DNA biopolymer hybrids have been investigated for energy storage applications and also as potential high k gate dielectrics in bioelectronics applications such as BioFETs. DNA-based hybrid films incorporating sol-gel-derived ceramics have shown strong promise as insulating dielectrics for high voltage capacitor applications. Our studies of DNA-CTMA complex/sol-gel hybrid thin film devices have demonstrated reproducibility and stability in temperature-and frequency-dependent dielectric properties as well as reliability in DC voltage breakdown measurements, attaining values consistently in the 300 - 350 V/um range. We have also investigated DNA-inorganic hybrids by ex situ blending of aqueous solutions of DNA with high k ceramics such as BaTiO3 and TiO2. These systems are currently being investigated as potential gate dielectrics for BioFETs by virtue of their relatively high dielectric constant, high DC electrical resistivity, and lower leakage currents than pristine DNA. Functionally layered devices have also been designed, fabricated and characterized to determine any added benefit in dielectric applications. The electrical/dielectric characteristics of DNA and DNA-CTMA with sol-gel-derived ceramics, high k ceramic fillers, and in layered devices were examined to determine their effect on vital dielectric parameters for energy storage and bioelectronics applications.
KEYWORDS: Curium, Energy transfer, Energy efficiency, Molecular energy transfer, Optoelectronics, Fluorescence resonance energy transfer, Molecules, Luminescence, Polymethylmethacrylate, Bioalcohols
Aside from salmon DNA, other DNA sources were explored namely, herring and onion, to prepare DNAsurfactant
complex, which will be used as a template for dyes undergoing Forster Resonance Energy
Transfer (FRET). Also, salmon DNA of low and high molecular weight were compared. This study aims to
assess the effect of using different DNA sources and molecular weight on the efficiency of energy transfer
between the dyes, coumarin 480 (Cm 480) and 4-[4-(dimethylamino)styryl]-1-docosyl-pyridinium bromide
(Hemi 22 and to understand the fundamental properties of DNA-CTMA as a supporting matrix for
optoelectronics applications.
In this study, highly stable aqueous solutions of blends containing Deoxyribonucleic acid (DNA) and high k ceramics (BaTiO3 or TiO2) nanoparticles were processed. Dielectric and electrical properties of the as-prepared nanocomposites thin films were investigated. Dielectric Constant k values of 14 and capacitance density of 2.5 nF/cm2 were achieved for a 40 wt.% BaTiO3 loading at 1 KHz. The current-voltage (IV) measurements revealed electrical resistivity in the order of 1014 Ohm-cm with leakage current densities of the order of 10-9 A/cm2 for electric field biases up to 50V/μm.
DNA-based bio-dielectrics incorporating sol-gel have been investigated for energy storage applications. Salmon DNA hybrid films blending sol-gel-ceramics with DNA-CTMA have potential for increased dielectric constants and higher environmental stability compared to DNA only films. Thin film capacitor devices were fabricated and characterized, showing stability in dielectric properties and reliability in voltage breakdown measurements, attaining values consistently at 300 V/um. Temperature-dependent dielectric properties as well as dielectric stability as a function of thermal cycling of these hybrid films are also discussed.
The potential of DNA-based dielectrics for energy storage applications was explored via the incorporation of high
dielectric constant (ε) ceramics such as TiO2 (rutile) and BaTiO3 in the DNA bio-polymer. The DNA-Ceramic
hybrid films were fabricated from stable suspensions of the nanoparticles in aqueous DNA solutions. Dielectric
characterization revealed that the incorporation of TiO2 (rutile) in DNA resulted in enhanced dielectric constant
(14.3 at 1 kHz for 40 wt % TiO2) relative to that of DNA in the entire frequency range of 1 kHz-1 MHz. Variable
temperature dielectric measurements, in the 20-80°C range, of both DNA-TiO2 and DNA-BaTiO3 films, revealed
that the ceramic additive stabilizes DNA against large temperature-dependent variations in both ε and the dielectric
loss factor tan δ. The bulk resistivity of the DNA-Ceramic hybrid films, in the case of both TiO2 and BaTiO3
additives in DNA, was measured to be two to three orders of magnitude higher than that of the control DNA films,
indicating their potential for utilization as insulating dielectrics in capacitor applications. As a part of a baseline
study, results based on a comparison of the temperature-dependent dielectric behavior of DNA and DNA-CTMA
complex films as well as their frequency-dependent polarization behavior, are also discussed.
This paper reports on the use of new DNA-based biopolymers as the semiconducting layer in field effect transistors. Thin-film field effect transistor (FET) structures are fabricated with two different DNA-biopolymers as semiconductor layers, and two different field effect transistor structures are studied. Current voltage characteristics of the FETs show that the devices are operating in depletion mode.
Organic field-effect transistors (OFETs) currently utilize organic semiconductor materials with low electron
mobilities and organic gate oxide materials with low dielectric constants. Compared to inorganic FETs, OFETs have
slow operating speeds and high operating voltages. In this paper we discuss blending the conductive polymer
polyethylene dioxythiophene (PEDOT) with deoxyribonucleic acid (DNA), with minimal optimization to produce a
new bio-conductive polymer complex potentially suitable for OFETs. The conductivity of this new bio-conductive
polymer complex is tunable, ranging from 10-10 S/cm to 10-3 S/cm at room temperature.
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