Complementary Semiconducting Polymer Blends for Efficient Charge Transport

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b03349

Yan Zhao, Xikang Zhao, Michael Roders, Ge Qu, Ying Diao, Alexander L. Ayzner and Jianguo Mei
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Copolymerization of Polythiophene and Sulfur To Improve the Electrochemical Performance in Lithium–Sulfur Batteries

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b02317

Bernd Oschmann, Jungjin Park, Chunjoong Kim, Kookheon Char, Yung-Eun Sung and Rudolf Zentel
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Highly Stretchable and Conductive Core–Sheath Chemical Vapor Deposition Graphene Fibers and Their Applications in Safe Strain Sensors

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b02098

Xiaona Wang, Yunfeng Qiu, Wenwu Cao and PingAn Hu
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Impact of Film Thickness and Temperature on Ultrafast Excess Charge Dynamics in Ionic Liquid Films

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b07262

Alex J. Shearer, David E. Suich, Benjamin W. Caplins and Charles B. Harris
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Fluorinated Reduced Graphene Oxide as an Interlayer in Li–S Batteries

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b02906

Alen Vizintin, Matic Lozinšek, Rajesh Kumar Chellappan, Dominique Foix, Andraz Krajnc, Gregor Mali, Goran Drazic, Bostjan Genorio, Rémi Dedryvère and Robert Dominko
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Chemical Synthesis and Characterization of γ-Co2NiGa Nanoparticles with a Very High Curie Temperature

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b02227

Changhai Wang, Aleksandr A. Levin, Lucia Nasi, Simone Fabbrici, Jinfeng Qian, Carlos E. Viol Barbosa, Siham Ouardi, Julie Karel, Franca Albertini, Borrmann Horst, Gerhard H. Fecher and Claudia Felser
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Elemental Anisotropic Growth and Atomic-Scale Structure of Shape-Controlled Octahedral Pt–Ni–Co Alloy Nanocatalysts

Nano Letters

DOI: 10.1021/acs.nanolett.5b03057

Rosa M. Arán-Ais, Fabio Dionigi, Thomas Merzdorf, Martin Gocyla, Marc Heggen, Rafal E. Dunin-Borkowski, Manuel Gliech, José Solla-Gullón, Enrique Herrero, Juan M. Feliu and Peter Strasser
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Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce21H46O18–Y (Si/Al = 1.69) Containing Ce4O44+, CeOH2+, Ce3+, and H+

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b08373

Cheol Woong Kim, Ho-Cheol Kang, Nam Ho Heo and Karl Seff
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Nanodiamond–Gutta Percha Composite Biomaterials for Root Canal Therapy

ACS Nano

DOI: 10.1021/acsnano.5b05718

Dong-Keun Lee, Sue Vin Kim, Adelheid Nerisa Limansubroto, Albert Yen, Akrivoula Soundia, Cun-Yu Wang, Wenyuan Shi, Christine Hong, Sotirios Tetradis, Yong Kim, No-Hee Park, Mo K. Kang and Dean Ho
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EPR Study of Structural Phase Transition in Manganese-Doped [(CH3)2NH2][Zn(HCOO)3] Metal–Organic Framework

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b08680

Mantas Šimėnas, Aneta Ciupa, Mirosław Ma̧czka, Andreas Pöppl and Ju̅ras Banys
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Rate Dependent Performance Related to Crystal Structure Evolution of Na0.67Mn0.8Mg0.2O2 in a Sodium-Ion Battery

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b02142

Neeraj Sharma, Nuria Tapia-Ruiz, Gurpreet Singh, A. Robert Armstrong, James C. Pramudita, Helen E. A. Brand, Juliette Billaud, Peter G. Bruce and Teofilo Rojo
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Numerical and Experimental Analyses on Deviated Concentration Loss with Alkaline Anion-Exchange Membrane Fuel Cells

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b08031

Sikan Peng, Jian Gong, Xin Xu, Pang-Chieh Sui, Shanfu Lu and Yan Xiang
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Photocurrent Response in Multiwalled Carbon Nanotube Core–Molybdenum Disulfide Shell Heterostructures

The Journal of Physical Chemistry C

DOI: 10.1021/acs.jpcc.5b06609

Lili Gong, Liangjun Wang, Junpeng Lu, Cheng Han, Wei Chen and Chorng Haur Sow
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Topochemical Solid-State Reactivity: Redox-Induced Direct Structural Transformation from CuSe2 to CuInSe2

Chemistry of Materials

DOI: 10.1021/acs.chemmater.5b03630

Alan Olvera, Pranati Sahoo, Stephanie Tarczynski and Pierre F.P. Poudeu
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Improved quantum dot stacking for intermediate band solar cells using strain compensation

We use thin tensile-strained AlAs layers to manage compressive strain in stacked layers of InAs/AlAsSb quantum dots (QDs). The AlAs layers allow us to reduce residual strain in the QD stacks, suppressing strain-related defects. AlAs layers 2.4 monolayers thick are sufficient to balance the strain in the structures studied, in agreement with theory. Strain balancing improves material quality and helps increase QD uniformity by preventing strain accumulation and ensuring that each layer of InAs experiences the same strain. Stacks of 30 layers of strain-balanced QDs exhibit carrier lifetimes as long as 9.7 ns. QD uniformity is further enhanced by vertical ABAB … ordering of the dots in successive layers. Strain compensated InAs/AlAsSb QD stacks show great promise for intermediate band solar cell applications.

Paul J Simmonds, Meng Sun, Ramesh Babu Laghumavarapu, Baolai Liang, Andrew G Norman, Jun-Wei Luo and Diana L Huffaker

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Effects of chemical fuel composition on energy generation from thermopower waves

Thermopower waves, which occur during combustion within hybrid structures formed from nanomaterials and chemical fuels, result in a self-propagating thermal reaction and concomitantly generate electrical energy from the acceleration of charge carriers along the nanostructures. The hybrid structures for thermopower waves are composed of two primary components: the core thermoelectric material and the combustible fuel. So far, most studies have focused on investigating various nanomaterials for improving energy generation. Herein, we report that the composition of the chemical fuel used has a significant effect on the power generated by thermopower waves. Hybrid nanostructures consisting of mixtures of picric acid and picramide with sodium azide were synthesized and used to generate thermopower waves. A maximum voltage of ∼2 V and an average peak specific power as high as 15 kW kg −1 were obtained using the picric acid/sodium azide/multiwalled carbon nanotubes (MWCNTs) ar...

Taehan Yeo, Hayoung Hwang, Dong-Cheol Jeong, Kang Yeol Lee, Jongsup Hong, Changsik Song and Wonjoon Choi

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The effect of silver thickness on the enhancement of polymer based SERS substrates

We investigated silver-covered polymer based nanogratings as substrates for surface-enhanced Raman spectroscopy (SERS), in particular with respect to the thickness of the plasmonically active silver film. In order to obtain accurate geometrical input data for the simulation process, we inspected cross sections of the gratings prepared by breaking at cryogenic temperature. We noticed a strong dependence of the simulation results on geometrical variations of the structures. Measurements revealed that an increasing silver film thickness on top of the nanogratings leads to a blue shift of the plasmonic resonance, as predicted by numerical simulations, as well as to an increased field enhancement for an excitation at 488 nm. We found a clear deviation of the experimental data compared to the simulated results for very thin silver films due to an island-like growth at a silver thickness below 20 nm. In order to investigate the SERS activity. we carried out measurements with crystal vio...

H Schneidewind, K Weber, M Zeisberger, U Hübner, A Dellith, D Cialla-May, R Mattheis and J Popp

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Vertically aligned cobalt oxide nanowires on graphene networks for high-performance lithium storage

Despite various electrochemically active materials, such as metals, metal oxides and sulfides, which have been widely utilized for lithium storage, these materials still encounter unsatisfied electrochemical performances including low reversible capacity, slow charge-discharge capability and poor cycle performance. Here, we demonstrate a simple approach to fabricate one-dimensional CoO nanowires vertically aligned on a 3D graphene network (denoted as a 3D CoO/graphene network) via a wet chemistry process. The resulting CoO/graphene network possesses an interconnected graphene network, hierarchical pores and a carpet-like structure. This unique network can (1) facilitate the easy access of the electrolyte, (2) prevent the aggregation of CoO nanowires, (3) accommodate the volume change of CoO during the cycle processes, (4) maintain a high electrical conductivity for the overall electrode and (5) give rise to a high content of CoO in the composite (∼92 wt%). As a result, the 3D CoO...

Liujun Cao, Lulu Ma, Peng Xiao, Yunhuai Zhang, Shengtao Zhang and Shubin Yang

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Catalyst and doping methods for arc graphene

Nitrogen-doped graphene synthesis with ∼g scale has been accomplished using the arc discharge method. The defects formed in the synthesis process were reduced by adding various metal catalysts, among which Bi 2 O 3 was found to be the most effective. Adding dopants to the starting materials increased the electrical conductivity of the graphene product, and the doping concentration in graphene was tuned by adjusting the amount of nitrogen dopants. A step-wise technique to fabricate graphene thin films was developed, including dispersion, separation, and filtering processes. The arc graphene can also find its potential application in supercapacitors, taking advantage of its large surface area and improved conductivity by doping.

Hyunjin Cho, InSeoup Oh, JungHo Kang, Sungchan Park, Boncheol Ku, Min Park, Soonjong Kwak, Partha Khanra, Joong Hee Lee and Myung Jong Kim

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Dynamic study on the transformation process of gold nanoclusters

In this paper, the transformation process from Au 8 to Au 25 nanoclusters (NCs) is investigated with steady state fluorescence spectroscopy and time-resolved fluorescence spectroscopy at various reaction temperatures and solvent diffusivities. Results demonstrate that Au 8 NCs, protected by bovine serum albumin, transform into Au 25 NCs under controlled pH values through an endothermic reaction with the activation energy of 74 kJ mol −1 . Meanwhile, the characteristic s-shaped curves describing the formation of Au 25 NCs suggest this process involves a diffusion controlled growth mechanism.

Xiaoqian Ma, Xiaoming Wen, Yon-Rui Toh, Kuo-Yen Huang, Jau Tang and Pyng Yu

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