Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Godoy Cruz 2390, C1425FQD Ciudad de Buenos Aires, Argentina.
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires , Güiraldes 2620, C1428EAH Ciudad de Buenos Aires, Argentina.
Nano Lett. 2016 Oct 12;16(10):6529-6533. doi: 10.1021/acs.nanolett.6b03174. Epub 2016 Sep 23.
Optical printing has been proved a versatile and simple method to fabricate arbitrary arrays of colloidal nanoparticles (NPs) on substrates. Here, we show that is also a powerful tool for studying chemical reactions at the single NP level. We demonstrate that 60 nm gold NPs immobilized by optical printing can be used as seeds to obtain larger NPs by plasmon-assisted reduction of aqueous HAuCl. The final size of each NP is simply controlled by the irradiation time. Moreover, we show conditions for which the growth occurs preferentially in the direction of light polarization, enabling the in situ anisotropic reshaping of the NPs in predetermined orientations.
光印刷已被证明是一种通用且简单的方法，可以在基底上制造任意胶体纳米粒子（NPs）的阵列。在这里，我们表明它也是研究单个 NP 水平的化学反应的有力工具。我们证明，通过等离子体辅助还原水合 HAuCl，用光印刷固定的 60nm 金 NPs 可以用作种子来获得更大的 NPs。每个 NP 的最终尺寸仅通过照射时间来控制。此外，我们还展示了在哪个条件下优先沿光偏振方向发生生长，从而能够在预定方向原位各向异性地重塑 NPs。
