光辐照精确调控金纳米星枝杈长度及其光热性能探究

发布时间：2018-07-16 16:33

【摘要】：金纳米星是一种具有尖状结构的多分枝纳米颗粒.为了使金纳米星枝杈长度可控,利用HEPES作为体系的还原剂、稳定剂及形状诱导剂,在制备过程中进行光辐照,得到的金纳米星枝杈长度比无光辐照时的金纳米星枝杈长度短,而且不同波长光辐照得到的金纳米星枝杈长度有显著不同.在此基础上,分析了金纳米星枝杈长度变化的物理过程,提出光诱导金纳米星生长过程中枝杈长度变化的理论模型.测量了不同枝杈长度的金纳米星在光辐照下一定时间内的温度变化,计算了金纳米星的光热转换效率.实验结果表明,光辐照制备金纳米星能够精确控制金纳米星枝杈长度范围,从而调控金纳米星的光热转换效率.
[Abstract]:Gold nanoparticles are multi-branched nanoparticles with pointed structure. In order to make the length of the branches of gold nanometers controllable, the length of branches of gold nanosars obtained by using HEPES as reducing agent, stabilizer and shape inducer during the preparation process was shorter than that of gold nanospace branches without light irradiation. Moreover, the length of branches of gold nanoscale stars irradiated by different wavelengths of light is significantly different. On this basis, the physical process of the length variation of branches of gold nanometers is analyzed, and a theoretical model of the length variation of branches in the process of photoinduced growth of gold nanosars is proposed. The temperature changes of gold nanocrystals with different branching lengths were measured under light irradiation for a certain time. The photothermal conversion efficiency of gold nanometers was calculated. The experimental results show that the photothermal conversion efficiency of gold nanocrystals can be controlled by controlling the length of the branching of gold nanocrystals accurately.
【作者单位】：北京工业大学激光工程研究院;
【基金】：国家自然科学基金(批准号:51475014)资助的课题~~
【分类号】：O614.123;TB383.1

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