Dielectric function and electronic excitations of functionalized dna thin films

Hosuk Lee, Hosun Lee, Jung Eun Lee, U. Rha Lee, Dong Hoon Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We measure the dielectric functions of organic-soluble, functionalized DNAs bearing functional moieties in the near-infrared, visible, and ultraviolet spectra by using spectroscopic ellipsometry. Natural double-stranded DNA is dissolved in water and reacted with carbazole-based trimethyl ammonium bromide, cetyltrimethylammonium bromide, and chalcone-terminated trimethyl ammonium bromide. The functional DNA products are all precipitated and filtered for washing and drying. We successfully prepare functionalized DNAs that are insoluble in water but soluble in organic solvents. The thin films are fabricated by using the spin coating technique after preparing solutions in either homogeneous or mixed organic solvents. We measure the ultraviolet-visible absorbance spectra of the films. The absorbance spectra show that the optical energy gaps of the functionalized DNAs change little even though the DNAs are connected to the complex molecules by electrostatic interaction. From the measured ellipsometric angles, we estimate the dielectric functions by using parametric optical constant model and layer model analysis. Depending on the nature of the attached complex molecules, the dielectric functions change, new optical structures develop below and above band gaps arising from the side molecules, and the optical energy gaps of the DNAs are altered slightly by weak coupling to the tethered complex molecules.

Original languageEnglish
Pages (from-to)0616011-0616018
Number of pages8
JournalJapanese Journal of Applied Physics
Volume49
Issue number6 PART 1
DOIs
Publication statusPublished - 2010 Jun 1

Fingerprint

DNA
deoxyribonucleic acid
Thin films
thin films
electronics
excitation
Molecules
ammonium bromides
Energy gap
ultraviolet spectra
visible spectrum
Organic solvents
molecules
Bearings (structural)
Coating techniques
Optical constants
Spectroscopic ellipsometry
carbazoles
washing
Spin coating

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Dielectric function and electronic excitations of functionalized dna thin films. / Lee, Hosuk; Lee, Hosun; Lee, Jung Eun; Lee, U. Rha; Choi, Dong Hoon.

In: Japanese Journal of Applied Physics, Vol. 49, No. 6 PART 1, 01.06.2010, p. 0616011-0616018.

Research output: Contribution to journalArticle

Lee, Hosuk ; Lee, Hosun ; Lee, Jung Eun ; Lee, U. Rha ; Choi, Dong Hoon. / Dielectric function and electronic excitations of functionalized dna thin films. In: Japanese Journal of Applied Physics. 2010 ; Vol. 49, No. 6 PART 1. pp. 0616011-0616018.
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