In Situ Time-Resolved XAFS Study on the Formation Mechanism of Cu Nanoparticles Using Poly (N-vinyl-2-pyrrolidone) as a Capping Agent
In Situ Time-Resolved XAFS Study on the Formation Mechanism of Cu Nanoparticles Using Poly (N-vinyl-2-pyrrolidone) as a Capping Agent
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DOI：
10.1021/la904248z
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发表时间：
2010-03-16
期刊：
影响因子：
3.9
通讯作者：
Ebitani, Kohki
中科院分区：
文献类型：
--
作者：
Nishimura, Shun;Takagaki, Atsushi;Ebitani, Kohki
采用X射线衍射（XRD）、透射电镜（TEM）、原位时间分辨X射线吸收精细结构（XAFS）分析、原位紫外可见光谱（UV-vis）和全指示剂法研究了以聚乙烯吡咯烷酮（PVP）为封端剂的铜纳米粒子（Cu）的形成机理。XAFS分析，结合TEM观察和指示剂法，揭示了稳定的中间体如Cu（OH）（2）和Cu+-PVP中间体在Cu NP成核的诱导期形成，它们在Cu NP的形成中起关键作用。我们的研究结果表明，PVP封端剂是重要的，不仅要保护NP从过度生长和聚集，但也控制NP形成的反应动力学。
The formation mechanism of copper nanoparticles (NPS) using poly(N-vinyl-2-pyrrolidone) (PVP) as a capping agent was investigated by measurements of X-ray diffraction (XRD), transmission electron microscopy (TEM), in situ time-resolved X-ray adsorption fine structure (XAFS) analysis, in situ UV-vis spectroscopy, and all indicator method. XAFS analyses, in combination with TEM observations and the indicator method, revealed that the stable intermediates such as Cu(OH)(2) and Cu+-PVP intermediate were formed during an induction period of nucleation of Cu NPs, which play a critical role in the Cu NP formation. Our results suggest that the PVP capping agent is important not only to protect NPs from overgrowth and aggregation but also to control the reaction kinetics of NP formation.