Abstract
This article presents the influence of capping ligand and surface interaction types on the coarsening or reshaping behavior of surface-immobilized gold nanoparticles with different core size and shape. The morphological transformation of gold nanoparticles and nanorods on graphene oxide upon heating at temperatures ranging from 50 to 200 °C was investigated. The aggregation and coarsening behaviors of spherical nanoparticles on graphene oxide were slightly affected by the core size of nanoparticles (~ 1, 3, and 10 nm). The comparison of two different surface ligands revealed that glutathione ligands provide much better protection than cetyltrimethylammonium bromide ligands against the morphological transformation of nanoparticles. In addition, the evaluation of surface binding interactions indicated that the attachment of nanoparticles and nanorods onto graphene oxide with additional thiol functional groups could improve the immobilization of particles and therefore decelerate coarsening and reshaping of nanoparticle and nanorods.
Highlights
Metal nanoparticles are a class of functional materials with unique physical and chemical properties, which are closely related to their size, shape, composition, and structure [1, 2]
UV–vis spectra of glutathione-capped gold nanopar‐ ticles (gAuNP) with different core sizes are shown in Fig. 1a, which confirmed the optical properties of gold nanoparticles corresponding to their expected sizes
4 Conclusions In this study, the coarsening behavior of gold nanoparticles on graphene oxide was investigated with the focus on the influence of particle core size, stabilizing ligands, and thiol linkers
Summary
Metal nanoparticles are a class of functional materials with unique physical and chemical properties, which are closely related to their size, shape, composition, and structure [1, 2]. TEM results shown in Additional file 1: Figure S2 indicated that cAuNP3nm and cAuNR are immobilized on GO without any aggregation or reshaping maintaining a similar core size and an aspect ratio of over 3 (~ 54 nm in length and ~ 17 nm in width), respectively.
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