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ICMCTF 2012! - CD-Lab Application Oriented Coating Development

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amorphous structure with a smooth surface morphology. The Zn2SiO4:Mn<br />

films became crystalline after annealing at 800 °C and the crystallinity of<br />

the films was continuously improved up to 1200 °C. The annealed<br />

Zn2SiO4:Mn films had a polycrystalline rhombohedral structure with no<br />

preferred crystallographic orientation of the crystallites. The<br />

photoluminescence spectra of the annealed Zn2SiO4:Mn films showed<br />

broad-band emissions with a peak maximum at around 523 nm in the green<br />

range. The PL emission intensity was enhanced as the annealing<br />

temperature increased, resulting from the improvement of the crystallinity<br />

of the Zn2SiO4:Mn films. The excitation band exhibited a peak maximum at<br />

243 nm in the near ultraviolet region, which was considered to be associated<br />

with the charge transfer transition of divalent manganese ion in the Zn2SiO4<br />

system.<br />

CP-31 Er:Si Silicide Formation and Temperature Dependence of<br />

Barrier Inhomogeneity, H. Efeoglu (hefeoglu@atauni.edu.tr), Turkey, Y.<br />

Babacan, Erzincan University, Turkey<br />

Stabilized metal silicides with low barrier for ohmic contact or high barrier<br />

for rectification has advantages for nanometer scaled device fabrication.<br />

The use of silicide instead of impurity doped silicon for drain and source<br />

has advantages in terms of processing temperature and much less trap<br />

creation during the fabrication. Ultra shallow junction can be formed easily<br />

with the metals having low diffusion coefficient in silicon. Low barrier of<br />

metal-silicide on source/drain is key point for ultrascaled complementary<br />

metal/oxide/semiconductors in future technology. On the other side<br />

Schottky barrier as a gate terminal may suffer from barrier inhomogeneity.<br />

Because of that, much better performance of SB require careful I-V analysis<br />

which gives some of suggestions related to material selection and<br />

fabrication parameters. Inhomogeneity of Schottky barrier at room<br />

temperature widely studied during the last decade. In this study, the<br />

temperature dependence of barrier distribution below room temperature<br />

presented for the first time.<br />

With this context, the rectification effect of Er-silicide on p-Si was<br />

investigated. Sputter tehnique is used for deposition and Er-Silicide<br />

thermally activated by annealing above 300 ºC under the nitrogen<br />

atmosphere. I-V-T measurement of multiple diodes was analysed for the<br />

barrier inhomogeneity of Er-Silicide/p-Si junctions.<br />

<strong>Coating</strong>s for Biomedical and Healthcare <strong>Application</strong>s<br />

Room: Golden Ballroom - Session DP<br />

Symposium D Poster Session<br />

DP-1 Characterization and antibacterial performance of<br />

biocompatible Ti-Zn-O coatings deposited on titanium implants, M.T.<br />

Tsai, Hungkuang University, Taiwan, Y.Y. Chang<br />

(yinyu@mail2000.com.tw), National Formosa University, Taiwan, Y.C.<br />

Chen, MingDao University, Taiwan, H.L. Huang, J.T. Hsu, China Medical<br />

University, Taichung, Taiwan<br />

Titanium(Ti)-based materials have been used for dental/orthopedic implants<br />

due to their excellent biological compatibility, superior mechanical strength<br />

and high corrosion resistance. A better anti-bacterial performance of Ti<br />

implant is beneficial for the osseointegration and for avoiding the infection<br />

after implantation surgery. Bacterial colonization may also be prevented or<br />

reduced by different surface properties of the material and/or by the use of<br />

antiseptic surface coatings. Titanium and zinc oxides have attracted wide<br />

interest because of their good photocatalytic activity, high stability,<br />

antibacterial property and non-toxicity. In this study, biocompatible Ti-Zn-<br />

O coatings with different Zn contents were deposited on a bio-grade pure Ti<br />

implant material by using a cathodic-arc evaporation system with plasma<br />

enhanced duct equipment. Pure Ti and Zn cathodes were used for the<br />

deposition. Characterized by X-ray diffraction (XRD), X-ray photoelectron<br />

spectroscopy(XPS) and scanning electron microscopy (SEM), the crystal<br />

structure, bonding state and surface morphology of the deposited crystalline<br />

Ti-Zn-O were studied. To verify the susceptibility of implant surface to<br />

bacterial adhesion, Actinobacillus actinomycetemcomitans (A.<br />

actinomycetemcomitans) and Staphylococcus aureus (S. aureus), found<br />

frequently in the implant-associated infections, was chosen for in vitro antibacterial<br />

analyses by a fluorescence staining method employing Syto9 and<br />

bacterial viability agar tests. In addition, the biocompatibility of human<br />

gingival fibroblast (HGF) and human primary osteoblasts (hOBs) cells on<br />

the coatings was also evaluated. The results suggested that the Ti-Zn-O<br />

coatings can improve antibacterial performance with compatible soft-tissue<br />

and hard-tissue biological performances.<br />

DP-2 Anti-bacterial Performance of Zirconia <strong>Coating</strong>s on Titanium<br />

Implants, H.L. Huang, China Medical University, Taichung, Taiwan, Y.Y.<br />

Chang (yinyu@mail2000.com.tw), National Formosa University, Taiwan,<br />

J.C. Weng, Y.C. Chen, MingDao University, Taiwan, C.H. Lai, T.M. Shieh,<br />

China Medical University, Taichung, Taiwan<br />

Bacterial adhesion and colonization are considered to play a key role in the<br />

pathogenesis of peri-implant disease, an inflammatory process leading to<br />

soft and hard tissue destruction around a Ti implant. The osseointegration of<br />

titanium implants is related to their composition and surface treatment.<br />

Zirconia coatings have been proved to increase their applications in the<br />

biomedical fields such as orthopedic devices and dental implants by<br />

improving implant osseointegration. In this study, doped ZrO2 coatings with<br />

different Ag and Cu contents were deposited on bio-grade pure Ti implant<br />

materials. A twin-gun magnetron sputtering system was used for the<br />

deposition of the ZrO2-Ag(Cu) coating. The Ag and Cu contents in the<br />

deposited coatings were controlled by the magnetron power and bias<br />

voltage. The films were then annealed using rapid thermal annealing (RTA)<br />

at 350 ° C for 8 min to induce the nucleation and growth of Ag(Cu) particles<br />

on the film surface. WDS was used to characterize the composition of the<br />

deposited ZrO2-Ag(Cu) coatings. The crystalline structure and bonding<br />

states of the coatings were analyzed by XRD and XPS. The antibacterial<br />

behavior will vary, depending on the amount and size of the Ag(Cu)<br />

particles on the coated Ti sample. In this study, Actinobacillus<br />

actinomycetemcomitans (A. actinomycetemcomitans) and Staphylococcus<br />

aureus (S. aureus) found frequently in the implant-associated infections,<br />

were chosen for in vitro anti-bacterial analyses by a fluorescence staining<br />

method employing Syto9 and bacterial viability agar tests. The antibacterial<br />

activity was quantified as the fluorescence detected at 488 nm by an ELISA<br />

(enzyme-linked immunosorbent assay). It showed that the nanostructure and<br />

Ag and Cu contents of the ZrO2-Ag(Cu) coatings were correlated with the<br />

antibacterial performance.<br />

DP-3 Diffusion mechanism and Ag + release kinetics on ZrCN - Ag NPs<br />

antimicrobial coatings, S. Calderon V. (secave44@gmail.com),<br />

Universidade do Minho, Dept. Física, Portugal, R. Escobar Galindo,<br />

Instituto de Ciencia de Materiales de Madrid (ICMM -CSIC), Spain, A.<br />

Cavaleiro, University of Coimbra, Portugal, S. Carvalho, Universidade do<br />

Minho, Dept. Física, Portugal<br />

Silver nanoparticles (NPs) have been extensively used to provide<br />

antibacterial properties to several commercial devices such as sportswear,<br />

toys and baby articles, among others. In fact, numerous reports have been<br />

published during the last few years regarding silver NPs attaining<br />

antimicrobial properties in countless kinds of materials and for a<br />

considerably good number of microorganisms. However, the durability of<br />

this effect is ignored in most of those reports, precluding their use in long<br />

term applications. Thus, this effect gains particular importance when<br />

dealing with applications involving the human body: the so-called<br />

biomaterials.<br />

In this work ZrCN coatings doped with Ag NPs were produced on SS316L<br />

by unbalance magnetron sputtering using two targets, Zr and Zr/Ag in an<br />

Ar, C2H2, N2 atmosphere. In order to investigate the evolution of silver<br />

dissolution and the corrosion resistance, these ZrCN with Ag NP’s were<br />

immersed for different periods of time, on three different electrolytes.<br />

0.89% NaCl and phosphate buffer saline (PBS) with and without proteins (<br />

1.0 g/l bovine serum albumin ) were used to simulate the human body<br />

fluids. The former was selected due to its simplicity which permits to avoid<br />

the signal from other components in order to determine the kinetic<br />

mechanisms of the silver ions release. However, the latters were utilized in<br />

order to understand the influence of phosphates and proteins in this process.<br />

Inductively coupled plasma optical emission spectrometry (ICP-OES) was<br />

used to determine the content of silver ions in the electrolytes, as a function<br />

of the immersion time. Electrochemical impedance spectroscopy (EIS) and<br />

potentiodynamics curves were used to evaluated the electrochemical<br />

response of the samples. A profile evaluation of the films before and after<br />

immersion was methodically carried out by means of glow discharge optical<br />

emission spectroscopy (GDOES). Structural and morphological<br />

characterizations were carried out by X-ray diffraction (XRD) and Scanning<br />

electron microscopy (SEM), respectively. Finally, morphological and<br />

structural characterization, silver content evolution and electrochemical<br />

response have been correlated, and a model containing information about<br />

morphology, structure and ions kinetics is performed.<br />

DP-4 Controlling the drug release from biocompatible polymers by<br />

changing plasma-treated area, K. Hagiwara, Keio University, Japan, T.<br />

Hasebe, Toho University Sakura Medical center, Japan, R. Asakawa, Keio<br />

University, Japan, A. Kamijo, Yokohama City University Hosptital, Japan,<br />

T. Suzuki, A. Hotta (hotta@mech.keio.ac.jp), Keio University, Japan<br />

In this study, plasma surface treatment was introduced as a method for<br />

controlling the drug release. Currently, the implantation of DES with<br />

surface coating of a drug-containing polymer, is the most powerful way to<br />

109 Thursday Afternoon Poster Sessions

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