Bimetallic Au/Ag nanoparticles have been synthesized by laser ablation technique using a pulsed Nd:YAG laser with fundamental wavelength of 1064 nm. Initially, gold nanoparticles were synthesized in PVP solution by the ablation technique. For the generation of bimetallic Au/Ag nanoparticles, a silver plate was ablated for different time durations in the already synthesized colloidal gold nanoparticle solution. These source samples were further subjected to pulsed laser irradiation using a Q-switched frequency doubled Nd:YAG laser at a wavelength of 532 nm for varying time periods. Formation of the bimetallic nanoparticles was confirmed by Transmission Electron Microscopy (TEM) as well as absorption spectroscopy. Stability of the samples was established by the zeta potential analysis. Thermal diffusivity of the samples was determined using a dual-beam mode matched thermal lens technique at two different pump wavelengths. A systematic increase in the thermal diffusivity values was observed with increase in the ablation time of silver plate in gold nanoparticle solution which is attributed to the morphological variations occurring to the bimetallic nanoparticles. The effect of laser irradiation on the thermal diffusivity values was also investigated. An increase in thermal diffusivity was observed as the laser irradiation time increased due to the agglomeration of the bimetallic nanoparticles. The study can act as the basis for using plasmonic bimetallic nanoparticles as a nanoheat source in the medical field applications.

通过使用基本波长为1064 nm的脉冲Nd：YAG激光通过激光烧蚀技术合成了双金属Au / Ag纳米颗粒。最初，通过烧蚀技术在PVP溶液中合成了金纳米颗粒。为了生成双金属Au / Ag纳米粒子，在已经合成的胶体金纳米粒子溶液中烧蚀银板不同的时间。使用调Q倍频的Nd：YAG激光在532 nm波长下对这些源样品进行脉冲激光辐照，持续时间不同。通过透射电子显微镜（TEM）以及吸收光谱法证实了双金属纳米颗粒的形成。通过ζ电势分析确定样品的稳定性。使用双光束模式匹配热透镜技术在两个不同的泵浦波长下确定样品的热扩散率。随着银板在金纳米颗粒溶液中的消融时间的增加，观察到热扩散率值的系统增加，这归因于双金属纳米颗粒发生的形态变化。还研究了激光辐照对热扩散率值的影响。由于双金属纳米颗粒的团聚，随着激光照射时间的增加，观察到热扩散率的增加。该研究可作为在医疗领域应用等离激元双金属纳米颗粒作为纳米热源的基础。随着金纳米颗粒溶液中银板的消融时间增加，观察到热扩散率值的系统性增加，这归因于双金属纳米颗粒发生的形态变化。还研究了激光辐照对热扩散率值的影响。由于双金属纳米颗粒的团聚，随着激光照射时间的增加，观察到热扩散率的增加。该研究可作为在医疗领域应用等离激元双金属纳米颗粒作为纳米热源的基础。随着银板在金纳米颗粒溶液中的消融时间的增加，观察到热扩散率值的系统增加，这归因于双金属纳米颗粒发生的形态变化。还研究了激光辐照对热扩散率值的影响。由于双金属纳米颗粒的团聚，随着激光照射时间的增加，观察到热扩散率的增加。该研究可作为在医疗领域应用等离激元双金属纳米颗粒作为纳米热源的基础。还研究了激光辐照对热扩散率值的影响。由于双金属纳米颗粒的团聚，随着激光照射时间的增加，观察到热扩散率的增加。该研究可作为在医疗领域应用等离激元双金属纳米颗粒作为纳米热源的基础。还研究了激光辐照对热扩散率值的影响。由于双金属纳米颗粒的团聚，随着激光照射时间的增加，观察到热扩散率的增加。该研究可作为在医疗领域应用等离激元双金属纳米颗粒作为纳米热源的基础。