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