News: Research Highlight

SKPM scanning schematic

How static charge affects organic transistor switching voltages

June 9, 2014

A sideways transistor geometry correlated static charge quantitatively to changes in threshold voltage (VT) without disturbing transistor materials or interfaces, and also showed striking differences among different polymer gate materials. This will indicate more effective gate insulator choices for printed transistors with stabilized, defined VT, and inspire new material structures for other applications.

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The FRET signatures of noninteracting proteins in membranes

March 18, 2014

Förster resonance energy transfer (FRET) experiments are often used to study interactions between integral membrane proteins in cellular membranes. However, in addition to the FRET of sequence-specific interactions, these experiments invariably record a contribution due to proximity FRET, which occurs when a donor and an acceptor approach each other by chance within distances of ∼100 Å.

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toroidal structures

Toroidal structures from brush amphiphiles

December 5, 2013

The self-assembly of amphiphilic block copolymers has been widely studied as an approach for engineering nano-objects. A variety of different features, including spherical micelles, cylindrical or worm-like micelles, toroids, and vesicles result from the self assembly of linear amphiphilic block copolymers by manipulating the ratio of dissimilar blocks, solvent quality, and coronal interactions.

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Diverse organic field effect transistor sensor responses

September 26, 2013

Naphthalenetetracarboxylic diimide derivatives (octyl “8” NTCDI, dimethylaminopropyl “DMP” NTCDI), and copper phthalocyanine (CuPc) were used to form a diverse organic field-effect transistor (OFET) sensor array. CuPc and 8-NTCDI are p-channel and n-channel semiconductors respectively, showing expected and opposing responses to analytes. DMP-NTCDI, on the other hand, because of its ionizable side chain, shows response directions […]

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