• Title/Summary/Keyword: UV scanning

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Synthesis of Pressure-sensitive Acrylic Adhesives with Photoreactive Groups and Their Application to Semiconductor Dicing Tapes (광 반응성기를 갖는 아크릴 점착제의 합성과 반도체 다이싱 테이프로의 적용 연구)

  • Hee-Woong Park;Nam-Gyu Jang;Kiok Kwon;Seunghan Shin
    • Applied Chemistry for Engineering
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    • v.34 no.5
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    • pp.522-528
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    • 2023
  • In this work, adhesive tapes were prepared for the dicing process in semiconductor manufacturing. Compounds with different numbers of photoreactive groups (f = 1 to 3) were synthesized and incorporated into acrylic copolymers to formulate UV-curable acrylic adhesives. Structural confirmation of the synthesized photoreactive compounds (f = 2 or 3) was performed using nuclear magnetic resonance (NMR) spectroscopy. The introduction of the photoreactive compounds into the acrylic adhesive was accomplished by urethane reactions, and the successful synthesis of the UV-curable acrylic adhesive was verified by Fourier transform infrared (FT-IR) measurements. To evaluate the performance of the adhesive, the peel strength was evaluated before and after UV irradiation using a silicon wafer as a substrate. The adhesive exhibited high peel strength (~2000 gf/25 mm) before UV exposure, which was significantly reduced (~5 gf/25 mm) after UV exposure. Interestingly, the adhesive containing multifunctional photoreactive compounds showed the most significant reduction in peel strength. In addition, surface residue measurements by field emission scanning electron microscopy (FE-SEM) showed minimal surface residue (~0.2%) after UV exposure. Overall, these results contribute to the understanding of the behavior of UV-curable acrylic adhesives and pave the way for potential applications in semiconductor manufacturing processes.

Improvement in Light Extraction Efficiency of 380 nm UV-LED Using Nano-patterned n-type Gan Substrate (나노 구조의 패턴을 갖는 n-type GaN 기판을 이용한 380 nm UV-LED의 광 추출 효율 개선)

  • Baek, Kwang-Sun;Jo, Min-Sung;Lee, Young-Gon;Sadasivam, Karthikeyan Giri;Song, Young-Ho;Kim, Seung-Hwan;Kim, Jae-Kwan;Jeon, Seong-Ran;Lee, June-Key
    • Korean Journal of Materials Research
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    • v.21 no.5
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    • pp.273-276
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    • 2011
  • Ultraviolet (UV) light emitting diodes (LEDs) were grown on a patterned n-type GaN substrate (PNS) with 200 nm silicon-di-oxide (SiO2) nano pattern diameter to improve the light output efficiency of the diodes. Wet etched self assembled indium tin oxide (ITO) nano clusters serve as a dry etching mask for converting the SiO2 layer grown on the n-GaN template into SiO2 nano patterns by inductively coupled plasma etching. PNS is obtained by n-GaN regrowth on the SiO2 nano patterns and UV-LEDs were fabricated using PNS as a template. Two UV-LEDs, a reference LED without PNS and a 200 nm PNS UV-LEDs were fabricated. Scanning Electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Photoluminescence (PL) and Light output intensity- Input current- Voltage (L-I-V) characteristics were used to evaluate the ITO-$SiO_2$ nanopattern surface morphology, threading dislocation propagation, PNS crystalline property, PNS optical property and UVLED device performance respectively. The light out put intensity was enhanced by 1.6times@100mA for the LED grown on PNS compared to the reference LED with out PNS.

The Influence of Hydrotalcite Intercalated with Benzoate on UV Stability of Acrylic Coating

  • Nguyen, Thuy Duong;Nguyen, Anh Son;Thai, Thu Thuy;Pham, Gia Vu;To, Thi Xuan Hang;Olivier, Marie-Georges
    • Corrosion Science and Technology
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    • v.19 no.1
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    • pp.16-22
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    • 2020
  • It is important to realize that benzoate was intercalated into hydrotalcite (HTC-Bz) by the co-precipitation method. In this case, acrylic coating with 0.5 wt% HTC-Bz was deposited on carbon steel using the spin coating method. Next, the HTC-Bz structure was characterized by Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). In fact, an ultraviolet vision spectroscopy (UV-Vis) was used to determine the benzoate content in HTC-Bz, and the UV absorption ability of HTC-Bz. Using electrochemical techniques, water contact angle measurement, and thermal-gravimetric analysis, we compared the protective properties before and after QUV test, hydrophobicity and the thermal stability of acrylic coating containing HTC-Bz. The obtained results showed that HTC-Bz with a plate-like structure was successfully synthesized; benzoate was intercalated into the interlayer of hydrotalcite with a concentration of 28 wt%. Additionally, it was noted that HTC-Bz has an UV absorption peak at 225 nm. In conclusion, the addition of HTC-Bz enhanced the UV stability, hydrophobicity and the thermal stability of acrylic coating.

New Photochemistry of UV-Absorbing Chemicals in Phase-Controlled Polymer Microspheres (상구조가 조절된 고분자 미립구에서 자외선 흡수제의 거동에 대한 연구)

  • Lee Jong-Suk;Kim Jin-Woong;Kim Junoh;Han Sang-Hoon;Chang Ih-Seop
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.30 no.3 s.47
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    • pp.361-367
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    • 2004
  • In this study, a different UV (ultra-violet) ray absorption system is presented in which butyl methoxydiben-zoylmethane (BMDM, a model UV-A absorbent, 320$\~$400 nm) is stabilized in phase-controlled poly(methyl methacrylate) (PMMA) microspheres. The photochemistry of BMDM in the microspheres was investigated considering its phase characteristics therein. The analysis of a differential scanning calorimeter and X-ray diffractometer showed that the BMDM in the microspheres was present with a non-crystalline state. The phase control of BMDM in the polymer microsphere has an excellent ability to protect UV-A with maintaining its photo- and thermal stability. The results obtained in this study illustrate well that the phase control of the UV absorbents in the polymer microspheres is another key factor that de-termines its photochemistry and photostability in the final formulations.

Preparation of Carbon-$TiO_2$ Composites by Using Different Carbon Sources with Titanium n-Butoxide and Their Photocatalytic Activity (여러 가지 탄소 전구체와 TNB를 이용하여 탄소-$TiO_2$ 복합체를 제조 및 그들의 광촉매 특성)

  • Chen, Ming-Liang;Zhang, Feng-Jun;Zhang, Kan;Meng, Ze-Da;Oh, Won-Chun
    • Elastomers and Composites
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    • v.45 no.1
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    • pp.25-31
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    • 2010
  • We used activated carbon (AC), activated carbon fiber (ACF) and multi-walled carbon nanotube (MWCNT) as carbon sources and titanium n-butoxide as titanium source to prepare carbon-$TiO_2$ composites. For characterization their properties, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) were used. And the photoactivity of the carbon-$TiO_2$ composites, under UV irradiation, was tested using the fixed concentration of methylene blue (MB, $C_{16}H_{18}N_3S{\cdot}Cl{\cdot}3H_2O$) in aqueous solution. After UV irradiation for a certain time, the concentration of MB solution was determined by UV-vis absorption spectroscopy.

The Study of Ag Thin Film of Suitable Anode for T-OLED: Focused on Nanotribology Methode (UV 처리에 의한 T-OLED용 산화전극에 적합한 Ag 박막연구: Nano-Mechanics 특성 분석을 중심으로)

  • Lee, Kyu Young;Kim, Soo In;Kim, Joo Young;Kwon, Ku Eun;Kang, Yong Wook;Son, Ji Won;Jeon, Jin Woong;Kim, Min Chul;Lee, Chang Woo
    • Journal of the Korean Vacuum Society
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    • v.21 no.6
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    • pp.328-332
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    • 2012
  • The work function of Ag (silver) is too low (~4.3 eV) to be used as an electrode of T-OLED (Top Emission Organic Light Emitting Diode). To solve this weakness, researches used plasma-, UV-, or thermal treatment on Ag films in order to increase the work function (~5.0 eV). So, most of studies have focused only on the work function of various treated Ag films, but studies focusing on nanomechanical properties were very important to investigate the efficiency and life time of T-OLED etc. In this paper, we focused on the mechanical properties of the Ag and $AgO_x$ film. The Ag was deposited on a glass substrate with the thickness of 150 nm by using rf-magnetron sputter with the power was fixed at 100 W and working pressure was 3 mTorr. The deposited Ag film was UV treated by UV lamp for several minutes (0~9 min). We measured the sheet resistance and mechanical property of the deposited film. From the experimental result, there were some differences of the sheet resistance and surface hardness of Ag thin film between short time (0~3 min) and long time UV treatment. These result presumed that the induced stress was taken place by the surface oxidation after UV treatment.

Application of Photocatalytic Decomposition of Methylene Blue on N-doped TiO2 (질소 도핑 TiO2의 Methylene Blue 광분해 제거에의 적용)

  • Baek, Mi-Hwa;Choi, Su-A;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
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    • v.26 no.4
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    • pp.707-712
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    • 2010
  • Nitrogen-doped $TiO_2$ particles have been successfully prepared using titanium tetraisopropoxide as the Ti source and urea as the nitrogen source. As-prepared nitrogen-doped $TiO_2$ was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller method (BET) and ultraviolet-visible light (UV-vis) absorption spectra techniques. Photocatalytic degradation of Methylene Blue (MB) has been carried out in both solar light (UV-vis) and the visible region (${\lambda}=420nm$). Nitrogen-doped $TiO_2$ exhibits higher activity than the commercial $TiO_2$ photocalyst, particularly under visible-light irradiation because bandgap of nitrogen-doped $TiO_2$ becomes remarkably decreased.

Biosynthesis of Silver Nanoparticles by Phytopathogen Xanthomonas oryzae pv. oryzae Strain BXO8

  • Narayanan, Kannan Badri;Sakthivel, Natarajan
    • Journal of Microbiology and Biotechnology
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    • v.23 no.9
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    • pp.1287-1292
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    • 2013
  • Extracellular biogenic synthesis of silver nanoparticles with various shapes using the rice bacterial blight bacterium Xanthomonas oryzae pv. oryzae BXO8 is reported. The synthesized silver nanoparticles were characterized by UV-Vis spectroscopy, powder X-ray diffractometry (XRD), scanning electron microscopy, energy dispersive X-ray spectrometry, and high-resolution transmission electron microscopy (HR-TEM). Based on the evidence of HR-TEM, the synthesized particles were found to be spherical, with anisotropic structures such as triangles and rods, with an average size of 14.86 nm. The crystalline nature of silver nanoparticles was evident from the bright circular spots in the SAED pattern, clear lattice fringes in the high-resolution TEM images, and peaks in the XRD pattern. The FTIR spectrum showed that biomolecules containing amide and carboxylate groups are involved in the reduction and stabilization of the silver nanoparticles. Using such a biological method for the synthesis of silver nanoparticles is a simple, viable, cost-effective, and environmentally friendly process, which can be used in antimicrobial therapy.

High resolution patterning of polyfluorene derivative containing photo cross-linkable oxetane units

  • Park, Moo-Jin;Lee, Jeong-Ik;Chu, Hye-Yong;Kim, Seong-Hyun;Zyung, Taeh-Young;Hwang, Do-Hoon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1419-1420
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    • 2005
  • We have synthesized a photo patternable blue lightemitting polyfluorene (PF) derivative containing cross-linkable oxetane units. Poly(9,9-bis-(4-octyloxyphenyl)- fluorene-2,7-diyl-alt-9,9-bis-((3-hexyloxy-3'- ethyl)-oxetane)-fluorene-2,7-diyl) has been synthesized by Suzuki coupling polymerization. The relationship between patterning property and several variables such as the intensity of the exposed UV light, the concentrations of additives, has been studied by using optical microscope UV/visible spectroscopy, photoluminescence and scanning electron microscope (SEM). We obtained fine patterns with 10 mm resolution using the polymer film after exposure and development. This patterning method using conjugated polymers can be applicable to make fine pixels for PLEDs and OFETs.

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The Behavior of Low Molecular Weight Silicone Fluids in Silicone Rubber (자외선 조사에 따른 실리콘 교무에 존재하는 가동성 저분자량 성분의 거동)

  • Hong, Joo-Il;Lee, Ki-Taek;Seo, Yu-Jin;Hwang, Sun-Mook;Huh, Chang-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.11a
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    • pp.312-315
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    • 2004
  • In this paper we investigated the behavior of low molecular weight silicone fluids in silicone rubber by W treatment with solvent-extraction and GPC. It was shown that LMW quantity which was extracted by solvent-extraction was decreased in UV treatment time. $200{\sim}450\;g/mol$ distribution of LMW silicone fluid was contributed to recovery. It was similar to result from corona discharge. Morphological analysis was investigated by scanning electron microscope(SEM) and X-ray diffraction (XRD). The behavior of LMW silicone fluids in silicone rubber which was contributed to recovery was discussed.

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