Location Control of Nanoparticles Using Combination of Top-down and Bottom-up Nano-fabrication

Abstract

Metal and semiconductor nanoparticles attract much interest owing to their specific properties because they are expected as next generation electronic materials for display and LED, catalyst of solar cells, fluorescent marker in medical field, color material, optical limiter and so on. In particular, metal nanoparticle is expected as small-sized electronic devices such as single electron transistors, biosensing application and so on. In order to develop novel devices and biosensing application, it is essential to construct ordered structure of the nanoparticles on solid substrate. In particular, gold (Au) and silver nanoparticles, which covalently linked to biomolecules such as DNA, peptides, nucleic acids, proteins, and cell have attracted much attention for biosensing and bioimaging application. In this study, the location control of nanoparticles was successfully performed by the combination of top-down nano-fabrication such as lithography and bottom-up nano-fabrication such as self-assembly. The number of Au nanoparticle attatchment to water-soluble dithiol SAMs can be easily controlled by the length of SAMs.

Position Control of Metal Nanoparticles by Self-Assembly

“…Patterning self-assembled material is typically achieved by covering the Au nano-patterns through lift-off of block copolymer template. A SAM such as poly(ethylene glycol) dithiol were used in order to investigate attachment behavior of Au nanoparticles on Au nanopatterns as previous reported [22][23][24]. The resulting patterned SAM is used as a binding layer for the spatially selective assembly of Au nanoparticles.…”

“…In previous study, we succeeded in a novel and simple method of fabricating patterned arrays of Au nanoparticles on a nanoscale reaction field by combining EB lithography and self-assembly techniques [22][23][24].…”

Controlled Array of Silver Nanoparticles on Nanopatterns

“…In previous study, we succeeded in location control of Au nanoparticles using combination of top-down and bottom-up nanofabrication. [21] Our purpose is single-molecular observation such as DNA, peptides, nucleic acids, proteins and cell using this technique. For this purpose, we investigated the attachment of silver nanoparticles on Au nanopattern.…”

Controlled Array of Gold Nanoparticles by Combination of Nano Imprint and Self-assembly

“…Then, resulting Au nanopattern including dots and lines after the Au deposition and the lift-off process was covered with the SAMs by standard immersion procedure. A SAM such as poly(ethylene glycol) dithiol were used in order to attach Au nanoparticles on Au nanopatterns as previous reported [15][16][17][18][19]. The resulting patterned SAM is used as a binding layer for the spatially selective assembly of Au nanoparticles.…”

“…In previous study, we succeeded in a novel and simple method of fabricating controlled arrays of Au nanoparticles on a nanoscale reaction field by combining EB lithography and self-assembly techniques [15][16][17]. Also, we succeeded in controlled arrangement of Au nanoparticles capped with protecting ligand on Au nanopatterns [18] Furthermore, we succeessfully controlled the position of Au nanoparticles on a nanoscale reaction field by using self-assembly techniques [19].…”