Photolithographic patterning of dendrimer monolayers and pattern-selective adsorption of linear macromolecules

J Nanosci Nanotechnol. 2005 Nov;5(11):1792-800. doi: 10.1166/jnn.2005.434.

Abstract

Alkyl groups of n-octadecyltrimethoxysilane (ODS) in a self-assembled monolayer on a silicon substrate were oxidized to carboxyl groups by partial irradiation of vacuum ultra-violet light under the photomask, producing a COOH/ODS line pattern. After active esterification of carboxyl groups, two kinds of amine-terminated dendrimers, poly(propyleneimine) and poly(amido amine) (PAMAM) dendrimers, were immobilized on a COOH line through amide-bond so that photolithographic dendrimer/ODS pattern was finally fabricated. Preparation was certified by atomic force microscopy (AFM) and surface-enhanced infrared absorption spectroscopy at transmission mode. Adsorption of linear macromolecules was examined on PAMAM dendrimer/ODS pattern. After adsorption of poly-L-glutamic acid (PGA) at a pH below alpha-helix--random coil transition, rod-shape texture was observed only on the dendrimer line in an AFM image. This texture is an aggregate of alpha-helical PGA. Sodium hyaluronate and DNA were also adsorbed selectively on the dendrimer line, keeping the line profile, although characteristic textures were not observed.

MeSH terms

  • Adsorption
  • Amines / chemistry
  • Biocompatible Materials / chemistry
  • DNA / chemistry
  • Dendrimers
  • Electrochemistry
  • Hyaluronic Acid / chemistry
  • Hydrogen Bonding
  • Hydrogen-Ion Concentration
  • Macromolecular Substances / chemistry
  • Microscopy, Atomic Force
  • Nucleic Acid Conformation
  • Organosilicon Compounds / chemistry*
  • Polyamines / chemistry
  • Polyglutamic Acid / chemistry
  • Polymers / chemistry
  • Silicon / chemistry
  • Spectrophotometry
  • Surface Properties
  • Ultraviolet Rays

Substances

  • Amines
  • Biocompatible Materials
  • Dendrimers
  • Macromolecular Substances
  • Organosilicon Compounds
  • PAMAM Starburst
  • Polyamines
  • Polymers
  • Polyglutamic Acid
  • n-octadecyltrimethoxysilane
  • Hyaluronic Acid
  • DNA
  • Silicon