中文摘要：

金（Au）、银（Ag）纳米结构在近红外区中存在较强的可控表面等离子体共振吸收特性。利用近红外光的光-热效应，Au，Ag纳米结构在近红外特定波长激光的照射下，较高的光-热转换效率能达到光热治疗的要求。文中分别利用“种子”法和水热法合成了纵向表面等离子共振（Longitudinal surface plasman resonance，SPRI，）峰在650～1100nm范围可调的Au纳米棒和SPR峰在650～850nm范围的Ag纳米结构。在近红外（如808，1064nm）激光照射下，通过改变激光功率、照射时间，记录胶体溶液的温度变化，并与水在相同辐照条件下的温度变化对比。SPR。下，805nm的Au纳米棒胶体溶液在小功率（0．8w）808nm激光照射下，溶液温度可从室温升高到约57℃；在高功率激光（1064nm，8w）辐照下，Au纳米棒很快退化成颗粒，SPR。吸收峰消失。Ag纳米片和Ag纳米立方体在808nm激光（〉1w）辐照下，均具有一定的光-热效率，但效率都低于Au纳米棒胶体的光-热效率。三角形Ag纳米片在激光作用下出现截角或枝晶，而Ag纳米立方体无明显变化。

英文摘要：

Gold and silver nanostructures （such as Au nanorods, Ag nanoplates, nanocubes and so on） exhibit strong and tunable surface plasmon resonance in the near-infrared region （NIR）. Under a certain NIR laser irradiation, noble metal nanostructrues achieve a high photo-thermal effect, which would be useful in the therapy. Au nanorods with longitudinal surface plasmon resonance （SPRL） shifting in the region of 650--1 100 nm are synthesized by a ＂seed＂ method. Ag nanoplates and nanocubes with SPR lo- cated in the region of 650--850 nm are produced by a hydrothermal method. Through adjusting laser power and irradiating time, the changes of colloids are studied under NIR laser irradiation, and then the changes are compared with that of water. Under low power laser irradiation （808 nm, ~1 W）, temper- ature of Au nanorods colloid increases to about 5？ ~C. While Au nanorods undergo deformation from rod to spherical particle under irradiation of high power （1 064 nm, 8 W）, resulting in the disappearance of SPRL. Under 808 nm NIR laser irradiation, morphology evolutions and photo-thermal conversion of Ag nanostructures are also studied with change of power and irradiation time. Ag nanostructures have a lower photo-thermal conversion compared with that of Au nanorods colloid. Snipping and dendrite can be observed for Ag nanoplates after irradiating, while Ag nanocubes have no obvious shape change.