2 research outputs found

    Mechanism of Label-Free DNA Detection Using the Floating Electrode on Pentacene Thin Film Transistor

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    The analysis of DNA in the posthuman genome project era has become an ever-expanding branch of research and is thus routinely employed in the majority of biochemical laboratories. This work discusses the mechanism and label-free detection of DNA using a pentacene thin film transistor with a gold floating electrode on the active layer. Thiolated polynucleotide probes were used, which form self-aligned monolayers on the floating electrode over the pentacene active layer. The immobilization of the DNA on floating electrode increased the work function and raised the Schottky barrier of the device, resulting in a charge screening effect. Hence, the negative charge of the DNA caused a positive shift in the threshold voltage of the transistor. Based on the change in the electrical output, synthesized DNA and the viral DNA were detected

    Laminated Graphene Films for Flexible Transparent Thin Film Encapsulation

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    We introduce a simple, inexpensive, and large-area flexible transparent lamination encapsulation method that uses graphene films with polydimethylsiloxane (PDMS) buffer on polyethylene terephthalate (PET) substrate. The number of stacked graphene layers (<i>n</i><sub>G</sub>) was increased from 2 to 6, and 6-layered graphene-encapsulation showed high impermeability to moisture and air. The graphene-encapsulated polymer light emitting diodes (PLEDs) had stable operating characteristics, and the operational lifetime of encapsulated PLEDs increased as <i>n</i><sub>G</sub> increased. Calcium oxidation test data confirmed the improved impermeability of graphene-encapsulation with increased <i>n</i><sub>G</sub>. As a practical application, we demonstrated large-area flexible organic light emitting diodes (FOLEDs) and transparent FOLEDs that were encapsulated by our polymer/graphene encapsulant
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