Klekotko Magdalena, Olesiak-Banska Joanna, Matczyszyn Katarzyna
Advanced Materials Engineering and Modelling Group, Faculty of Chemistry, Wroclaw University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland.
J Nanopart Res. 2017;19(10):327. doi: 10.1007/s11051-017-4027-z. Epub 2017 Sep 24.
We report here the influence of the irradiation with femtosecond laser pulses on the gold nanoprisms synthesized using biological and chemical methods. For the bio-mediated growth, we used plant extract as a source of reducing, structure-directing, and stabilizing agents, while for the chemical method, we applied three-step protocol, involving chemicals commonly used in the synthesis of nanostructures. Exposition of the nanostructures to the laser beam causes morphological changes, which affect their extinction spectra. These modifications were followed using absorption spectroscopy and transmission electron microscopy. The observed effects depend on the applied laser power and excitation wavelength. Under resonance conditions, rounding of the tips of triangular nanoparticles and transformation towards more stable, spherical form were noticed. These changes were faster under higher laser power. Such shape modifications were weaker under off-resonance conditions. Moreover, chemically synthesized gold nanoprisms were less susceptible to the morphological changes than those obtained using plant extract; however, their colloidal stability was disrupted by long-time irradiation. Graphical abstractᅟ.
我们在此报告飞秒激光脉冲辐照对采用生物和化学方法合成的金纳米棱柱的影响。对于生物介导生长，我们使用植物提取物作为还原、结构导向和稳定剂的来源，而对于化学方法，我们采用了三步方案，涉及纳米结构合成中常用的化学物质。纳米结构暴露于激光束会导致形态变化，这会影响其消光光谱。使用吸收光谱和透射电子显微镜对这些变化进行了跟踪。观察到的效果取决于所施加的激光功率和激发波长。在共振条件下，注意到三角形纳米颗粒的尖端变圆并向更稳定的球形转变。在更高的激光功率下，这些变化更快。在非共振条件下，这种形状改变较弱。此外，化学合成的金纳米棱柱比使用植物提取物获得的金纳米棱柱对形态变化的敏感性更低；然而，它们的胶体稳定性会因长时间辐照而受到破坏。图形摘要ᅟ 。
