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8 Oct 2012

Volume 101, Issue 15, Articles (15xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 153501 (2012); http://dx.doi.org/10.1063/1.4756693 (3 pages)

Brandon G. Cook, William R. French, and Kálmán Varga
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Hole mobility characterization of DNA biopolymer by time-of-flight technique

Ting-Yu Lin, I-Ching Chen, and Yu-Chueh Hung

Appl. Phys. Lett. 101, 153701 (2012); http://dx.doi.org/10.1063/1.4758477 (3 pages)

Online Publication Date: 8 October 2012

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In this study, the hole mobility of DNA biopolymer is examined by time-of-flight measurement. DNA biopolymer film is characterized under different electric fields and temperatures. The hole mobility exhibits a negative field dependence at lower fields above 273 K and is found to be positively correlated with temperature. Analysis of the experimental results is carried out and the carrier transport mechanisms in DNA biopolymer based on the experimental results are proposed and discussed.
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73.61.Ph Polymers; organic compounds
73.50.Dn Low-field transport and mobility; piezoresistance
72.20.Fr Low-field transport and mobility; piezoresistance

Modified processing techniques of a DNA biopolymer for enhanced performance in photonics applications

Fahima Ouchen, Gregory A. Sotzing, Trisha L. Miller, Kristi M. Singh, Brian A. Telek, Alyssa C. Lesko, Roberto Aga, Emily M. Fehrman-Cory, Perry P. Yaney, James G. Grote, Carrie M. Bartsch, and Emily M. Heckman

Appl. Phys. Lett. 101, 153702 (2012); http://dx.doi.org/10.1063/1.4758484 (3 pages)

Online Publication Date: 9 October 2012

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Significant modifications have been made in the processing techniques developed to transform purified, marine-based deoxyribonucleic acid (DNA) into a biopolymer suitable for optical and electronic device fabrication. This technique employs a modified soxhlet-dialysis rinsing process to completely remove excess ionic contaminants from the DNA biopolymer, resulting in a material with greater mechanical stability and enhanced performance reproducibility.
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85.65.+h Molecular electronic devices
82.39.Pj Nucleic acids, DNA and RNA bases
82.35.Pq Biopolymers, biopolymerization
82.37.Rs Single molecule manipulation of proteins and other biological molecules
87.15.-v Biomolecules: structure and physical properties
87.14.gk DNA

Influence of dissolved air on the adsorption properties and stability of vesicles on various surfaces

Hyejung Seo, Wooree Ko, and Sangmin Jeon

Appl. Phys. Lett. 101, 153703 (2012); http://dx.doi.org/10.1063/1.4758487 (3 pages)

Online Publication Date: 9 October 2012

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Large unilamellar vesicles were prepared for adsorption on quartz crystal surfaces coated with gold, mercaptoundecanoic acid, or octadecanethiol self-assembled monolayers. The adsorption of the vesicles onto these surfaces decreases the resonance frequency of the quartz crystals. We found that frequency changes due to vesicle adsorption were much lower in degassed than in air-rich water. Further, the vesicles adsorbed in air-rich water desorbed when the medium was replaced with degassed water, indicating that the presence of dissolved air in water played a key role in the adsorption and stability of vesicles.
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87.16.dr Assembly and interactions
87.15.N- Properties of solutions of macromolecules
68.43.Mn Adsorption kinetics
68.47.Pe Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces
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