Unraveling the Dominant Size Effect in Polydisperse Solutions and Maximal Electric Field Enhancement of Gold Nanoparticles

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Quang Truong Pham, Gia Long Ngo, Chi Thanh Nguyen, Isabelle Ledoux-Rak, N. D. Lai
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Abstract

In this study, we systematically investigate theoretically and experimentally the plasmonic effect and roles of big and small gold nanoparticles (Au NPs) within a mixed solution. The polydisperse solution was initially prepared by mixing small (10, 30 nm) Au NPs with larger ones (50, 80 nm), followed by measuring the extinction using ultraviolet–visible (UV-vis) spectroscopy. The experimental results clearly showed that the extinction of the mixed solution is predominantly influenced by the presence of the larger NPs, even though their quantity is small. Subsequently, we conducted simulations to explore the plasmonic properties of Au NPs of different sizes as well as their mixings and to validate the experimental results. To explain the deviation of the extinction spectra between experimental observations and simulations, we elaborated a simulation model involving the mixture of spherical Au NPs with ellipsoidal NPs, thus showing agreement between the simulation and the experiment. By performing simulations of plasmonic near-field of NPs, our investigation revealed that the maximal electric field intensity does not occur precisely at the plasmonic resonant wavelength but rather at a nearby redder wavelength. The optimal size of the Au NP dispersed in water for achieving the highest field enhancement was found to be 60 nm, with an excitation wavelength of 553.7 nm. These interesting findings not only enrich our understanding of plasmonic NPs’ optical behavior but also guide researchers for potential applications in various domains.
揭示多分散溶液中的主导尺寸效应和金纳米粒子的最大电场增强效应
在本研究中,我们从理论和实验两方面系统地研究了混合溶液中大小金纳米粒子(Au NPs)的等离子效应及其作用。首先将小(10、30 nm)金纳米粒子与大(50、80 nm)金纳米粒子混合,制备出多分散溶液,然后使用紫外可见(UV-vis)光谱测量消光。实验结果清楚地表明,混合溶液的消光主要受大颗粒金氧化物的影响,尽管它们的数量很少。随后,我们进行了模拟,以探索不同尺寸金氧化物的等离子特性及其混合情况,并验证实验结果。为了解释实验观察和模拟结果之间消光光谱的偏差,我们建立了一个涉及球形 Au NPs 与椭圆形 NPs 混合的模拟模型,从而显示了模拟和实验之间的一致性。通过对 NPs 的等离子近场进行模拟,我们的研究发现,最大电场强度并不精确地出现在等离子共振波长处,而是出现在附近的较红波长处。研究发现,分散在水中的金 NP 的最佳尺寸为 60 nm,激发波长为 553.7 nm,从而获得最高的电场增强效果。这些有趣的发现不仅丰富了我们对等离子 NP 光学行为的理解,还为研究人员在各个领域的潜在应用提供了指导。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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