• 제목/요약/키워드: Low-temperature synthesis

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Comparison of Optical Properties of Ga-doped and Ag-doped ZnO Nanowire Measured at Low Temperature

  • Lee, Sang Yeol
    • Transactions on Electrical and Electronic Materials
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    • 제15권5호
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    • pp.262-264
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    • 2014

  • Pristine ZnO, 3 wt.% Ga-doped (3GZO) and 3 wt.% Ag-doped (3SZO) ZnO nanowires (NWs) were grown using the hot-walled pulse laser deposition (HW-PLD) technique. The doping of Ga and Ag in ZnO NWs was observed by analyzing the optical and chemical properties. We optimized the synthesis conditions, including processing temperature, time, gas flow, and distance between target and substrate for the growth of pristine and doped ZnO NWs. The diameter and length of pristine and doped ZnO NWs were controlled under 200 nm and several ${\mu}m$, respectively. Low temperature photoluminescence (PL) was performed to observe the optical property of doped NWs. We clearly observed the shift of the near band edge (NBE) emission by using low temperature PL. In the case of 3GZO and 3SZO NWs, the center photon energy of the NBE emissions shifted to low energy direction using the Burstein Moss effect. A strong donor-bound exciton peak was found in 3 GZO NWs, while an acceptor-bound exciton peak was found in 3SZO NWs. X-ray photoelectron spectroscopy (XPS) also indicated that the shift of binding energy was mainly attributed to the interaction between the metal ion and ZnO NWs.

  • https://doi.org/10.4313/TEEM.2014.15.5.262 인용 PDF KSCI

저온 공정용 지르코니아-알루미나 복합 코팅제 연구 (Zirconia-Alumina Composite Coating Materials for Low Temperature Process)

  • 최종완
    • 한국응용과학기술학회지
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    • 제38권6호
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    • pp.1561-1567
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    • 2021

  • 지르코니아 복합체는 지르코니아 전구체, 알루미나 전구체, 그리고 유기 실란의 혼합물을 플라스틱 기판 위에 코팅하여 졸 겔 공정과 저온의 광경화 과정, 그리고 열처리 공정 등 세 단계를 거쳐 합성하였고, FT-IR과 XPS 분석을 통하여 지르코니아 전구체와 알루미나 전구체의 비율에 따라 합성된 복합체내 Zr 원소와 Al 원소 비율이 일치함을 확인하였다. 코팅된 복합체는 파장이 420 nm 이상인 가시광선 영역에서 96 % 이상의 투과도를 보였고, 기계적 강도는 연필 강도 9H 이상을 나타내었다. 특히 지르코니아와 알루미나의 몰 비가 1:4의 비율의 복합 코팅제의 나노 압입 경도가 1.212 GPa로 가장 높은 것으로 확인되었다.

  • https://doi.org/10.12925/jkocs.2021.38.6.1561 인용 PDF KSCI