Preparation and characterization of Ag@Au bimetallic nanoparticles

doi:10.3969/j.issn.1000-5641.2022.01.006

Abstract

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

CLC Number:

TB383

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.

Figures/Tables 8

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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