Optical Studies of Sub-monolayer Dye Films for Photo-alignment of Liquid Crystal Cells

submitted by: icamvid

J. M. Dahdah talks about functionalized surfaces, their role in the development of nanostructures, their properties controlled by light, and their complex micro-structural environments.

Graphene field effect transistors with high on/off current ratio and large transport band gap at room temperature

submitted by: liting231
Graphene is considered to be a promising candidate for future nanoelectronics due to its exceptional electronic properties. Unfortunately, the graphene field-effect transistors (FETs) cannot be turned off effectively due to the absence of a band gap, leading to an on/off current ratio typically around 5 in top-gated graphene FETs. On the other hand, theoretical investigations and optical measurements suggest that a band gap up to a few hundred millielectronvolts can be created by the...
Authors: Fengnian Xia

Improved Synthesis of Graphene Oxide

submitted by: mikewilliams
An improved method for the preparation of graphene oxide (GO) is described. Currently, Hummers’ method (KMnO4, NaNO3, H2SO4) is the most common method used for preparing graphene oxide. We have found that excluding the NaNO3, increasing the amount of KMnO4, and performing the reaction in a 9:1 mixture of H2SO4/H3PO4 improves the efficiency of the oxidation process. This improved method provides a greater amount of hydrophilic oxidized graphene material as compared to Hummers’ method or...
Authors: Lawrence Alemany, Alexander Slesarev, Zhengzong Sun, Alexander Sinitskii, Jacob Berlin, Dmitry Kosynkin, Daniela Marcano, James Tour, Wei Lu