合成后加热,这是调整被CTAB覆盖或嵌入硅壳的金纳米棒的LPR带的关键步骤

IF 2.2 4区 工程技术 Q2 Chemistry
Angela Candreva, Francesco Parisi, Giuseppe Di Maio, Francesca Scarpelli, Iolinda Aiello, Nicolas Godbert, Massimo La Deda
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引用次数: 3

摘要

纳米技术从实验室到工业规模制造的转变对纳米颗粒的实现提出了各种挑战。从这个角度来看,除了传统的合成方法外,基于种子介导生长的方法,研究了一种重塑热策略来改善对金纳米棒长径比的控制,旨在指出一种潜在的和令人兴奋的方法来更好地管理纳米颗粒的可扩展性和可重复性。为此,已经合成了覆盖CTAB的纳米棒和包裹在厚度可调的硅壳内的纳米棒,并在不同温度下进行后热处理,CTAB回收的金纳米棒最高可达300°C (AuNR@CTAB),硅壳嵌入的金纳米棒最高可达500°C (AuNR@SiO2)。对于AuNR@CTAB,通过精确的温度控制,纵向等离子体能带可以在稍微减少其长度的情况下非常接近横向等离子体能带。相反,对于AuNR@SiO2,由于完全无机的外壳,可以达到更高的处理温度,从而有可能将纳米棒重塑成球体,而不会观察到任何副产物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Post-synthesis heating, a key step to tune the LPR band of gold nanorods covered with CTAB or embedded in a silica shell

Post-synthesis heating, a key step to tune the LPR band of gold nanorods covered with CTAB or embedded in a silica shell

The transitioning of nanotechnology from laboratory to industrial-scale manufacturing poses various challenges in nanoparticle realization. From this perspective, beside the conventional synthetic procedure, based on the seed-mediated growth approach, a reshaping thermal strategy has been investigated to improve the control on gold nanorods aspect ratio, with the aim to point out a potential and encouraging way to better manage the scalability and reproducibility of nanoparticles. For this purpose, nanorods covered with CTAB and nanorods enclosed within a silica shell of tuned thickness have been synthesized and submitted to a post-thermal treatment at various temperatures, up to 300 °C for CTAB recovered gold nanorods (AuNR@CTAB), and up to 500 °C for silica-shell embedded gold nanorods (AuNR@SiO2). For AuNR@CTAB, through accurate temperature control, the longitudinal plasmonic band can be moved very close to the transversal one upon slight reduction of their length. Instead, for AuNR@SiO2, owing to the fully inorganic shell, a higher temperature of treatment can be reached leading to the possibility of reshaping the nanorods into spheres without the observation of any by-products.

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来源期刊
Gold Bulletin
Gold Bulletin 工程技术-材料科学:综合
CiteScore
3.30
自引率
4.50%
发文量
0
审稿时长
3 months
期刊介绍: Gold Bulletin is the premier international peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, state-of-the-art reviews, conference reports, book reviews and highlights of patents and scientific literature. Gold Bulletin does not publish manuscripts covering the snthesis of Gold nanoparticles in the presence of plant extracts or other nature-derived extracts. Gold Bulletin has been published over 40 years as a multidisciplinary journal read by chemists, physicists, engineers, metallurgists, materials scientists, biotechnologists, surface scientists, and nanotechnologists amongst others, both within industry and academia. Gold Bulletin is published in Association with the World Gold Council.
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