采用自蒸发法对短长径比和中长径比的金纳米棒进行合理的并排自组装,以提高其作为表面增强拉曼散射(SERS)衬底的潜力

IF 3.3 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR
Khuong Quoc Vo, Thanh-Tuyen Thi Huynh, Thu Anh Nguyen and Tan-Trung Truong
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引用次数: 0

摘要

表面增强拉曼散射(SERS)代表了一种引人注目的检测方法,以电磁场为中心,通常被称为“热点”,在贵金属纳米颗粒周围产生。然而,当使用单个纳米粒子时,电磁场(EMF)放大的效果受到限制。对于不同纵横比的金纳米棒在垂直或平行方向上自组装时电磁场的增加,目前还缺乏实验和理论模拟研究。本研究提出了一种新颖而简便的制造SERS纳米衬底的方法。该方法需要通过自然蒸发自组装具有短和中等宽高比(AR)的金纳米棒(aunr)。通过控制水与乙醇的比例,我们确定了纳米棒相对于硅衬底在垂直和平行方向上合理排列的适当条件。这些纳米衬底已被实验评估其改善表面增强拉曼散射(SERS)性能的能力,为该领域提供了一个新的视角。此外,采用时域有限差分(FDTD)方法对纳米阵列在532 nm、638 nm和785 nm入射光作用下产生的电磁场进行了计算分析。FDTD仿真结果表明,在532 nm激光照射下,宽高比为3.0、纳米间隙为2.0 nm的金纳米棒(aunr)与衬底平行排列时表现出优异的电磁场特性。相反,当aunr垂直于衬底时,它们在与激发的激光相互作用时产生较低的emf。这些发现可能有助于SERS纳米衬底设计的进步。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Rational side-by-side self-assembly of gold nanorods with short and medium aspect ratios via the self-evaporation method to boost their potential as a surface-enhanced Raman scattering (SERS) substrate†

Rational side-by-side self-assembly of gold nanorods with short and medium aspect ratios via the self-evaporation method to boost their potential as a surface-enhanced Raman scattering (SERS) substrate†

Surface-enhanced Raman scattering (SERS) represents a compelling detection methodology centered on the electromagnetic fields, commonly termed “hot spots”, generated around noble nanoparticles. Nonetheless, the efficacy of electromagnetic field (EMF) amplification is constrained when utilizing individual nanoparticles. There has been a notable lack of experimental and theoretically simulated studies regarding the increase of the electromagnetic field when gold nanorods with different aspect ratios undergo self-assembly in either perpendicular or parallel orientations to substrates. This research presents a novel and facile methodology for fabricating SERS nanosubstrates. This method entails self-assembling gold nanorods (AuNRs) with short and medium aspect ratios (ARs) through natural evaporation. By manipulating the water-to-ethanol ratios, we ascertain the appropriate conditions for the rational alignment of the nanorods in both perpendicular and parallel orientations relative to the silicon substrate. These nanosubstrates have been experimentally evaluated for their ability to improve the Surface-Enhanced Raman Scattering (SERS) performance, presenting a novel perspective in this field. In addition, a computational analysis employing the finite-difference time-domain (FDTD) method was conducted to elucidate the electromagnetic field generated by nanoarrays when subjected to incident light of varying wavelengths, including 532 nm, 638 nm, and 785 nm. Notably, the FDTD simulation outcomes indicated that gold nanorods (AuNRs) possessing an aspect ratio of 3.0 and nanogaps of 2.0 nm exhibited exceptional electromagnetic field characteristics when aligned parallel to the substrate under 532 nm laser illumination. Conversely, when the AuNRs were oriented perpendicular to the substrates, they produced lower EMFs upon interaction with excitation laser light. These findings can potentially contribute to the advancement of SERS nanosubstrate design.

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来源期刊
Dalton Transactions
Dalton Transactions 化学-无机化学与核化学
CiteScore
6.60
自引率
7.50%
发文量
1832
审稿时长
1.5 months
期刊介绍: Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.
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