Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties

Abstract

The influence of nanocrystallinity on the electronic and mechanical properties of metal nanoparticles is still poorly understood, due to the difficulty in synthesizing nanoparticles with a controlled internal structure. Here, we report on a new method for the selective synthesis of Au nanoparticles in either a singledomain or a polycrystalline phase maintaining the same chemical environment. We obtain quasi-spherical nanoparticles whose diameter is tunable from 6 to 13 nm with a resolution down to ≈0.5 nm and narrow size distribution (4-5%). The availability of such high-quality samples allows the study of the impact of the particle size and nanocrystallinity on a number of parameters, such as plasmon dephasing time, electronphonon coupling, period and damping time of the radial breathing modes.

Tunable SERS Platforms from Small Nanoparticle 3D Superlattices: A Comparison between Gold, Silver, and Copper

“…Their final size was controlled by the reaction temperature and the amount of ligands. Gold NPs of larger size (11 nm) were obtained by using the 5.3 nm diameter gold NPs as seeds . Seed growth was induced in a solution of Au–oleylamine complex at 90 °C for 6 h. The final sizes of the NPs were controlled by adjusting the gold complex concentration.…”

“…Gold NPs of larger size (11nm) were obtained by using the 5.3 nm diameter gold NPs as seeds. [42] Seed growth was induced in as olution of Au-oleylamine complex at 90 8Cf or 6h.T he final sizes of the NPs were controlled by adjusting the gold complex concentration. At the end of the growth process, gold NPs were also coated with oleylamine by substitution of the initial dodecanethiol ligands, as confirmed by using X-ray photoelectron spectroscopy ( Figure S2).…”

Simple preparation of Pd-NP/polythiophene nanospheres for heterogeneous catalysis

“…General preparation methods of metallic NPs often require a reducing agent (such as sodium citrate, ascorbic acid, NaBH 4 , or hydrazine hydrate) for the metallic precursors and suitable surface capping ligands to control the dimension and shape [12][13][14][15][16].…”

Size-controlled and water-soluble gold nanoparticles using UV-induced ligand exchange and phase transfer

“…Seeded growth reactions rely on the slow reduction and deposition of a gold precursor on a seed, resulting in controlled growth of the seeds. 31 Transmission electron microscopy (TEM) images showed that the AuNPs form large, hexagonally ordered crystals when deposited on a TEM grid, indicating their narrow size distributions. 31 This infers that the narrow size distribution of the seeds is retained throughout the seeded growth approach (Fig.…”