Ag@Au双金属纳米颗粒的制备和表征

doi:10.3969/j.issn.1000-5641.2022.01.006

摘要/Abstract

摘要：

采用种子生长法制备了银纳米颗粒, 通过电置换反应将单金属银颗粒转变为中空金银双金属纳米颗粒. 电镜表征及吸收光谱的结果表明, 通过控制种子溶液的加入量、超声时间和离心次数等条件, 能够有效调控金属纳米颗粒的尺寸以及局域表面等离激元的共振峰位与目标分子匹配; 进而可以利用配体交换反应在金属纳米颗粒表面包裹TDBC分子薄膜, 实现表面等离激元-分子激子的强耦合.

关键词: 局域表面等离激元, 金属纳米颗粒, 强耦合

Abstract:

Ag nanoparticles were first prepared using a seed-based thermal synthetic procedure. The monometallic particles were then transformed into bimetallic particles via a galvanic replacement reaction. A transmission electron microscope (TEM), scanning transmission electron microscope (STEM), and absorption spectrum were subsequently used for characterization. By controlling the amount of seed added, the ultrasonic exposure, and the centrifugal time, we can effectively tune the size of the particles and the localized surface plasmon resonance peak positions. The TDBC film can be wrapped on the surface of the metallic nanostructures by a ligand exchange reaction to achieve strong coupling between surface plasmon and molecular excitons.

Key words: localized surface plasmon, metallic nanoparticles, strong coupling

中图分类号:

TB383

赵天琛, 张晓磊, 楼柿涛. Ag@Au双金属纳米颗粒的制备和表征[J]. 华东师范大学学报（自然科学版）, 2022, 2022(1): 43-51.

Tianchen ZHAO, Xiaolei ZHANG, Shitao LOU. Preparation and characterization of Ag@Au bimetallic nanoparticles[J]. Journal of East China Normal University(Natural Science), 2022, 2022(1): 43-51.

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编号(No.)	V(种子溶液)/μL	V(HAuCl₄)/μL	NaBH₄冰水浴	超声时间/min	合成银纳米颗粒后离心次数
Ⅰ	500	130	否	10	1
Ⅱ	260	120	是	90	1
Ⅲ	400	120	是	90	3

元素	重量百分比/%	原子百分比/%
C	8.54	31.78
O	7.85	21.93
Cu	48.72	34.25
Ag	21.98	9.10
Au	12.89	2.92

元素	重量百分比/%	原子百分比/%
C	17.39	53.68
N	1.12	2.98
O	2.59	6.00
Na	2.80	4.52
S	1.08	1.25
Cl	0.54	0.56
Cu	32.67	19.05
Ag	26.11	8.97
Au	15.66	2.94