摘要:通过水溶液还原法在80℃合成Cu纳米线,再利用液相还原法在低温水溶液中将Au负载于其表面,最后通过暴露的Cu纳米线与Pt前驱体盐发生Galvanic置换反应,将Pt负载在Au−Cu纳米线表面,构成Pt−Au−Cu三元核壳结构纳米线.根据对样品形貌、结构的表征和分析,探讨了Pt−Au−Cu纳米线的合成机理.结果表明:合成纳米线物相组成为单质Cu,平均直径约为83 nm;负载Au后的Au−Cu纳米线平均直径约为90 nm,表面附着的小颗粒为单质Au颗粒,构成了核壳结构;负载Pt后得到Pt−Au−Cu三元核壳结构纳米线,平均直径约为120 nm.Cu纳米线表面Au颗粒的形成依赖于异相形核与长大机制,并遵循先层状后岛状生长的混合生长模式.负载Pt过程中存在Pt、Cu互扩散,使得最终纳米线表面多为Pt颗粒而整体则形成CuPt合金相.
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