Photothermal Conversion and Laser-Induced Transformations in Silicon–Germanium Alloy Nanoparticles

IF 1.4 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2024-08-11 DOI:10.1134/S0021364024601398

S. O. Gurbatov, A. V. Shevlyagin, A. Yu. Zhizhchenko, E. B. Modin, A. A. Kuchmizhak, S. I. Kudryashov

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Abstract

Si_{1 –} _xGe_x alloy nanoparticles with controlled composition have been obtained by nanosecond laser ablation of silicon–germanium targets in isopropanol. The synthesized product exhibits a polycrystalline structure and a unimodal size distribution with a predominant content of microparticles and retains the stoichiometry of the composition of the targets used for the synthesis. Nanothermometry with the detection and analysis of a Raman signal from single alloy nanoparticles with a size of ~200 nm demonstrates a threefold increase (in comparison with nanoparticles of pure silicon) in the heating efficiency of a nanomaterial with the composition Si_0.45Ge_0.55 by 785-nm laser radiation falling into the first “transparency window” of biological tissues. Stimulated by continuous infrared radiation, the diffusion of silicon atoms to the surface (when heated to 650 K) and their oxidation lead to the gradual transformation of alloy nanoparticles into germanium clusters encapsulated in a SiO_x matrix.

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硅锗合金纳米粒子中的光热转换和激光诱导转变

通过纳秒激光烧蚀异丙醇中的硅锗靶，获得了成分可控的 Si1 - xGex 合金纳米粒子。合成产物呈现出多晶结构和单模态尺寸分布，主要含有微颗粒，并保持了合成所用靶材成分的化学计量学。通过检测和分析尺寸约为 200 纳米的单个合金纳米粒子的拉曼信号进行纳米测温，结果表明，与纯硅纳米粒子相比，成分为 Si0.45Ge0.55 的纳米材料在生物组织第一 "透明窗口 "内的 785 纳米激光辐射下的加热效率提高了三倍。在连续红外辐射的刺激下，硅原子向表面扩散（加热到 650 K 时）及其氧化作用导致合金纳米粒子逐渐转变为封装在氧化硅基质中的锗团块。

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来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.