Self-assembled monolayer as a template to deposit silicon nanoparticles fabricated by laser ablation

We demonstrate a use of self-assembled monolayer (SAM) as a template to dep osit in-situ Si nanoparticles fabricated by laser ablation. Scanning tunnel ing microscopy, atomic force microscopy observations, and photoluminescence measurements show that the Si nanoparticles deposited in situ on SAMs are round shaped, firmly attached to the surface, and remain stable for at leas t a couple of months. Control over the average size of the Si nanoparticles could be achieved, in the region where quantum confinement effect is impor tant, by changing the Ar ambient pressure. Our results show that SAM endure s the fierce heat, ions, and plasma generated during the laser ablation pro cess, and the use of SAM could be extended as a substrate to deposit in-sit u materials fabricated by laser ablation. In-situ deposition is important b ecause it would facilitate fabrication of high functional nanoarchitectures based on this easily oxidized material. We believe that the wide range of available SAMs, different in chemical and electronic functionality, combine d with the wide variety of nanostructures possible to fabricate by laser ab lation, would open up a new opportunity to assemble these nanomaterials int o high functional complexities of the next level.