Formation of hollow gold nanocrystals by nanosecond laser irradiation
Autor
González-Rubio, Guillermo
Milagres de Oliveira, Thais
Albrecht, Wiebke
Díaz-Núñez, Pablo
Castro-Palacio, Juan C.
Prada, Alejandro
González, Rafael I.
Scarabelli, Leonardo
Bañares, Luis
Rivera, Antonio
Liz-Marzán, Luis M.
Peña-Rodríguez, Ovidio
Bals, Sara
Guerrero-Martínez, Andrés
Fecha
2020Resumen
The irradiation of spherical gold nanoparticles (AuNPs) with nanosecond laser pulses induces shape transformations yielding nanocrystals with an inner cavity. The concentration of the stabilizing surfactant, the use of moderate pulse fluences, and the size of the irradiated AuNPs determine the efficiency of the process and the nature of the void. Hollow nanocrystals are obtained when molecules from the surrounding medium (e.g., water and organic matter derived from the surfactant) are trapped during laser pulse irradiation. These experimental observations suggest the existence of a subtle balance between the heating and cooling processes experienced by the nanocrystals, which induce their expansion and subsequent recrystallization keeping exogenous matter inside. The described approach provides valuable insight into the mechanism of interaction of a pulsed nanosecond laser with AuNPs, along with interesting prospects for the development of hollow plasmonic nanoparticles with potential applications related to gas and liquid storage at the nanoscale.
Fuente
Journal of Physical Chemistry Letters, 11(3), 670-677Link de Acceso
Click aquí para ver el documentoIdentificador DOI
doi.org/10.1021/acs.jpclett.9b03574Colecciones
La publicación tiene asociados los siguientes ficheros de licencia: