Fabrication of nanopatterned DNA films by Langmuir-Blodgett technique

TL;DR

This study demonstrates the fabrication of fractal-like nanopatterned DNA films on mica using the Langmuir-Blodgett technique, analyzing their structure, growth mechanism, and potential for nanocomposite applications.

Contribution

It introduces a method to control DNA nanopatterns via surface pressure and explores their use as templates for metal patterning.

Findings

Surface pressure influences DNA nanopattern morphology.

Fractal-like structures follow diffusion-limited aggregation model.

DNA networks serve as templates for metal nanopatterns.

Abstract

Fractal-like nanopatterned DNA thin films have been fabricated on mica substrate by Langmuir-Blodgett (LB) technique. Structures and components of DNA nanopatterns were investigated using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The effect of surface pressure on the transferred DNA composite films has been studied. Scanning force microscopic observations revealed that the surface structure and morphology of DNA nanopatterns can be well controlled by changing the surface pressure. The growth mechanism of the fractal-like nanopatterns is discussed in terms of the diffusion-limited aggregation (DLA) model. The formation of large-scale DNA networks provided a well-defined template for the construction of nanocomposite films. Patterns of silver metal were prepared on DNA networks by subsequent metallization process.