Electrostatic assembly of gold colloidal nanoparticles on organosilane monolayers patterned by microcontact electrochemical conversion.
A new approach is introduced for electrostatically guided adsorption of colloidal nanoparticles onto a patterned self-assembled monolayer (SAM) with feature sizes ranging from nm to mm. Patterning of the adsorption templates is realized by electric-field-induced anodic oxidation of aminosilane SAM using an ink-free method. In this versatile method, both "positive" and "negative" type pattern transfers are possible. The chemically converted patterns are induced by localized electrical fields on the microcontacted areas, and the patterning resolution is insensitive to the diffusion of oxidizing agents because of the self-limiting oxidation kinetics, thereby enabling high-resolution, large-scale parallel patterning.
Chen
Chi-Fan
CF
Department of Physics and Institute of MEMS, National Tsing-Hua University, Hsinchu 300, Taiwan, R O C.
Tzeng
Shien-Der
SD
Lin
Meng-Hsien
MH
Gwo
Shangjr
S