Now showing items 1-10 of 294
Thickness dependence, in situ measurements, and morphology of thermally controlled interdiffusion in polymer-C-60 photovoltaic devices
(American Physical Society, 2004-04-28)
A series of detailed studies is presented in which heat-induced interdiffusion is used to create a gradient bulk-heterojunction of 2-methoxy-5-(2(')-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) copolymer and C-60. Starting ...
Millisecond switching in solid state electrochromic polymer devices fabricated from ionic self-assembled multilayers
(AIP Publishing, 2008-01-01)
The electrochromic switching times of solid state conducting polymer devices fabricated by the ionic self-assembled multilayer method has been investigated. The devices were composed of bilayers of poly(3,4-ethylenedioxy ...
Infrared activity in the Aurivillius layered ferroelectric SrBi2Ta2O9
(American Physical Society, 1998-03-01)
Experimental studies were carried out on infrared-active phonons in the Aurivillius ferroelectric SrBi2Ta2O9 (SBT), using reflectivity measurements (down to 200 cm(-1)) and transmission measurements (down to 100 cm(-1)) ...
Evidence of decoupled lattice distortion and ferroelectric polarization in the relaxor system PMN-xPT
(American Physical Society, 2003-12-30)
We report high q-resolution neutron scattering data on PMN-xPT single crystals with x=20% and 27%. No rhombohedral distortion occurs in the 20PT sample for temperatures as low as 50 K. On the other hand, the 27PT sample ...
Synthesis kinetics of CdSe quantum dots in trioctylphosphine oxide and in stearic acid
(AIP Publishing, 2005-04-01)
A diffusion-barrier model described the early evolution of size-dependent photoluminescence emission from CdSe quantum dots formed by organometallic synthesis. Emission peak widths, emission redshift rates, and nanocrystal ...
Heat conductivity of the DNA double helix
(American Physical Society, 2011-06-20)
Thermal conductivity of isolated single molecule DNA fragments is of importance for nanotechnology, but has not yet been measured experimentally. Theoretical estimates based on simplified (1D) models predict anomalously ...
Ion transport and storage of ionic liquids in ionic polymer conductor network composites
(AIP Publishing, 2010-05-01)
We investigate ion transport and storage of ionic liquids in ionic polymer conductor network composite electroactive devices. Specifically, we show that by combining the time domain electric and electromechanical responses, ...
First-principles study of several hypothetical silica framework structures
(American Physical Society, 1995-09-15)
Several hypothetical silica structures have been generated using a simulated-annealing strategy with an ab initio based covalent-bonding potential. First-principles total-energy pseudopotential methods have been used to ...
Layer-by-layer self-assembled conductor network composites in ionic polymer metal composite actuators with high strain response
(AIP Publishing, 2009-07-01)
We investigate the electromechanical response of conductor network composite (CNC) fabricated by the layer-by-layer (LbL) self-assembly method. The process makes it possible for CNCs to be fabricated at submicron thickness ...
Transient pulses from exploding primordial black holes as a signature of an extra dimension
(Iop Publishing Ltd, 2008-11-01)