通过重氮盐分子表面修饰金纳米帽子探究其对等离子体共振吸收的影响
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摘要
以玻璃基底作为聚苯乙烯纳米球的载体,首先将聚苯乙烯纳米球旋涂在玻璃基底上,然后通过热沉积的方法将金熔融沉积在聚苯乙烯纳米粒子的表面,再通过超声的方式将负载有金纳米帽子的聚苯乙烯微球从玻璃基底上分离下来,最后用二氯甲烷将聚苯乙烯微球溶解掉,成功制备了空心的金纳米帽子材料。通过共价键链接的方式在这些空心的金纳米帽子的表面成功修饰上苯的衍生物,通过测试分析发现,修饰带有不同电性的基团,金纳米帽子的等离子体共振吸收会发生不同的红移或蓝移现象,推测这是由于金纳米帽子表面结构电子密度的变化所导致。
In this work, gold nanocap-polystyrene particle(PSP) conjugates have been prepared using thermal deposition of gold flux onto PSP particle pre-coated on glass substrate, followed by the lift-up and separation into acetonitrile solvent under sonication. The hollow gold nanocaps were obtained after the PSPs were dissolved with dichloromethane. When the nanocaps were covalently modified with phenyl derivatives in diazonium salt form, the optical absorptions were found as red-or blue-shift, which was probably due to the changing of the electron density of the nanocap surface by the surface-bound electron donating or electron withdrawing functional groups.
In this work, gold nanocap-polystyrene particle(PSP) conjugates have been prepared using thermal deposition of gold flux onto PSP particle pre-coated on glass substrate, followed by the lift-up and separation into acetonitrile solvent under sonication. The hollow gold nanocaps were obtained after the PSPs were dissolved with dichloromethane. When the nanocaps were covalently modified with phenyl derivatives in diazonium salt form, the optical absorptions were found as red-or blue-shift, which was probably due to the changing of the electron density of the nanocap surface by the surface-bound electron donating or electron withdrawing functional groups.
引文
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