Well‐Controlled Synthesis of Au@Pt Nanostructures by Gold‐Nanorod‐Seeded Growth

Abstract

Pt nanodots were formed on Au nanorods (NRs) by using a simple seed-mediated growth. Their density and distribution on the Au NR can be finely tuned by varying the reaction parameters. At lower Pt/Au ratios, the Pt nanodots mainly appear at endcaps and side edges of the Au rod. At higher Pt/Au ratios, they distribute homogeneously over the whole Au rod. The obtained Pt nanostructure is a single crystal owing to the epitaxial growth of Pt on the Au rod. Due to the unique surface plasmon resonance (SPR) features of the Au NRs, the Au core/Pt shell (Au@Pt) nanostructures also exhibit well-defined and red-shifted longitudinal SPR bands in the visible and near-infrared region. The position and intensity can be regulated by the thickness and amount of the Pt shell. At a thinner Pt thickness, the Au@Pt NRs show higher dielectric sensitivity than the corresponding Au NRs. It thus opens up the potential of Pt nanostructures for SPR-based sensing.

Trafficking of Gold Nanorods in Breast Cancer Cells: Uptake, Lysosome Maturation, and Elimination

“…The synthesis of PDDAC-coated AuNRs was described in our previous work. 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Statistic Analysis. Quantitative data are expressed as mean ± SD.…”

Surface chemistry and aspect ratio mediated cellular uptake of Au nanorods

“…CTAB-coated Au NRs with different aspect ratio (AR) were synthesized by the seed-mediated growth [12,17,31,32]. Firstly, CTAB-capped Au seeds were obtained by chemical reduction of HAuCl 4 with NaBH 4 : 7.5 ml 0.1 M CTAB was mixed with 100 mL 24 mM HAuCl 4 and diluted with water to 9.4 ml.…”

Anisotropic Gold Nanoparticles: Preparation, Properties, and Applications

“…They have advantages of simple procedure, high yield, scale-up quantity, feasible size/shape control, and flexible for further structural modifications [33]. Similarly, AuNRs themselves can be used as seeds in the synthesis of more complex structures, for instance, Pt nanodots can form on AuNR surface which possesses more complex properties [34]. Based on this method, now commercially available AuNRs have appeared in market.…”