Controlled etching and tapering of Au nanorods using cysteamine

Nanoscale
Brian SzychowskiMarie-Christine Daniel

Abstract

While gold nanorods (AuNRs) have found many applications due to their unique optical properties, a few challenges persist in their synthesis. Namely, it is often difficult to reproducibly synthesize AuNRs with specific and monodisperse sizes, especially at shorter aspect ratios. Here, we report a method of post-synthesis precise tailoring of AuNRs by etching with cysteamine. Cysteamine selectively etches AuNRs from their ends while preserving the initial rod shape and monodispersity, making this a viable means of obtaining highly monodisperse short AuNRs down to aspect ratio 2.3. Further, we explore the effect of this etching method on two types of silica-coated AuNRs: silica side-coated and silica end-coated AuNRs. We find that the etching process is cysteamine concentration-dependent and can lead to different degrees of sharpening of the silica-coated AuNRs, forming elongated tips. We also find that cysteamine behaves only as a ligand at concentrations above 200 mM, as no etching of the AuNRs is observed in this condition. Simulations show that excitation of plasmon resonances in these sharpened AuNRs produces local electric fields twice as strong as those produced by conventional AuNRs. Thus, cysteamine etching of AuNRs is s...Continue Reading

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Citations

May 11, 2021·Frontiers in Pharmacology·Shengnan LiaoJinfeng Liao
Jun 19, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Nan WangMeng Lin
Nov 12, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Maggie WangYing Bao
Sep 3, 2021·Biosensors & Bioelectronics·Mamata KarmacharyaYoon-Kyoung Cho
Sep 28, 2021·Chemical Reviews·Jiapeng ZhengJianfang Wang
Dec 2, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tao WangJingzhe Li

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Methods Mentioned

BETA
surface plasmon resonance
transmission electron microscopy

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