Abstract

In this paper, we analyze the optical properties and sensitivities of spherical silver nanoparticles (AgNPs) with varying diameters (10–60 nm) in different surrounding medium, including water, ethanol, and chloroform. The investigation focuses on analytically assessing scattering efficiencies (\({{Q}_{{{\text{sca}}}}}\)), absorption efficiencies (\({{Q}_{{{\text{abs}}}}}\)), total extinction efficiencies (\({{Q}_{{{\text{ext}}}}}\)), shedding light on how the properties of AgNPs change with the size and surrounding medium of AgNPs. The results show that smaller AgNPs exhibit sharper plasmon resonance peaks at shorter wavelengths, while larger AgNPs display broader peaks in the visible spectrum, showcasing the size-dependent behavior of AgNPs. Additionally, the study calculates the molar attenuation coefficient (ε) and extinction cross section (\({{\sigma }_{{{\text{ext}}}}}\)) for AgNPs, highlighting the differences in absorption properties between small and large particles and their sensitivity to the surrounding medium. The research also discusses the implications of these properties for applications such as plasmonic sensing and sensor design, emphasizing the importance of particle size and surrounding medium in optimizing sensor performance. Moreover, the refractive index sensitivity (S) and the figure of merit (FOM) are introduced as critical parameters for assessing sensor performance, revealing their relationship with particle size, and providing valuable insights into sensor design and optimization.

中文翻译：

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单银纳米粒子：局部折射率对局部表面等离子共振和摩尔衰减系数的响应

摘要

在本文中，我们分析了不同直径（10-60 nm）的球形银纳米粒子（AgNP）在不同周围介质（包括水、乙醇和氯仿）中的光学性质和灵敏度。研究重点是分析评估散射效率 ( \({{Q}_{{{\text{sca}}}}}\) )、吸收效率 ( \({{Q}_{{{\text{abs} }}}}\) )，总消光效率 ( \({{Q}_{{{\text{ext}}}}}\) )，揭示 AgNP 的特性如何随尺寸和周围介质变化AgNPs。结果表明，较小的 AgNP 在较短的波长下表现出更尖锐的等离激元共振峰，而较大的 AgNP 在可见光谱中表现出更宽的峰，显示出 AgNP 的尺寸依赖性行为。此外，该研究还计算了 AgNP 的摩尔衰减系数 (ε) 和消光截面 ( \({{\sigma }_{{{\text{ext}}}}}\) )，突出了 AgNP 之间吸收特性的差异小颗粒和大颗粒及其对周围介质的敏感性。该研究还讨论了这些特性对等离子体传感和传感器设计等应用的影响，强调了颗粒尺寸和周围介质在优化传感器性能方面的重要性。此外，引入折射率灵敏度（S）和品质因数（FOM）作为评估传感器性能的关键参数，揭示它们与颗粒尺寸的关系，并为传感器设计和优化提供有价值的见解。