Abstract
The irradiation of gold nanorod colloids with a femtosecond laser can be tuned to induce controlled nanorod reshaping, yielding colloids with exceptionally narrow localized surface plasmon resonance bands. The process relies on a regime characterized by a gentle multishot reduction of the aspect ratio, whereas the rod shape and volume are barely affected. Successful reshaping can only occur within a narrow window of the heat dissipation rate: Low cooling rates lead to drastic morphological changes, and fast cooling has nearly no effect. Hence, a delicate balance must be achieved between irradiation fluence and surface density of the surfactant on the nanorods. This perfection process is appealing because it provides a simple, fast, reproducible, and scalable route toward gold nanorods with an optical response of exceptional quality, near the theoretical limit.
Highlights
A certain degree of size and shape polydispersity is accepted as a general outcome in the synthesis of colloidal nanoparticles, but this polydispersity can diminish the functional properties of the nanoparticles relative to those of an ideal, singlesize ensemble [1]
Efforts to improve the synthesis of gold nanorods have focused on optimizing the uniformity in the aspect ratio (r, defined as the length-to-width ratio), with the aim of achieving the narrowest
In 2000, El-Sayed and co-workers proposed the use of femtosecondpulsed laser excitation to modify the morphology of presynthesized colloidal gold nanorods [27], but most of the progress in control over the reshaping process has been related to the influence of nanoparticle surface chemistry [24,25,26]
Summary
A certain degree of size and shape polydispersity is accepted as a general outcome in the synthesis of colloidal nanoparticles, but this polydispersity can diminish the functional properties of the nanoparticles relative to those of an ideal, singlesize ensemble [1]. No attempt has been made to use ultrafast pulses to reduce the polydispersity in the aspect ratio of nanorod colloids.
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