Insight on agglomerates of gold nanoparticles in glass based on surface plasmon resonance spectrum: study by multi-spheres T-matrix method
Insight on agglomerates of gold nanoparticles in glass based on surface plasmon resonance spectrum: study by multi-spheres T-matrix method
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DOI：
10.1088/1361-648x/aa9fcc
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发表时间：
2018-01-31
影响因子：
2.7
通讯作者：
Bugaev, L. A.
中科院分区：
文献类型：
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作者：
Avakyan, L. A.;Heinz, M.;Bugaev, L. A.
采用 T 矩阵方法研究了硅酸盐浮法玻璃表面层中随机分布的金纳米粒子的局域表面等离子体共振 (SPR) 谱的形成，该金纳米粒子是通过紫外 ArF 准分子激光照射溅射涂覆在玻璃表面上的薄金层而产生并植入的，该方法能够考虑粒子团聚。所使用的实验技术有望在不损坏玻璃表面的情况下生产等离子体纳米颗粒的亚微米图案（由激光掩模或光栅提供）。通过计算不同排列和结构的金纳米粒子（溶液中的金纳米粒子、粒子对和核壳银-金纳米粒子）的SPR特性，分析了多球T矩阵（MSTM）方法对所研究材料的适用性，对于这些模型，可以使用实验数据或其他方法的建模结果。对于玻璃中的金纳米粒子的研究表明，其SPR光谱的理论描述需要考虑粒子之间的等离子体耦合，这可以通过MSTM计算有效地完成。获得的颗粒尺寸和颗粒间距离的统计分布证明了所考虑颗粒数量的饱和行为，这使我们能够确定足以形成 SPR 谱的有效颗粒聚集体。建议的技术是通过在 MSTM 方法的重复计算光谱中改变颗粒聚集体的几何参数来拟合玻璃中金纳米颗粒的实验 SPR 光谱，使我们能够确定聚集体的统计特征：颗粒之间的平均距离、平均尺寸和颗粒的尺寸分布。这里提出的 SPR 光谱的拟合策略可以应用于任何性质和各种物质中的纳米颗粒，并且原则上可以扩展到非球形颗粒，如椭圆体、棒状和其他 T 矩阵可解形状。
The formation of a localized surface plasmon resonance (SPR) spectrum of randomly distributed gold nanoparticles in the surface layer of silicate float glass, generated and implanted by UV ArF-excimer laser irradiation of a thin gold layer sputter-coated on the glass surface, was studied by the T-matrix method, which enables particle agglomeration to be taken into account. The experimental technique used is promising for the production of submicron patterns of plasmonic nanoparticles (given by laser masks or gratings) without damage to the glass surface. Analysis of the applicability of the multi-spheres T-matrix (MSTM) method to the studied material was performed through calculations of SPR characteristics for differently arranged and structured gold nanoparticles (gold nanoparticles in solution, particles pairs, and core-shell silver-gold nanoparticles) for which either experimental data or results of the modeling by other methods are available. For the studied gold nanoparticles in glass, it was revealed that the theoretical description of their SPR spectrum requires consideration of the plasmon coupling between particles, which can be done effectively by MSTM calculations. The obtained statistical distributions over particle sizes and over interparticle distances demonstrated the saturation behavior with respect to the number of particles under consideration, which enabled us to determine the effective aggregate of particles, sufficient to form the SPR spectrum. The suggested technique for the fitting of an experimental SPR spectrum of gold nanoparticles in glass by varying the geometrical parameters of the particles aggregate in the recurring calculations of spectrum by MSTM method enabled us to determine statistical characteristics of the aggregate: the average distance between particles, average size, and size distribution of the particles. The fitting strategy of the SPR spectrum presented here can be applied to nanoparticles of any nature and in various substances, and, in principle, can be extended for particles with non-spherical shapes, like ellipsoids, rod-like and other T-matrix-solvable shapes.