Spectroscopic analyses of particle and energy aggregations at the interface of silver nanoparticles and fluorescent carbon nanodots

We study the change in the surface electromagnetic field provided by photoexcited silver nanoparticles as the field is disturbed by fluorescent carbon nanodots. Fluorescent carbon nanodots with an appropriate quantity and quality of surface functional groups are used to mediate the aggregation of si...

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Published inNanoscale Vol. 15; no. 34; pp. 13987 - 13996
Main Authors Hung, Yi-Shan, Chang, Chia-Wen, Shen, Yi Chen, Yu, Yun-Chi, Huang, Wei-Lun, Huang, Chia-Chi
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 01.09.2023
Subjects
Conical bodies
Electromagnetic fields
Fluorescence
Functional groups
Molecular spectroscopy
Nanoparticles
Silver
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Summary:We study the change in the surface electromagnetic field provided by photoexcited silver nanoparticles as the field is disturbed by fluorescent carbon nanodots. Fluorescent carbon nanodots with an appropriate quantity and quality of surface functional groups are used to mediate the aggregation of silver nanoparticles of matching size and shape to form available nano-size conical structures. Carbon nanodots in the composite absorb and transfer additional photoenergy to the silver surface, resulting in energy aggregation within the cone structure and enhancement of the electromagnetic field in proximity to the silver surface. This elevated energy state is manifested in the strengthening of the SERS signal of the analytical probe 4-aminophenyl disulfide and the mechanism involved is elucidated by additional molecular spectroscopy studies. The deconvolution of a SERS hotspot: synergistic aggregation of silver nanoparticles and modified carbon nanodots on the surface of an alumina bead.
Bibliography:https://doi.org/10.1039/d3nr01695a
Electronic supplementary information (ESI) available. See DOI
ObjectType-Article-1
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ISSN:2040-3364
2040-3372
DOI:10.1039/d3nr01695a