변형 폴리올 공정에서 Sn 나노입자의 합성 특성에 미치는 용매의 종류 및 점도의 영향 (Effect of Solvent Type and Viscosity on Modified Polyol Synthesis of Sn Nanoparticles)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 53권 / 4호 / 253 ~ 261페이지
· 저자명 : 지상수, 김지환, 이종현

초록

We report on the effect of solvent type on the synthesis of Sn nanoparticles via a modified polyol method at room temperature in an ambient atmosphere. In the synthesis, tin (II) 2-ethylhexanoate, sodium borohydride (NaBH4), and polyvinylpyrrolidone (PVP) were used as a precursor, reducing agent, and capping molecule, respectively. Transmission electron microscopy confirmed by that the Sn nanoparticles obtained in 1,5-pentanediol were smaller (9.2 nm) than 10 nm for an average diameter and had a narrow size distribution. We also observed that the average diameter of Sn nanoparticles obtained in 1,5-pentanediol increased slightly with a decreasing PVP molecular weight. The result can explain the synthesis mechanism in which Sn ions are not only preferential in forming a complex with the PVP but also preferentially reduced in a solvent, and the movement of reduced particles is influenced by the PVP. Consequently, an increase in PVP molecular weight may more effectively inhibit coalescence between nanoparticles, which are surrounded by a longer molecular chain and are highly viscous in the synthesis solution, all of which finally results in a decrease in the average particle size. On the basis of Fourier-transform infrared spectroscopy result, we demonstrated that the PVP on the Sn surface could be removed using an acetone/methanol mixed solvent.

영어초록

We report on the effect of solvent type on the synthesis of Sn nanoparticles via a modified polyol method at room temperature in an ambient atmosphere. In the synthesis, tin (II) 2-ethylhexanoate, sodium borohydride (NaBH4), and polyvinylpyrrolidone (PVP) were used as a precursor, reducing agent, and capping molecule, respectively. Transmission electron microscopy confirmed by that the Sn nanoparticles obtained in 1,5-pentanediol were smaller (9.2 nm) than 10 nm for an average diameter and had a narrow size distribution. We also observed that the average diameter of Sn nanoparticles obtained in 1,5-pentanediol increased slightly with a decreasing PVP molecular weight. The result can explain the synthesis mechanism in which Sn ions are not only preferential in forming a complex with the PVP but also preferentially reduced in a solvent, and the movement of reduced particles is influenced by the PVP. Consequently, an increase in PVP molecular weight may more effectively inhibit coalescence between nanoparticles, which are surrounded by a longer molecular chain and are highly viscous in the synthesis solution, all of which finally results in a decrease in the average particle size. On the basis of Fourier-transform infrared spectroscopy result, we demonstrated that the PVP on the Sn surface could be removed using an acetone/methanol mixed solvent.

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