
Composite Thin Films ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Here the combination of carboxylated multi-walled carbon nanotubes (CMWCNTs) and Prussian blue (PB) for fabricating pH-responsive electroactive composite thin films is reported.

scholarly journals Silica-Copper Oxide Composite Thin Films as Solar Selective Coatings Prepared by Dipping Sol Gel

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
E. Barrera-Calva ◽  
J. Méndez-Vivar ◽  
M. Ortega-López ◽  
L. Huerta-Arcos ◽  
J. Morales-Corona ◽  
...  
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Silica Matrix ◽  
Composite Thin Films ◽  
X Ray ◽  
Molar Ratios ◽  
Steel Substrates

Silica-copper oxide (silica-CuO) composite thin films were prepared by a dipping sol-gel route using ethanolic solutions comprised TEOS and a copper-propionate complex. Sols with different TEOS/Cu-propionate (Si/Cu) molar ratios were prepared and applied on stainless steel substrates using dipping process. During the annealing process, copper-propionate complexes developed into particulate polycrystalline CuO dispersed in a partially crystallized silica matrix, as indicated by the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses. The gel thermal analysis revealed that the prepared material might be stable up to400°C. The silica-CuO/stainless steel system was characterized as a selective absorber surface and its solar selectivity parameters, absorptance (α), and emittance (ε) were evaluated from UV-NIR reflectance data. The solar parameters of such a system were mostly affected by the thickness and phase composition of theSiO2-CuO film. Interestingly, the best solar parameters (α= 0.92 andε= 0.2) were associated to the thinnest films, which comprised a CuO-Cu2Omixture immersed in the silica matrix, as indicated by XPS.

Influence of gold species (AuCl4−and AuCl2−) on self-assembly of PS-b-P2VP in solutions and morphology of composite thin films fabricated at the air/liquid interfaces

2016 ◽  
Vol 18 (3) ◽  
pp. 1945-1952 ◽  
Author(s):  
Xingjuan Zhao ◽  
Qian Wang ◽  
Xiaokai Zhang ◽  
Yong-Ill Lee ◽  
Hong-Guo Liu
Keyword(s):  
Thin Films ◽  
Block Copolymers ◽  
Self Assembly ◽  
Adsorption Process ◽  
Composite Films ◽  
Liquid Interface ◽  
Liquid Interfaces ◽  
Composite Thin Films ◽  
Functional Composite ◽  
Air Liquid Interface

A new and facile approach was developed to fabricate functional composite films of block copolymers at the air/liquid interface through a self-emulsification, self-assembly and adsorption process.

Preparation and Properties of the Novel Nanocrystal and Polymer Composite Films for Electro-Optic Applications

2003 ◽  
Vol 785 ◽  
Author(s):  
Quan Ren ◽  
Dong Xu ◽  
Yuktak Chow ◽  
Hauping Chan ◽  
Paklim Chu
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Polymer Composite ◽  
Room Temperature ◽  
Composite Films ◽  
Polymer System ◽  
Weight Ratio ◽  
Composite Thin Films ◽  
Coupling System ◽  
Electro Optic

ABSTRACTNovel nanocrystals and polymer composite thin films for the applications of electro-optical devices were prepared. We used PbTiO3 nanocrystals as a nonlinear chromophore (guest) in the NLO polymer system. The transparent polymer polyetherketone (PEK-c) was chosen as the polymer host due to its high glass transition temperature. The PbTiO3 nanocrystals were synthesized successfully by the chemical solution decomposition method. The size of the PbTiO3 nanocrystals was estimated to be 30–40 nm. The weight ratio of PbTiO3 nanocrystals to polymer polyetherketone was 15 %. The composite thin films of PbTiO3 / PEK-c were prepared by spin-coating technique. The films were then electrically poled to induce asymmetry in the material by heating the films to a temperature close to their glass transition and applying an electric field. The refractive indices of the un-poled composite PbTiO3 / PEK-c film were found to be 1.55165 for 633 nm and 1.65352 for 414 nm by using the Metricon prism coupling system. In the poled composite PbTiO3 / PEK-c film sample, the TE- and TM-indices differences were found to be 0.02945 for 633 nm and 0.03915 for 414 nm, showing very good optical anisotropy properties. Dielectric constant ε of the film was determined to be 7.32 at room temperature at 100 KHz using an Impedance Analyzer. The electro-optic coefficient, γ33, of poled PbTiO3 / PEK-c composite film was measured to be 18.34 pm/Vat 633 nm under room temperature by the simple transmission technique. The factor F2 = n7 γ2 /ε, figures of merit, was estimated to be 1546. The relaxation time constant was calculated to be 5836 min.

Hydrophilic Properties of TiO2-Al2O3 Composite Thin Films

2005 ◽  
Vol 475-479 ◽  
pp. 3897-3900
Author(s):  
Qing Ju Liu ◽  
Jin Zhang ◽  
Zhongqi Zhu ◽  
Yingxia Jin ◽  
Qing Hui Wang
Keyword(s):  
Thin Films ◽  
Doping Concentration ◽  
Sol Gel ◽  
Composite Films ◽  
Film Surface ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Composite Thin Films ◽  
Al2o3 Composite ◽  
Al2o3 Doping

TiO2-Al2O3 composite thin films were fabricated on soda-lime glass with sol-gel technology. By measuring the contact angle of water with the film surface and the analysis of the XRD and XPS, we studied the influence of Al2O3 doping concentration and film thickness on the hydrophilicity of the composite films. The results indicate that the doping of Al2O3 into TiO2 and the relatively large thickness of the films can improve their hydrophilicity.

Gamma irradiation studies of composite thin films of poly vinyl alcohol and coumarin

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1554-1561 ◽  
Author(s):  
Feroz A. Mir ◽  
Adil Gani ◽  
K. Asokan
Keyword(s):  
Thin Films ◽  
Gamma Irradiation ◽  
Vinyl Alcohol ◽  
Composite Films ◽  
Poly Vinyl Alcohol ◽  
Solution Casting ◽  
Casting Method ◽  
Composite Thin Films ◽  
Solution Casting Method

Composite films of imperatorin (a coumarin molecule) and poly vinyl alcohol (PVA) are prepared by a solution casting method.

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