生物传感器中的氧化物涂层贵金属纳米粒子:分析建模和离散偶极近似法

IF 0.9 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Physics of the Solid State Pub Date : 2024-10-02 DOI:10.1134/S1063783424600833
Adil Bouhadiche, Soulef Benghorieb
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引用次数: 0

摘要

贵金属纳米粒子(NMNPs),如金和银,因其独特的性质,包括高稳定性、易化学合成、可调表面功能化和等离子特性,已在科学和技术的各个领域得到广泛研究。研究人员利用它们制造生物传感器。事实上,生物传感器已受到广泛关注,因为它们可以制造小型便携式设备。生物传感器产业已经发展壮大;设计人员试图改进和加强其检测特性,并缩小其体积。通常使用酶来提供高选择性和高灵敏度,但酶的保质期短成为一个主要缺点。科学家们试图寻找其他材料来替代酶,使其具有长期稳定性并适用于生物传感器。在传感设备中替代酶的纳米粒子和金属氧化物是实现高选择性和高灵敏度的最佳候选材料。在此,将不同形状和大小的贵金属纳米粒子(包括纳米球、纳米线、纳米立方体和纳米圆柱体)分散在具有不同折射率的周围介质中,通过离散偶极子近似(DDA)方法研究其表面等离子峰的响应。为此,我们提出了一个模拟模型,用于计算所考虑的 NPs 的等离子特性,并给出了分析公式。研究发现,折射率灵敏度 (RIS) 取决于纳米粒子的形状、大小、核心材料、外壳厚度和外壳成分。与基于银和铝的纳米传感器相比,基于金纳米粒子(AuNPs)的 LSPR 传感器的折射率灵敏度最低,为 93.33 nm/RIU(银)> 46 nm/RIU(铝)> 26 nm/RIU(金),X = 5 nm。数字数据清楚地解释了为什么银是传感应用的首选等离子体材料。
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Oxide Coated Noble Metal Nanoparticles in Biosensors: Analytical Modeling and Discrete Dipole Approximation Method

Noble metal nanoparticles (NMNPs), such as gold and silver, have been studied extensively in various fields in science and technology due to their peculiar properties, including high stability, easy chemical synthesis, tuneable surface functionalization and plasmonic property. Researchers have used them to fabricate biosensors. Indeed, biosensors have received a lot of attention because they enable the production of small, portable devices. The biosensor industry has grown; design attempts to improve and strengthen their detection characteristics and reduce their volumes. Enzymes are generally used to provide high selectivity and sensitivity; however, their short shelf life becomes a major drawback. Scientists have tried to find other materials to replace enzymes; having long-term stability and suitability for biosensors. Nanoparticles and metal oxides substituting enzymes in sensing devices represent the best candidate to achieve high selectivity and sensitivity. Herein, coated noble metal nanoparticles of various shapes and sizes, including nanospheres, nanowires, nanocubes and nanocylinders, are dispersed in surrounding media with different refractive indices to study, via the discrete dipole approximation (DDA) method, the response of their surface plasmon peaks. For this, a simulation model is proposed for the calculations of the plasmonic properties of the considered NPs, and analytical formulas are presented. The refractive index sensitivities (RISs) have been found to depend on the shape, size, core material, shell thickness and shell composition of the nanoparticles. LSPR sensors based on gold nanoparticles (AuNPs) exhibit the lowest RISs compared to the Ag and Al based nanosensors with a value of 93.33 nm/RIU (Ag) > 46 nm/RIU (Al) > 26 nm/RIU (Au), X = 5 nm. Numerical data clearly explain why silver is the plasmon material of choice for sensing applications.

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来源期刊
Physics of the Solid State
Physics of the Solid State 物理-物理:凝聚态物理
CiteScore
1.70
自引率
0.00%
发文量
60
审稿时长
2-4 weeks
期刊介绍: Presents the latest results from Russia’s leading researchers in condensed matter physics at the Russian Academy of Sciences and other prestigious institutions. Covers all areas of solid state physics including solid state optics, solid state acoustics, electronic and vibrational spectra, phase transitions, ferroelectricity, magnetism, and superconductivity. Also presents review papers on the most important problems in solid state physics.
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