2차원 및 3차원 구조의 금속 나노와이어 형성

Abstract

Two-dimensional (2D) and three-dimensional (3D) metal hierarchical structures have attracted significant attention since such materials advance exciting applications in data storage and photonic crystals for surface-enhanced Raman spectroscopy (SERS) substrate. In order to fabricate 2D metal nanostructure, direct atomic force microscopy (AFM) lithographic technique was utilized and n-tridecylamine hydrochloride (TDA?HCl) self-assembled monolayer (SAM) was modified on a substrate as an intermediate layer. Uniform pattern of cobalt was successfully fabricated with the full width half maximum (FWHM) and height of 127 nm and 4 nm for wire, and 124 nm and 2.6 nm for dot pattern, respectively. And the residue on non-patterned area was removed clearly. It was characterized by AFM topography and magnetic force microscopy (MFM) image. Also, 3D metal structure was demonstrated by operating wet chemical and physical deposition method. Suspended 3D networks of single-walled carbon nanotubes (SWNTs) were used as 3D tebn mplate, followed by silver and gold was localized along suspended SWNTs for performing 3D metal net. This method is very simple and easy to handle because metal is simply coated on as-prepared 3D SWNT networks. Accomplished 3D silver and gold net was introduced to study of Raman signal enhancement. The enhancement was advantaged to the 3D structure, and the metal particles in large size which causes nucleation for wire like shape.