• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.3
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• pp.183-188
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• 2002

Antibacterial glass ceramics composed of $5Li_2O{\cdot}36CaO{\cdot}20TiO_2{\cdot}27P_2O_5$ were Prepared. After ion exchange in the $AgNO_3$solution, crystallization phases were $AgTi_2(PO_4)_3$, $LiTi_2(PO_4)_3$ and $Ca_3(PO_4)_2$. In case of ion exchange, the crystallization phases started to be transformed from $LiTi_2(PO_4)_3$ to $AgTi_2(PO_4)_3$in 0.5 mole $AgNO_3$ solution and the transformation was almost completed in 1.0 mole. ion exchange rate of glass-ceramics powder, considering ion exchange time, was more fast than that of bulk. The bacteriostatic effect of the glass-ceramics on Staphyloroccus aureus and Salmonella typhi bacteria was more excellent than that of glass when the crystallization phase was transformed from LTP to AgTP.

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.90-92
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• 2008

본 논문에서는$xAg_2O$-(5-x)$Na_2O$-36CaO-$10TiO_2$-$19.5P_2O_5$ (mol ratio)의 유리조성으로부터 $Ag_2O$의 함량을 변화시켜 유리의 제조 및 특성평가를 하였다. 제조된 유리는 TG-DSC를 통하여 열적특성을 관찰하였으며, 항균특성은 staphylococcus aureus균주에 대하여 항균특성을 평가하였다. 평가결과 열적특성은 $Ag_2O$함량이 증가할수록 결정화온도가 낮아짐이 관찰되었고, 항균특성 역시 $Ag_2O$성분의 함량이 증가 할수록 항균특성이 증가하는 것으로 관찰되었다.

• Proceedings of the Optical Society of Korea Conference
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• 2001.08a
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• pp.34-35
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• 2001

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.222-223
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• 2002

• Carbon letters
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• v.16 no.4
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• pp.247-254
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• 2015

To improve photocatalytic efficiency, graphene/Ag/TiO₂ nanotube catalyst was synthesized, and its surface characteristics and photocatalytic activity investigated. For deposition of Ag nanoparticles on the TiO₂ nanotubes, a polymer compound containing CH₃COOAg/poly(L-lactide) was utilized, and the silver particles were precipitated by reducing the silver ions during the annealing process. Graphene deposition on the Ag/TiO₂ nanotubes was achieved using an electrophoretic deposition process. Based on the dye degradation results, it was determined that the photocatalytic efficiency was significantly affected by deposition of silver particles and graphene on the TiO₂ catalyst. Highly efficient destruction of the dye was obtained with the new graphene/Ag/TiO₂ nanotube photocatalyst. This may be attributed to a synergistic effect of the graphene and Ag nanoparticles on the TiO₂ nanotubes.

• Journal of the Korean Ceramic Society
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• v.22 no.3
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• pp.19-24
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• 1985

The phtoelectrochemical porperties of $Nb_2O_5$, $Sb_2O_3$ and $V_2O_5$ doped and pure $SrTiO_3$ ceramic electodes were investigated. Shapes of I-V and I-λ characteristics of the pure $SrTiO_3$ ceramic electrode are similar to those of SrTiO3 single crystal electorde ; the anodic current strats at -0.9V (vs. Ag/AgCI) in 1 N-NaOH aqueous solution and the photoresponse appears at a wavelength of about 390nm and the quantum efficiency is about 3.5% at wavelength of 390nm under 0.5V vs. Ag/AgCl. Photocurrents of $Nb_2O_5$, $Sb_2O_3$ and $V_2O_5$ doped electrodes and $V_2O_5$ doped ceramic electrode appears at wavelength of 390nm and 500nm respectively.

• Journal of the Korean Vacuum Society
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• v.12 no.S1
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• pp.88-91
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• 2003

Electromagnetic interference shielding and near-infrared cutoff filters for plasma display panel application were designed and fabricated by radio frequency magnetron sputtering. Three types of the filters were prepared: the basic structure of type A consisted of [$TiO_2$ Ti Ag $TiO_2$]; type B, of [$TiO_2$ ITO Ag $TiO_2$]; type C, of [$TiO_2$ ITO Ag ITO $TiO_2$]. Ti and ITO layers deposited on Ag layers were employed as barriers to prevent the oxidation and the diffusion of Ag film into the adjacent oxide layers. Optical, electrical, chemical, and structural properties were investigated, and the result shows that the filters with the ITO barrier layers provided an enhancement in transmittance in the visible owing to a lower absorption of ITO layers than Ti layers. Type C filter showed better optical and electrical performances and smoother surface roughness than Type B and C filters: the average sheet resistance was as low as 1.51 $\Omega\Box$ (where $\square$ stands for a square film), the peak transmittance in the visible was as high as 78.2 %, and the average surface roughness was 1.48 nm.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.1 no.1
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• pp.27-32
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• 2000

Porous glass ceramics composed of $Ag_2-Li_2O-CaO-TiO_2-P_2O_5$-CaO with 0.05-1.5 mole CuO were prepared by melting and 2 step heat treatment for nucleation at $610^{\circ}C$ and crystallization at $840^{\circ}C$. $\beta$-$Ca_3(PO_4)_2$crystal phase was selectively leached out in 1N-HC1 solution for 3 days, leaving $AgTi_2(PO_4)_3$and $LiTi_2(PO_4)_3$crystal phases. Antibacterial effects and characterizations of the porous glass ceramics were investigated. Staphylococcus aureus and Salmonella typhi bacteroa were used in this study. It was found that the resultant porous glass ceramics show excellent bacteriostatic properties.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.436-437
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• 2006

The $Ag/TiO_{2-x}N_x$ nanoparticles were synthesized by photochemical deposition in a $TiO_{2-X}N_X$ suspension system. The prepared products were characterized by means of XRD, Uv-vis and photoluminescence spectra (PL). Its photocatalytic activity was investigated by the decomposition of methylene blue (MB) solution under illumination of visible and ultraviolet light, respectively. Compared to $TiO_{2-x}N_x$, the photocatalytic activity of the as-prepared $Ag/TiO_{2-x}N_x$ is obviously enhanced due to the decreasing recombination of a photoexcitated electron-hole pairs. The Mechanism in which photocatalytic activity is enhanced has been discussed in detail.

• Journal of the Korean Chemical Society
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• v.63 no.4
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• pp.307-311
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• 2019