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오도현,Chan Ho Yoo,노영수,김수연,김태환,조운조,김진영 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
ZnO nanostructures were formed on the Al doped ZnO (AZO)/Ag/AZO multilayer film coated flexible polyethersulfone (PES) substrates at low temperature by using an electrochemical deposition method. The resistivity of the AZO/Ag/AZO multilayer films decreased with increasing thickness of the Ag film. X-ray diffraction patterns for the ZnO nanostructures showed that the crystal structure of the ZnO was hexagonal wurtzite and that the orientation was along the c-axis perpendicular to the substrate. Scanning electron microscopy images showed that the ZnO nanostructures grown at current densities of -1.0 and -1.5 mA/cm<SUP>2</SUP> were ZnO nanorods with a diameter 150 nm and ZnO nanoflowers with a planar dimension, respectively. Photoluminescence spectra showed that the band-edge emission peak of the ZnO nanostructures dominantly appeared at the ultraviolet region. These results showed that the ZnO nanorods and nanoflowers with a high quality were synthesized on AZO/Ag/AZO multilayer films coated PES substrates.
오도현,안준성,조윤조,김태환 한국물리학회 2014 Current Applied Physics Vol.14 No.7
Thin film transistors (TFTs) with indiumezinc tin-oxide (IZTO) dual-channel layers were fabricated on heavily-doped p-type Si substrates by using a tilted dual-target radio-frequency magnetron sputtering system. The number of oxygen vacancies in the IZTO channel layer decreased with increasing oxygen partial pressure, resulting in a decrease in the conductivity. The threshold voltage (Vth) shifted toward positive gate-source voltage with increasing oxygen partial pressure for the growth of the IZTO layer because of a decrease in the carrier concentration. The Vth, the mobility, the on/off-current ratio, and the subthreshold swing of the dual-channel IZTO TFTs were 3.5 V, 7.1 cm2/V s, 1.3 V/decade, and 8.2 106, respectively, which was enhanced by utilizing dual-channel layers consisting of a top channel deposited at a high oxygen partial pressure and a bottom channel deposited at a low oxygen partial pressure.
Do-Hyun Oh(오도현),Soo Kyung Han(한수경),Young-Hyun Ryu(류영현),Guk-Young Ahn(안국영),Inseong Choi(최인성),Sung-Wook Choi(최성욱) 한국고분자학회 2022 폴리머 Vol.46 No.6
다공성 막을 중간층으로 갖는 폴리디메틸실록산 미세유체칩을 이용하여 항암 약물인 독소루비신을 함유한 지질나노입자를 연속적인 공정으로 제조하였다. 불연속상으로는 지질, 독소루비신, 및 라우릭 산을 함유한 에탄올상을, 연속상으로는 증류수를 각각 시린지펌프를 이용하여 미세유체칩에 투입하였다. 작은 기공을 갖는 다공성막을 사용하고, 연속상의 유속이 높을 수록 작은 지질나노입자가 제조되었다. 라우릭 산은 지질나노입자의 콜로이드 안정성을 증가시켜 주었고, 독소루비신과 라우릭 산의 첨가는 HeLa 암세포주에서 높은 세포 독성을 나타내었다. 이러한 미세유체칩은 다른 약물은 물론, mRNA와 siRNA를 함유한 지질나노입자제조에 응용될 수 있다. A polydimethylsiloxane (PDMS) microfluidic device containing a porous membrane as a middle layer was fabricated to continuously produce lipid nanoparticles (LNPs). Ethanol with lipids and water were used as discontinuous and continuous phases. Doxorubicin and lauric acid were added in the ethanol phase for tumor therapy and LNP stability. The smaller LNPs were prepared at the higher flow rate of the continuous phase by using the membrane with smaller pore size. The LNPs with a size of 87.6±3.84 nm were obtained at 0.3 mL/min of the flow rate of the continuous phase by using the membrane with a pore size of 0.02 μm. The addition of lauric acid enhanced the colloidal stability of LNPs. In addition, the LNPs with doxorubicin and lauric acid exhibited lower viability for HeLa cells and enhanced colloidal stability of LNPs. The microfluidic device with a porous membrane can be used as a general platform for the continuous production of LNPs containing mRNA, siRNA, and other therapeutic agents.