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Search Publications

NIST Authors in Bold

Displaying 1226 - 1250 of 2294

Film morphology evolution during solvent vapor annealing of highly efficient small molecule donor/acceptor blends

September 15, 2016
Author(s)
Sebastian Engmann, Hyun W. Ro, Andrew Herzing, Chad R. Snyder, Lee J. Richter, Paul Geraghty, David Jones
Solution-processable small molecule photovoltaics based on the novel molecular donor, benzodithiophene terthiophene rhodamine (BTR), recently have shown maximum power conversion efficiencies above 8% for active layer thicknesses up to 400 nm, using post

Thermodynamics of Cottrell atmospheres tested by atomistic simulations

September 15, 2016
Author(s)
Yuri Mishin, John W. Cahn
Solute atoms can segregate to elastically deformed lattice regions around a dislocation and form an equilibrium distribution called the Cottrell atmosphere. We compare two approaches to describe Cottrell atmospheres. In the Eshelby theory, the solid

Three-Dimensional Protonic Conductivity in Porous Organic Cage Solids

September 13, 2016
Author(s)
Ming Liu, Linjiang Chen, Scott Lewis, Samantha Y. Chong, Marc A. Little, Tom Hasell, Iain M. Aldous, Craig Brown, Martin W. Smith, Carole A. Morrison, Laurence J. Hardwick, Andrew I. Cooper
Proton conduction is a fundamental process in biology and in devices such as proton exchange membrane fuel cells. To maximize proton conduction, 3-D conduction pathways are preferred over 1-D pathways, which prevent proton conduction in two-dimensions

Conformational Nature of DNAGrafted Chains on Spherical Gold Nanoparticles

September 10, 2016
Author(s)
Jack F. Douglas, Fernando Vargas-Lara
We investigate the conformational state of a simple, coarse–grained molecular model for single–stranded DNA chains (ss-DNA) grafted onto spherical symmetric gold nanoparticles (NPs) and of the grafted layer as a whole by molecular dynamic simulations. In

Structural and Dynamical Trends in Alkali-Metal Silanides Characterized by Neutron-Scattering Methods

September 2, 2016
Author(s)
Wan Si NMN Tang, Mirjana NMN Dimitrievska, Jean-Noel Chotard, Wei Zhou, Raphael Janot, Alexander V. Skripov, Terrence J. Udovic
Structural, vibrational, and dynamical properties of the mono- and mixed-alkali silanides (MSiH 3, where M=K, Rb, Cs, K 0.5Rb 0.5Cs 0.5, and Rb 0.5Cs 0.5) were investigated by various neutron experiments, including neutron powder diffraction (NPD), neutron

Stabilizing Superionic-Conducting Structures via Mixed-Anion Solid Solutions of Monocarba-Closo-Borate Salts

September 1, 2016
Author(s)
Wan Si NMN Tang, Koji Yoshida, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Alexander V. Skripov, Mirjana NMN Dimitrievska, Vitalie Stavila, Shin-Ichi Orimo, Terrence J. Udovic
Solid lithium and sodium closo-polyborate-based salts are capable of superionic conductivities surpassing even liquid electrolytes, but often only at above-ambient temperatures where their entropically driven disordered phases become stabilized. Here we

Ultraviolet photodetectors based on transition metal oxides

September 1, 2016
Author(s)
Ratan K. Debnath, Albert Davydov
Ultraviolet (UV) photodetector (PD) has attracted extensive attention owing to their broad application in digital imaging, missile plume detection, optical communications, and biomedical sensing. Conventional Si based UV PD requires costly high pass

Modulated Magnetism and Anomalous Electronic Transport in Ce 3 Cu 4 As 4 O 2

August 29, 2016
Author(s)
Jiakui K. Wang, Shan Wu, Yiming Qiu, Jose Rodriguez Rivera, Qingzhen Huang, Collin L. Broholm, E. Morosan
The complex magnetism and transport properties of tetragonal Ce 3Cu 4As 4O 2 were examined through neutron scattering and physical properties measurements on polycrystalline samples. The lamellar structure consists of alternating layers of CeCu 4As 4 with

Windowless CdSe/CdTe Solar Cells with Differentiated Back Contacts: J-V, EQE and Photocurrent Mapping

August 26, 2016
Author(s)
Daniel Josell, Ratan K. Debnath, Jong Yoon Ha, Jonathan E. Guyer, Nhan V. Nguyen, M. A. Sahiner, C Reehil, W. A. Manners
This paper presents a study of windowless CdSe/CdTe thin film photovoltaic devices with in-plane patterning at a submicrometer length scale. The photovoltaic cells are fabricated upon two interdigitated comb electrodes pre-patterned at micrometer length

Artifacts in magnetic measurements of fluid samples

August 24, 2016
Author(s)
Cindi L. Dennis, Zoe A. Boekelheide
Applications of magnetic fluids are ever increasing, as well as the corresponding need to be able to characterize these fluids in situ. Commercial magnetometers are accurate and well-characterized for solid and powder samples, but their use with fluid

Effect of Grain Constraint on the Field Requirements for Magnetocaloric Effect in Ni(sub45)Co(Sub5)Mn(Sub40)Sn(sub10) Melt-Spun Ribbons

August 21, 2016
Author(s)
N. M. Bruno, Y. J. Huang, Cindi L. Dennis, J. G. Li, Robert D. Shull, J. H. Ross Jr., Y. I. Chumlyakov, I. Karaman
The influence of grain constraint on the magnetic field levels required to complete the isothermal martensitic transformation in magnetic shape memory alloys has been demonstrated for a NiCoMnSn alloy and the magnetocaloric performance of an optimally heat

Structure-Dependent Vibrational Dynamics in Mg(BH 4 ) 2 Polymorphs Probed with Neutron Vibrational Spectroscopy and First-Principles Calculations

August 19, 2016
Author(s)
Mirjana NMN Dimitrievska, James L. White, Wei Zhou, Vitalie Stavila, Leonard E. Klebanoff, Terrence J. Udovic
The structure-dependent vibrational properties of different Mg(BH 4)d2^ polymorphs (α, β, γ and δ phases) were investigated with a combination of neutron vibrational spectroscopy measurements and density functional theory (DFT) calculations, with emphasis

Diffusion in FCC Co-Al-W Alloys at 900 degree C and 1000 degree C

August 17, 2016
Author(s)
Kil-Won Moon, Carelyn E. Campbell, Maureen E. Williams, William J. Boettinger
Diffusion couple experiments between various Co-rich face centered cubic alloys in the Co-W-Al ternary system have been conducted at 900 degree C and 1000 degree C. Diffusion coefficients have been extracted for the Co-W binary and for ternary alloys at

Magnetic Random Access Memory

August 5, 2016
Author(s)
Michael L. Schneider, P. G. Mather
Magnetic Random Access Memory (MRAM) possesses a unique combination of attributes that provide considerable benefits over those available with conventional memory technology. Here we discuss the state-of-the-art of MRAM, from parts currently in production

An Antimony Selenide Molecular Ink for Flexible Broadband Photodetectors

August 3, 2016
Author(s)
Ratan K. Debnath, MD R. Hasan, Arunima Singh, Vladimir P. Oleshko, Shiqi Guo, Asha Rani, Abhishek Motayed, Nhan V. Nguyen, Albert Davydov
The need for low-cost high-performance broadband photon detection with sensitivity in the near infrared (NIR) has driven interest in new materials that combine high absorption with traditional electronic infrastructure (CMOS) compatibility. Here, we

Eu 3+ -Doped Wide Band Gap Zn 2 SnO 4 Semiconductor Nanoparticles: Structure and Luminescence

August 3, 2016
Author(s)
Mirjana NMN Dimitrievska, Tamara B. Ivetic, Alexander P. Litvinchuk, Andrew Fairbrother, Bojan B. Miljevic, Goran R. Strbac, Alejandro Perez-Rodriguez, Svetlana R. Lukic-Petrovic
Nanocrystalline Zn 2SnO 4powders doped with Eu 3+ ions were synthesized via a mechanochemical solid-state reaction method followed by post annealing in air at 1200 °C. X-ray diffraction (XRD), energy-dispersive X-ray (EDX), Raman and photoluminescence (PL)

Reversible adsorption kinetics of near surface dimer colloids

August 2, 2016
Author(s)
Paul NMN Salipante, Steven D Hudson
We investigate the effect of shape on reversible adsorption kinetics using colloidal polystyrene dimers near a solid glass surface as a model system. The interaction between colloid and wall is tuned using electrostatic, depletion, and gravity forces to

Charge Carrier Dynamics and Mobility Determined by Time-Resolved Terahertz Spectroscopy on Films of Nano-to-Micrometer-Sized Colloidal Tin(II) Monosulfide

August 1, 2016
Author(s)
Brian Alberding, Adam Biacchi, Angela R. Hight Walker, Edwin J. Heilweil
Tin(II) monosulfide (SnS) is a semiconductor material with an intermediate band gap, high absorption coefficient is the visible range, and consists of earth abundant, non-toxic elements. For these reasons, SnS has generated much interest for incorporation
Displaying 1226 - 1250 of 2294
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