title: Facile Preparation of Ultrasmall Void Metallic Nanogap from Self-Assembled Gold-Silica Core-Shell Nanoparticles Monolayer via Kinetic Control.
abstract: A facile preparation of ultrasmall 1-2 nm void metallic nanogaps on various solid substrates is proposed by utilizing the self-assembly of a uniform gold-silica core-shell nanoparticle monolayer at interfaces and chemical etching. The ultrasmall void metallic nanogap shows key advantages such as a strong near-field enhancement and free diffusion of analytes to the gap, which are useful in molecular sensing and monitoring.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea.
authors.forename: Yuna
authors.initials: Y
authors.lastname: Shin
authors.affiliation: Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Korea.
authors.forename: Jihwan
authors.initials: J
authors.lastname: Song
authors.affiliation: Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Korea.
authors.forename: Dongchoul
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea.
authors.forename: Taewook
authors.initials: T
authors.lastname: Kang
keywords: gold-silica core-shell nanoparticles; interfacial self-assembly; kinetic control; surface-enhanced Raman spectroscopy; void metallic nanogaps