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Synthesis and Self-assembly of a DNA-conjugated Poly(propylene glycol) Derivative
Soong Ho Um 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.6
Due to several characteristic features of DNA (e.g., genetic coding transfer and nanoscaled accuracy or so), DNA based compounds have been recently highlighted in a variety of research fields, including physics, chemistry, engineering or so. To date, they have been expanded into a hybrid form conjugated with conventional polymer groups. Such synthetic hybrid conjugates can be organized into multi-dimensional nanoor micro-structures; rod, sheet, and spherical shaped nanomaterials [1]. In this study, we showed a novel block copolymer composed of DNA and poly(propylene glycol)(PPG) (designated as DNA-b-PPG) for the self-assembled construction into three-dimensional vesicular structures.
Water-Gel for Gating Graphene Transistors
Kim, Beom Joon,Um, Soong Ho,Song, Woo Chul,Kim, Yong Ho,Kang, Moon Sung,Cho, Jeong Ho American Chemical Society 2014 NANO LETTERS Vol.14 No.5
<P>Water, the primary electrolyte in biology, attracts significant interest as an electrolyte-type dielectric material for transistors compatible with biological systems. Unfortunately, the fluidic nature and low ionic conductivity of water prevents its practical usage in such applications. Here, we describe the development of a solid state, megahertz-operating, water-based gate dielectric system for operating graphene transistors. The new electrolyte systems were prepared by dissolving metal-substituted DNA polyelectrolytes into water. The addition of these biocompatible polyelectrolytes induced hydrogelation to provide solid-state integrity to the system. They also enhanced the ionic conductivities of the electrolytes, which in turn led to the quick formation of an electric double layer at the graphene/electrolyte interface that is beneficial for modulating currents in graphene transistors at high frequencies. At the optimized conditions, the Na-DNA water-gel-gated flexible transistors and inverters were operated at frequencies above 1 MHz and 100 kHz, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-5/nl500446s/production/images/medium/nl-2014-00446s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl500446s'>ACS Electronic Supporting Info</A></P>