• Title/Summary/Keyword: Spin-Coating

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Sol-gel Spin-coating of ZnO Co-doped with (F, Ga) as A Transparent Conducting Thin Film ((F, Ga) 코도핑된 ZnO 투명 전도 박막의 솔-젤 제조와 특성)

  • Nam, Gil Mo;Kwon, Myoung Seok
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.1
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    • pp.91-95
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    • 2014
  • (F,Ga) co-doped ZnO thin film on glass substrate was fabricated via a simple non-alkoxide sol-gel spin-coating. Contrary to the F single doped ZnO thin film, the (F,Ga) co-doped thin film showed a significant reduce in electrical resistivity after a second post-heat-treatment in reducing environment. The resulting decrease in electrical resistivity with Ga co-doping is considered to be resulted from the increases both carrier density and mobility. The optical transmittance of the (F,Ga) co-doped thin film in the visible range showed higher transmittance with Ga co-doping compared with F single doped ZnO thin film.

Effects of Scratching on the Surface of Protein Chip Plates (단백질 칩 기판의 표면 스크래칭 효과)

  • Hyun, June-Won;Hwang, Jeong-Il
    • Journal of the Korean institute of surface engineering
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    • v.40 no.2
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    • pp.98-102
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    • 2007
  • [ $NiCl_2$ ] and poly-L-lysine coated protein chip plates have been fabricated using a spin coating system. Water has been used as solvent and scratching effects on glass slides and ITO have been investigated. We also observed the surface properties of $NiCl_2$ and poly-L-lysine coated slides by using PSA(Particle size analyzer) and AFM(Atomic force microscope). The AFM results imply that the surface patterns created in the spin coating system determine the protein adsorption. Adsorption of histidine-tagged KRS proteins immobilized on glass slides and ITO was analyzed using a BAS image system. The results suggest that the scratching effect was increased ability of protein adsorption.

Optimization of MIL-53 Metal-organic Framework Coatings for Enhanced Durability in Carbon Dioxide Capture (이산화탄소 포집 성능 향상을 위한 MIL-53 금속-유기 골격체 코팅의 최적화)

  • Dae-Hyeon Kim;Sung-Jun Lee;Dong-Gyu Ahn;Chang-Lae Kim
    • Transactions of Materials Processing
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    • v.33 no.4
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    • pp.261-269
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    • 2024
  • This study aimed to optimize the MIL-53 metal-organic framework coatings for enhanced durability in carbon dioxide capture applications. We synthesized MIL-53 powders using a hydrothermal method and deposited them on stainless-steel substrates by spin coating at various speeds, ranging from 300 to 2,000 rpm. The microstructure, surface properties, and tribological characteristics of the coatings were analyzed systematically. The results indicated that the spin speed significantly impacted the coating uniformity and defect formation. Coatings prepared at moderate speeds of 500 to 1,000 rpm exhibited optimal thickness and density, resulting in superior wear resistance. The tribological tests revealed that the coatings prepared at 700 to 1000 rpm had the lowest wear rates. These findings offer valuable insights for the development of durable MOF-based coatings for carbon dioxide capture and other applications requiring long-term stability under mechanical stress.

Investigation on the polystyrene surface coating method of graphene oxide (산화그래핀(GO)의 플라스틱(PS) 표면 코팅방법에 대한 연구)

  • Park, Jaebum;Lee, Jihoon;Huh, Jeung Soo;Park, Danbi;Lim, Jeong Ok
    • Journal of the Korean institute of surface engineering
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    • v.54 no.2
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    • pp.77-83
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    • 2021
  • In this study, we investigated various coating methods of graphene oxide on the surface of a petri dish made of polystyrene and analyzed the physical and chemical properties of the coated surface. For coating, spinning, spraying and pressing methods were attempted. The coated surface was characterized by SEM, Raman Spectroscopy, AFM, FT-IR, UV-Vis Spectroscopy and Contact Angle measurement. By spin coating and spray coating, well distributed graphene oxide in the form of multiple islands on the plastic surface with an average size of 5 to 20㎛ are observed by SEM, and high binding energy between graphene oxide and plastic surface is measured by AFM. In case of hand press coating, graphene oxide of 10㎛ or more was observed, and low surface energy was measured. By FT-IR and Raman Spectroscopy analysis, surface coating of graphene oxide was confirmed.

Solid solubility of carbon in TiZrN coating by paste deposition methods for laser carburization (레이저 침탄에서 페이스트 증착방식에 따른 TiZrN 코팅의 carbon solid solubility)

  • Lee, Sungchul;Kim, Seonghoon;Kim, Jaeyoung;Kim, Bae-Yeon;Lee, Heesoo
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.30 no.1
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    • pp.7-11
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    • 2020
  • Carbon solubility on the paste deposition methods in the carbon-doped TiZrN coating was investigated in terms of lattice distortion and atomic concentration. After depositing the carbon paste by the dip coating, spin coating and screen printing, the laser was ablated to form the carbon gradient layer. Thickness and the concentration of doped carbon depended on the paste deposition method. Crystal structure analysis indicated that more lattice distortion occurred when coating layers were doped with spin coating and screen printing than when coating layers were doped with dip coating. The XPS depth profile showed that the thickness of carbon gradient layer by dip coating was about 30 nm, spin coating and screen printing are approximately 100 nm, formed more gradient layer. The hardness before laser carburization was about 30 GPa, and the hardness of 31 GPa with dip coating and 37 GPa with spin coating and screen printing. It was indicated that paste deposition methods for laser carburization contributed to lattice distortion and gradient layer.

Improvement of Inverted Hybrid Organic Light-emitting Diodes Properties with Bar-coating Process (바코팅 공정을 이용한 유기 발광 다이오드 특성 향상)

  • Kwak, Sun-Woo;Yu, Jong-Su;Han, Hyun-Suk;Kim, Jung-Su;Lee, Taik-Min;Kim, Inyoung
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.6
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    • pp.589-595
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    • 2013
  • Solution processed conjugated molecules enable to manufacture various electronic devices by unconventional and cost effective patterning methods as screen or gravure printing. Spin-coating is the most popularly used method to form conjugated polymeric film for various electronic devices. The coating method has certain disadvantages such as a large amount of unwanted wastes, difficulty forming a film with a large area, and impossible to apply roll-to-roll manufacturing. We present here a promising alternative coating method, bar-coating for conjugated polymer film and OLED with the bar coated light emitting layer. In this papers, we show atomic force microscope images of spin- and bar-coated Poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) films on substrate. The bar-coated film showed a slight lower RMS roughness (1.058 [nm]) than spin-coated film (1.767 [nm]). It means the bar-coating is suitable method to form light emitting layers in OLEDs. By using bar-coating process, an OLED obtained with 4.7 [cd/A] in maximum current efficiency.

Fabrication of Porous Polytetrafluoroethylene thin Film from Powder Dispersion-solution for Energy Nanogenerator Applications (Polytetrafluoroethylene 분말 현탁액을 통한 다공성 박막 제조 및 에너지 발생소자 응용)

  • Park, Il-Kyu
    • Journal of Powder Materials
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    • v.24 no.2
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    • pp.102-107
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    • 2017
  • Porous polytetrafluoroethylene (PTFE) thin films are fabricated by spin-coating using a dispersion solution containing PTFE powders, and their crystalline properties are investigated after thermal annealing at various temperatures ranging from 300 to $500^{\circ}C$. Before thermal annealing, the film is densely packed and consists of many granular particles 200-300 nm in diameter. However, after thermal annealing, the film contains many voids and fibrous grains on the surface. In addition, the film thickness decreases after thermal annealing owing to evaporation of the surfactant, binder, and solvent composing the PTFE dispersion solution. The film thickness is systematically controlled from 2 to $6.5{\mu}m$ by decreasing the spin speed from 1,500 to 500 rpm. A triboelectric nanogenerator is fabricated by spin-coating PTFE thin films onto polished Cu foils, where they act as an active layer to convert mechanical energy to electrical energy. A triboelectric nanogenerator consisting of a PTFE layer and Al metal foil pair shows typical output characteristics, exhibiting positive and negative peaks during applied strain and relief cycles due to charging and discharging of electrical charge carriers. Further, the voltage and current outputs increase with increasing strain cycle owing to accumulation of electrical charge carriers during charge-discharge.

Protein Adsorption on the Nickel-coated Glass Slide for Protein Chips

  • Hyun, June-Won;Kim, Shi-Yong;Lee, Sang-Hee;Park, Heon-Yong;Pyee, Jae-Ho;Kim, Sung-Hoon
    • Bulletin of the Korean Chemical Society
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    • v.23 no.12
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    • pp.1724-1728
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    • 2002
  • The adsorption of proteins on the surface of glass slides is essential for the construction of protein chips. Here, we report that a Histidine (His)-tagged protein protein has been efficiently adsorbed on glass coated with nickel. A variety of nickel chloride-coated plates were prepared by the spin-coating method and adsorbed to the His-tagged protein. When the protein was adsorbed onto the surface of a variety of nickel chloride-coated glass slides, the efficiency of protein adsorption was dependent upon the coating conditions such as nickel chloride concentration, the spin speed and the drying temperature. The slides appropriate for protein adsorption were obtained when the slides were coated with 11%(w/w) of $NiCl_2$ at the spin speed of 4000 rpm for 20 sec and then dried at higher than 40°C. The physical properties of their nickel chloride thin layer were characterized by scanning electron microscopy. x-ray diffraction and atomic force microscopy, finding that the nickel chloride particles were around 10 nm in diameter and uniformly crystallized at 101 faces. These results show that nickel chloride-coated slides prepared by the spin-coating method are utilizable for the construction of Histagged protein chips.

Indium Sulfide and Indium Oxide Thin Films Spin-Coated from Triethylammonium Indium Thioacetate Precursor for n-Channel Thin Film Transistor

  • Dao, Tung Duy;Jeong, Hyun-Dam
    • Bulletin of the Korean Chemical Society
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    • v.35 no.11
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    • pp.3299-3302
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    • 2014
  • The In2S3 thin films of tetragonal structure and In2O3 films of cubic structure were synthesized by a spin coating method from the organometallic compound precursor triethylammonium indium thioacetate ($[(Et)_3NH]^+[In(SCOCH_3)_4]^-$; TEA-InTAA). In order to determine the electron mobility of the spin-coated TEA-InTAA films, thin film transistors (TFTs) with an inverted structure using a gate dielectric of thermal oxide ($SiO_2$) was fabricated. These devices exhibited n-channel TFT characteristics with a field-effect electron mobility of $10.1cm^2V^{-1}s^{-1}$ at a curing temperature of $500^{\circ}C$, indicating that the semiconducting thin film material is applicable for use in low-cost, solution-processed printable electronics.

Fabrication of PZT Film by a Single-Step Spin Coating Process

  • Oh, Seung-Min;Kang, Min-Gyu;Do, Young-Ho;Kang, Chong-Yun;Nahm, Sahn;Yoon, Seok-Jin
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.193-193
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    • 2011
  • To obtain ceramic films, the sol-gel coating technique has been broadly used with heat treatment, but crack formation tend to occur during heat treatment in thick sol-gel films. We prepared PZT thin films by sol-gel method with single-step spin coating process. The PZT solution have been synthesized using lead acetate ($Pb(CH_3COO)_2$), zirconium acetylacetonate ($Zr(OC_3H_7^n)_4$), and titanium diisopropoxide bis(acetylacetonate) 75wt% in isopropanol ($Ti(OC_3H_7^i)_2(OC_3H_7^n)_2$) as starting materials and n-propanol was selected as a solvent. The poly(vynilpyrrolidone) (PVP) was added with 0, 0.25, 0.5, 0.75, and 1 molar ratios to control viscosity of solution. We investigated influence of the viscosity on thickness, microstructure, and electrical properties of final PZT films. Thermo-gravimetric analysis and differential scanning calorimeter (TGA/DSC) was carried out from room temperature to $800^{\circ}C$ in order to measure pyrolysis temperature. Structural characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ferroelectric and dielectric properties were measured by RT66A (Radiant) and impedance analyzer (Agilent), respectively. The thicknesses of PZT films depended on incorporation of an excess amount of PVP. Finally, we obtained PZT films of good quality without crack formation via single-step spin coating.

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