Abstract

The optical properties of nanocomposite particles consisting of silicon cores about 100 nm in size with smaller gold nanoparticles deposited on their surface have been studied. An increase in the absorption of light in the nearinfrared region of the spectrum for the obtained nanoparticles is observed in comparison with that for nanoparticles of pure silicon or gold. Experiments on measuring the temperature of aqueous suspensions showed significantly higher rates of photoheating of nanocomposite particles upon irradiation with laser radiation at a wavelength of 810 nm compared to the case of pure silicon nanoparticles. Calculations of the distribution of the electric field showed multiple increases in its strength near nanocomposite particles upon irradiation with light in the visible and near-infrared ranges and also made it possible to find the scattering and absorption contributions to the extinction spectra of nanoparticle suspensions. The observed enhanced photoheating of nanocomposite particles can be used for application in antibacterial treatment and cancer hyperthermia.

中文翻译：

---

沉积金的硅基纳米复合颗粒水悬浮液的光学性质和光加热

摘要

研究人员研究了由尺寸约为 100 nm 的硅核和沉积在其表面的较小金纳米颗粒组成的纳米复合颗粒的光学特性。与纯硅或金的纳米粒子相比，观察到所获得的纳米粒子在光谱的近红外区域中的光吸收增加。测量水悬浮液温度的实验表明，与纯硅纳米颗粒相比，在波长为 810 nm 的激光辐射照射下，纳米复合颗粒的光加热速率明显更高。对电场分布的计算表明，在可见光和近红外范围内的光照射下，纳米复合颗粒附近的电场强度成倍增加，并且还可以找到散射和吸收对纳米颗粒悬浮液消光光谱的贡献。观察到的纳米复合颗粒的增强光热可用于抗菌治疗和癌症热疗。