title: Light-Induced Polarization-Directed Growth of Optically Printed Gold Nanoparticles.
abstract: 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 HAuCl4. 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.
authors.affiliation: Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Godoy Cruz 2390, C1425FQD Ciudad de Buenos Aires, Argentina.
authors.forename: Ianina L
authors.initials: IL
authors.lastname: Violi
authors.affiliation: Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Godoy Cruz 2390, C1425FQD Ciudad de Buenos Aires, Argentina.
authors.forename: Julián
authors.initials: J
authors.lastname: Gargiulo
authors.affiliation: Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Godoy Cruz 2390, C1425FQD Ciudad de Buenos Aires, Argentina.
authors.forename: Catalina
authors.initials: C
authors.lastname: von Bilderling
authors.affiliation: Centro de Investigaciones en Bionanociencias (CIBION), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) , Godoy Cruz 2390, C1425FQD Ciudad de Buenos Aires, Argentina.
authors.forename: Emiliano
authors.initials: E
authors.lastname: Cortés
authors.affiliation: 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.
authors.forename: Fernando D
authors.initials: FD
authors.lastname: Stefani
keywords: Nanofabrication; optical forces; plasmon assisted chemistry; polarization