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Displaying 1026 - 1050 of 3718

Mobility overestimation due to gated contacts in organic field-effect transistors

March 10, 2016

Author(s)

Emily G. Bittle, David J. Gundlach, Oana Jurchescu, James I. Basham, Thomas Jackson

Parameters used to describe the electrical properties of organic field-effect transistors, such as mobility and threshold voltage, are commonly extracted from measured currentvoltage characteristics and interpreted by using the classical metal oxide

Phase Behavior of Poly(3-hexylthiophene-2,5-diyl)

March 8, 2016

Author(s)

Chad R. Snyder, Enrique Gomez

The phase behavior of many conjugated polymers is rich but not yet fully explored. Stiff chain conformations and planar ring-like structures can promote both crystalline and liquid crystalline phases. Recent computational efforts that rely on atomistic and

Real-time Photoluminescence Studies of Thin Film Formation in Organic Solar Cells

February 29, 2016

Author(s)

Sebastian Engmann, Felicia A. Bokel, Hyun W. Ro, Dean M. DeLongchamp, Lee J. Richter

We present a method to study the structural evolution of organic bulk-heterojunctions via real-time, in-situ, steady state photoluminescence (PL). In-situ PL, in combination with real-time transmission and reflection measurements, allowed us to

Interlaboratory study towards a climate-specific test: spectroscopic characterizations of EVA in glass/EVA/glass systems

February 23, 2016

Author(s)

Jae Hyun Kim, Christopher M. Stafford, Yadong Lyu, Li C. Yu, Chiao-Chi Lin, Tinh Nguyen, Xiaohong Gu

EVA as an encapsulant material is exposed to various UV irradiation, thermal cycles, and humidity conditions. Degradation of EVA can reduce not only power generation due to yellowing, but also a structural integrity of a PV module. In order to investigate

Measuring the 3D Shape of Organelles in Bone Marrow Stromal Cells During Culture on Nanofiber Scaffolds

February 17, 2016

Author(s)

Wojtek J. Tutak, Carl Simon Jr., Jyotsnendu J. Giri, Peter Bajcsy

Recent work has shown that osteoprogenitor cell culture on nanofiber scaffolds can promote differentiation. This response may be driven by changes in cell morphology caused by the 3D structure of nanofibers. Herein, we hypothesized that nanofiber effects

Coupling of isotropic and directional interactions and its effect on phase separation and self-assembly

February 16, 2016

Author(s)

Debra J. Audus, Francis W. Starr, Jack F. Douglas

The interactions of molecules and particles in solution often involve an interplay between isotropic and highly directional interactions that lead to a mutual coupling of phase separation and self-assembly. This situation arises, for example, in proteins

Design Optimization of Hybrid-Switch Soft-Switching Inverters using Multi-Scale Electro-Thermal Simulation

February 16, 2016

Author(s)

Jose M. Ortiz, Tam H. Duong, Allen R. Hefner Jr., Jih-Sheng Lai

A multi-scale electro-thermal simulation approach is presented to optimize the design of a hybrid switch soft-switching inverter using a library of dynamic electro-thermal component models parameterized in terms of electrical, structural and material

Facile and low-cost length sorting of single-wall carbon nanotubes by precipitation and applications for thin-film transistors

February 14, 2016

Author(s)

Jeffrey Fagan, Hui Gui, Chongwu Zhou, Bilu Liu, Haitian Chen, Ming Zheng

Semiconducting single-wall carbon nanotubes (SWCNTs) with long lengths are highly desirable for many applications such as thin film transistors and circuits. Previous reported length sorting techniques usually require sophisticated instrumentations and are

Non-volatile Memory Devices with Redox-active Diruthenium Molecular Compound

February 12, 2016

Author(s)

Sujitra J. Pookpanratana, Hao Zhu, Emily G. Bittle, Sean Natoli, Tong Ren, Curt A. Richter, Qiliang Li, Christina A. Hacker

Non-volatile Flash-based memory devices, which incorporate a novel redox-active diruthenium molecule, is demonstrated. The memory device is in a capacitor structure, metal/oxide/molecule/oxide/silicon, where the diruthenium molecule is covalently attached

Seeing through walls at the nanoscale: microwave microscopy of enclosed objects and processes in liquids

February 11, 2016

Author(s)

Alexander Tselev, Jeyavel Velmurugan, Anton Ievlev, Sergei Kalinin, Andrei Kolmakov

Noninvasive in situ nanoscale imaging in liquid environments is a current imperative in analysis of delicate bio-medical objects and electrochemical processes at reactive liquid-solid interfaces. Microwaves of a few gigahertz frequency offer photons of

Impact of Monovalent Counter-ions on the Conformation of Flexible Polyelectrolytes Having Different Molecular Architectures

February 10, 2016

Author(s)

Alexandros Chremos, Jack F. Douglas

We explore the condensation of monovalent counter-ions on the molecular conformation of highly charged flexible polyelectrolytes for a range of molecular topologies (linear chains, stars, and unknotted and trefoil rings) by molecular dynamics simulations

Impact of and correction for instrument sensitivity drift on nanoparticle size measurements by single-particle ICP-MS

February 8, 2016

Author(s)

Hind El Hadri, Elijah Petersen, Michael R. Winchester

Engineered nanomaterials (ENMs) are already incorporated into numerous consumer products, and increasing product applications are expected in future years. To enable an understanding of potential risks associated with these products, it is important to

Super Stiff and Highly Transparent Multilayer Thin Films Prepared through Hydrogen-Bonding Layer- by-Layer Assembly of Graphene and Polymer

February 8, 2016

Author(s)

Fangming Xiang, Dorsa Parviz, Tara M. Givens, Ping Tzeng, Eric Davis, Christopher Stafford, Micah J. Green, Jaime C. Grunlan

Since its discovery in 2004, graphene has been intensely studied due to its high elastic modulus, thermal conductivity, electrical conductivity, and gas impermeability. Although it is possible to use small quantities of graphene sheets for fundamental

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