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  • 09월 04일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Pulsed laser ablation synthesis of hcp and fcc Ni nanoparticles in liquids

2014년 8월 28일 16시 36분 21초
PHYS.P-457 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
정현진, 최명룡*
경상대학교 화학과, Korea
We report a simple and controllable preparation of face centered cubic (fcc) and hexagonal close-packed (hcp) Ni nanoparticles by a pulsed Nd-YAG laser ablation method in various solvents, such as deionized water, methanol, hexane, and acetonitrile. We generate Ni/NiO and fcc/hcp Ni nanoparticles by a laser ablation to a Ni plate submerged in various solvents, followed by a post-ablation to the colloidal solutions. Interestingly, the phases of Ni nanoparticles prepared via PLAL show a strong dependence on the solvents used in the ablation process. Ni/NiO, pure fcc, and mixture of fcc and hcp Ni nanoparticles were generated in DI water, methanol, and hexane or acetonitrile, respectively. After the post-ablation, however, pure fcc Ni nanoparticles were generated in methanol and hexane; while pure hcp Ni was formed in acetonitrile. We think that the solvent dependence on the phase of Ni nanocrystals is related to the specific heat of solvents that plays an important role kinetically and thermodynamically in the process of cooling the plasma plume where the nanoparticles nucleate and coalesce to a specific phase. Formation of graphite layers on Ni nanoparticles fabricated in hexane and acetonitrile is also discussed. The Ni nanoparticles prepared from PLAL were analyzed by X-ray diffraction (XRD) measurements, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), and fast Fourier transform (FFT) analysis.