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자외선 조사가 수계 용매에서 합성된 셀렌화 아연 양자점의 광학특성에 미치는 영향
백금지,강유진,강이주,임정현,홍현선 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.2
ZnSe quantum-dots were synthesized in an aqueous system and UV irradiation was introduced as a post-treatment process. The synthesis temperature was varied from 25 oC to 90 oC, and the surface of the nano powder was stabilized using different ligands such as glutathione (GSH), 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA). Then, the effect of UV irradiation on the structure and the absorption/ emission properties of the nano powder were investigated. As the UV light was irradiated, the PL intensity of the quantum dots increased. UV irradiation for 16 h increased the PL intensity of the synthesized quantum dots at room temperature to the level of those at 90 oC. Particle aggregation was not found with UV irradiation of at least 24 h. XRD patterns confirmed that the UV irradiation released sulfur from the GSH, inducing the formation of the ZnSe/ZnS composite-typed nano powders. The luminescence characteristics of the GSH or TGA-added quantum dots were enhanced by UV irradiation regardless of temperature, while MPA-added quantum dots were not significantly affected by UV irradiation. The post-treatment process with UV irradiation showed the possibility that even ZnSe quantum dots, which are synthesized at low temperature and have low luminescence intensity, can have luminescence characteristics comparable to those of hightemperature synthesis.
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내부 도핑 법에 의한 Cu 도핑 Cu:ZnSe 양자점의 수계 합성 및 발광 특성
백금지,홍현선 한국분말재료학회 2022 한국분말재료학회지 (KPMI) Vol.29 No.5
Cu-doped ZnSe quantum dots were successfully synthesized in an aqueous solution using an internal doping method. The effects of ligand type, CuSe synthesis temperature, and heating time on Cu-doped ZnSe synthesis were systematically investigated. Of MPA, GSH, TGA, and NAC used as ligands, MPA was the optimal ligand as determined by PL spectrum analysis. In addition, the emission wavelength was found to depend on the synthesis temperature of the internal doping core of CuSe. As the temperature increased, the doping of Cu2+ was enhanced, and the emission wavelength band was redshifted; accordingly, the emission peaks moved from blue to green (up to 550 nm). Thus, the synthesis of Cu:ZnSe using internal doping in aqueous solutions is a potential method for ecomanufacturing of colortuned ZnSe quantum dots for display applications.
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ZnSe 나노분말 합성에 미치는 환원제와 첨가제의 영향
백금지,이다경,이민서,송하연,홍현선,Back, Geum Ji,Lee, Da Gyeong,Lee, Min Seo,Song, Ha Yeon,Hong, Hyun Seon 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.3
Nano-sized ZnSe particles are successfully synthesized in an aqueous solution at room temperature using sodium borohydride (NaBH<sub>4</sub>) and thioglycolic acid (TGA) as the reducing agent and stabilizer, respectively. The effects of the mass ratio of the reducing agent to Se, stabilizer concentration, and stirring time on the synthesis of the ZnSe nanoparticles are evaluated. The light absorption/emission properties of the synthesized nanoparticles are characterized using ultraviolet-visible (UV-vis) spectroscopy, photoluminescence (PL) spectroscopy, and particle size analyzer (PSA) techniques. At least one mass ratio (NaBH4/Se) of the reducing agent should be added to produce ZnSe nanoparticles finer than 10 nm and to absorb UV-vis light shorter than the ZnSe bulk absorption wavelength of 460 nm. As the ratio of the reducing agent increases, the absorption wavelengths in the UV-vis curves are blue-shifted. Stirring in the atmosphere acts as a deterrent to the reduction reaction and formation of nanoparticles, but if not stirred in the atmosphere, the result is on par with synthesis in a nitrogen atmosphere. The stabilizer, TGA, has an impact on the Zn precursor synthesis. The fabricated nanoparticles exhibit excellent photo-absorption/discharge characteristics, suggesting that ZnSe nanoparticles can be alloyed without the need for organic solutions or high-temperature environments.
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글루타티온이 캡핑된 ZnSe 나노 입자 발광 특성에 미치는 합성 조건의 영향
백금지,송하연,이민서,홍현선 한국분말야금학회 2021 한국분말재료학회지 (KPMI) Vol.28 No.1
Zinc selenide (ZnSe) nanoparticles were synthesized in aqueous solution using glutathione (GSH) as a ligand. The influence of the ligand content, reaction temperature, and hydroxyl ion concentration (pH) on the fabrication of the ZnSe particles was investigated. The optical properties of the synthesized ZnSe particles were characterized using various analytical techniques. The nanoparticles absorbed UV-vis light in the range of 350-400 nm, which is shorter than the absorption wavelength of bulk ZnSe particles (460 nm). The lowest ligand concentration for achieving good light absorption and emission properties was 0.6 mmol. The reaction temperature had an impact on the emission properties; photoluminescence spectroscopic analysis showed that the photo-discharge characteristics were greatly enhanced at high temperatures. These discharge characteristics were also affected by the hydroxyl ion concentration in solution; at pH 13, sound emission characteristics were observed, even at a low temperature of 25oC. The manufactured nanoparticles showed excellent light absorption and emission properties, suggesting the possibility of fabricating ZnSe QDs in aqueous solutions at low temperatures.
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김미소 ( Miso Kim ),백금지 ( Geumji Back ),변은경 ( Eun Kyung Byun ),이유림 ( You Lim Lee ),최예지 ( Yeji Choi ),장정원 ( Jungwon Chang ),홍현선 ( Hyun Seon Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2019 No.-
ITO (Indium Tin Oxide) transparent electrode of after used LCD, contains indium oxides, which is classified as an expensive rare metal. Therefore, LCD recycling is becoming an important issue in terms of solving environmental problems and securing resources. Followed by dismantling of waste LCD, for hydrometallurgical indium recovery from LCD through solvent extraction is the rudimentary stage. The determination of optimum conditions is rather essential from efficient solvent extraction process development perspective. Hence, solvent extraction efficiency of indium as function of leachant(A)/extractant(O) ratio, extractant(O)/stripping reagent(A') ratio and reaction temperature were investigated. Through our investigation, A/O and O/A' ratio varies from 1 to 8, reaction temperature varies from 25℃(RT) to 80℃. As extractant and stripping reagent, D2EHPA and HCl were used, respectively.
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