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Optical dispersion control in surfactant-free DNA thin films by vitamin B₂ doping.

ABSTRACT: A new route to systematically control the optical dispersion properties of surfactant-free deoxyribonucleic acid (DNA) thin solid films was developed by doping them with vitamin B₂, also known as riboflavin. Surfactant-free DNA solid films of high optical quality were successfully deposited on various types of substrates by spin coating of aqueous solutions without additional chemical processes, with thicknesses ranging from 18 to 100?nm. Optical properties of the DNA films were investigated by measuring UV-visible-NIR transmission, and their refractive indices were measured using variable-angle spectroscopic ellipsometry. By doping DNA solid films with riboflavin, the refractive index was consistently increased with an index difference ?n???0.015 in the spectral range from 500 to 900?nm, which is sufficiently large to make an all-DNA optical waveguide. Detailed correlation between the optical dispersion and riboflavin concentration was experimentally investigated and thermo-optic coefficients of the DNA-riboflavin thin solid films were also experimentally measured in the temperature range from 20 to 85?°C, opening the potential to new bio-thermal sensing applications.

SUBMITTER: Paulson B

PROVIDER: S-EPMC6008429 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Optical dispersion control in surfactant-free DNA thin films by vitamin B<sub>2</sub> doping.

Paulson Bjorn B Shin Inchul I Jeong Hayoung H Kong Byungjoo B Khazaeinezhad Reza R Dugasani Sreekantha Reddy SR Jung Woohyun W Joo Boram B Lee Hoi-Youn HY Park Sungha S Oh Kyunghwan K

Scientific reports 20180619 1

A new route to systematically control the optical dispersion properties of surfactant-free deoxyribonucleic acid (DNA) thin solid films was developed by doping them with vitamin B<sub>2</sub>, also known as riboflavin. Surfactant-free DNA solid films of high optical quality were successfully deposited on various types of substrates by spin coating of aqueous solutions without additional chemical processes, with thicknesses ranging from 18 to 100 nm. Optical properties of the DNA films were inves ...[more]

PMID: 29921918

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Project description:Delafossite materials are considered to be a promising range of transparent conductive oxides for optoelectronic applications. The complications that have held back their implementation in practical devices lie in the complex growth methods that are required and in the formation of undesirable secondary phases. Herein, a fast, simple, and low-cost deposition method allowing the deposition of high-quality 2H-CuFeO2 nanostructured thin films is employed. The effect of Sr doping on the properties of spray-coated CuFeO2 thin film annealed at 850 °C is reported. X-ray diffraction (XRD) analysis revealed the delafossite structures of all the samples corresponding to the 2H-CuFeO2 phase. The lattice spacing decreased with increasing substitution of Sr at the Cu site. Raman analysis further authenticated the structural results collected via XRD analysis. Surface scanning using field-emission scanning electron microscopy revealed the formation of nanostructured CuFeO2 thin film possessing high crystalline quality, with the nanocrystal size increasing as the dopant content was increased. Energy-dispersive X-ray analysis allowed the quantification of the elements content via determining the ratios of the main elements as well as the dopant content in each sample. The optical properties of the samples showed strong light absorption in the visible region with a decrease in the band gap values with Sr insertion. First-principles calculations using density functional theory (DFT) were conducted to strengthen the experimental findings regarding the nature of the bonds in the hexagonal lattice of the CuFeO2 compound and the effect of Sr doping on its characteristics. The electrical properties measured at room temperature revealed p-type conductivity with tunable resistivity, while the samples displayed increased electron mobility as a function of the dopant content. Consequently, our work introduced an efficient and cost-effective synthesis route for the preparation of high-quality nanostructured 2H-CuFeO2 thin films, paving the way to facilitate further device applications.

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Optical dispersion control in surfactant-free DNA thin films by vitamin B₂ doping.

Publications

Optical dispersion control in surfactant-free DNA thin films by vitamin B<sub>2</sub> doping.

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Optical dispersion control in surfactant-free DNA thin films by vitamin B2 doping.

Publications

Optical dispersion control in surfactant-free DNA thin films by vitamin B<sub>2</sub> doping.

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OmicsDI is part of the ELIXIR infrastructure

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Optical dispersion control in surfactant-free DNA thin films by vitamin B₂ doping.