Nature Materials contents: February 2015 Volume 14 Number 2 pp 133-244

If you are unable to see the message below, click here to view.

TABLE OF CONTENTS February 2015 Volume 14, Issue 2 Editorial Research Highlights News and Views Review Letters Articles Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement July 20-22, 2015, Aveiro, Portugal, Europe  (6th International conference on Advanced Nanomaterials, 1st international conference on Graphene Technology & 1st international conference on Hydrogen Energy) The supporting journals of ANM2015 are: Journal of Applied Physics, International Journal of Hydrogen Energy, Materials Today: Proceedings and Nanomedicine.   Editorial Top Introducing editorial changes   p133 doi:10.1038/nmat4212 This year we will offer the option of double-blind peer review and introduce a reproducibility checklist for life sciences articles that helps authors adhere to data-reporting standards. Research Highlights Top Spin transistors: Going electric | Graphene: Supersonic impact | Flexible electronics: All-organic image detectors | Amyloid self-assembly: Dimer detection | DNA origami: Slider and hinge joints News and Views Top Quantum spintronics: Single spins in silicon carbide   pp135 - 136 Andrea Morello doi:10.1038/nmat4171 Individual spins, associated with vacancies in the silicon carbide lattice, have been observed and coherently manipulated. This may offer new directions for integrated spintronic devices. See also: Letter by Christle et al. | Letter by Widmann et al. Thermal transport: Cool electronics   pp136 - 137 Jungwan Cho & Kenneth E. Goodson doi:10.1038/nmat4194 Although heat removal in electronics at room temperature is typically governed by a hierarchy of conduction and convection phenomena, heat dissipation in cryogenic electronics can face a fundamental limit analogous to that of black-body emission of electromagnetic radiation. See also: Letter by Schleeh et al. Ferroelectrics: Negative capacitance detected   pp137 - 139 Gustau Catalan, David Jiménez & Alexei Gruverman doi:10.1038/nmat4195 The experimental detection of negative capacitance in ferroelectrics rekindles hopes that the phenomenon could be used to further push the miniaturization of conventional transistors. See also: Letter by Khan et al. Material witness: Holding Rome together   p139 Philip Ball doi:10.1038/nmat4197 Perovskite solar cells: Switchable photovoltaics   pp140 - 141 Nam-Gyu Park doi:10.1038/nmat4177 The migration of ions under the effect of an external electric field locally modifies the doping of organometal halide perovskite films. This is used to reversibly switch the photocurrent direction in very simple photovoltaic architectures. See also: Letter by Xiao et al. Nature Materials JOBS of the week Postdoctoral Position in Nanophotonics and 2D materials Argonne National Laboratory Magnetic Properties of Molecular Magnets and Photomagnetism Sino-British Materials Research Institute PhD Positions: NMR Study of Nano-Silica Supported Catalysts University of Lille 1 3.5 years PhD studentship University College London (UCL) Five Junior Research Group Leader Positions Leibniz Research Cluster (LRC) More Science jobs from Nature Materials EVENT Soft Interfacial Materials: from Fundamentals to Formulation 12.10.15 London, UK More science events from Review Top Smart hybrid materials by conjugation of responsive polymers to biomacromolecules   pp143 - 159 Isidro Cobo, Ming Li, Brent S. Sumérlin & Sebastien Perrier doi:10.1038/nmat4106 The properties and applications of biomacromolecules, for example proteins, can be enhanced by the covalent attachment of synthetic polymers. This Review discusses the modification of these biomacromolecules with stimuli-responsive polymers. Letters Top Isolated electron spins in silicon carbide with millisecond coherence times   pp160 - 163 David J. Christle, Abram L. Falk, Paolo Andrich, Paul V. Klimov, Jawad Ul Hassan, Nguyen T. Son, Erik Janzén, Takeshi Ohshima & David D. Awschalom doi:10.1038/nmat4144 Optically detected magnetic resonance experiments show that single spins having a coherence time on the millisecond scale can be isolated in divacancy defects in silicon carbide at low temperature. See also: Letter by Widmann et al. | News and Views by Morello Coherent control of single spins in silicon carbide at room temperature   pp164 - 168 Matthias Widmann, Sang-Yun Lee, Torsten Rendler, Nguyen Tien Son, Helmut Fedder, Seoyoung Paik, Li-Ping Yang, Nan Zhao, Sen Yang, Ian Booker, Andrej Denisenko, Mohammad Jamali, S. Ali Momenzadeh, Ilja Gerhardt, Takeshi Ohshima, Adam Gali, Erik Janzén & Jörg Wrachtrup doi:10.1038/nmat4145 Defects in silicon carbide have recently been proposed as bright single-photon sources. It is now shown that they can be used as sources of single electron spins having long coherence times at room temperature. See also: Letter by Christle et al. | News and Views by Morello Synthesis of an open-framework allotrope of silicon   pp169 - 173 Duck Young Kim, Stevce Stefanoski, Oleksandr O. Kurakevych & Timothy A. Strobel doi:10.1038/nmat4140 A new orthorhombic allotrope of silicon, Si24, is demonstrated using a two-step synthesis. Its structure contains open channels and it possesses a quasidirect bandgap near 1.3 eV. Magneto-ionic control of interfacial magnetism   pp174 - 181 Uwe Bauer, Lide Yao, Aik Jun Tan, Parnika Agrawal, Satoru Emori, Harry L. Tuller, Sebastiaan van Dijken & Geoffrey S. D. Beach doi:10.1038/nmat4134 An applied voltage is shown to reversibly alter the magnetic anisotropy of an ultrathin Co film deposited on a GdOx dielectric layer, by switching the interfacial oxidation state. Negative capacitance in a ferroelectric capacitor   pp182 - 186 Asif Islam Khan, Korok Chatterjee, Brian Wang, Steven Drapcho, Long You, Claudy Serrao, Saidur Rahman Bakaul, Ramamoorthy Ramesh & Sayeef Salahuddin doi:10.1038/nmat4148 Direct measurement of negative capacitance is now reported in a ferroelectric capacitor based on a thin, epitaxial ferroelectric PZT film. See also: News and Views by Catalan et al. Phonon black-body radiation limit for heat dissipation in electronics   pp187 - 192 J. Schleeh, J. Mateos, I. Íñiguez-de-la-Torre, N. Wadefalk, P. A. Nilsson, J. Grahn & A. J. Minnich doi:10.1038/nmat4126 Thermal resistance at room temperature is mostly due to scattering by defects and interfaces. Now, heat dissipation in cryogenic electronic devices is demonstrated to be due to phonon black-body radiation, without any scattering. See also: News and Views by Cho & Goodson Giant switchable photovoltaic effect in organometal trihalide perovskite devices   pp193 - 198 Zhengguo Xiao, Yongbo Yuan, Yuchuan Shao, Qi Wang, Qingfeng Dong, Cheng Bi, Pankaj Sharma, Alexei Gruverman & Jinsong Huang doi:10.1038/nmat4150 The direction of the current photogenerated in organic–inorganic perovskite films can be switched by poling the material with low electric fields that induce a reversible ion drift. Hybrid perovskites may thus find application as memristor devices. See also: News and Views by Park Layered memristive and memcapacitive switches for printable electronics   pp199 - 204 Alexander A. Bessonov, Marina N. Kirikova, Dmitrii I. Petukhov, Mark Allen, Tapani Ryhänen & Marc J. A. Bailey doi:10.1038/nmat4135 Memristors promise to emulate the appealing characteristics of biological neural systems. Solution-processed heterostructures are now shown to behave as memristive and memcapacitive switches compatible with printed electronics applications. Layered oxygen-deficient double perovskite as an efficient and stable anode for direct hydrocarbon solid oxide fuel cells   pp205 - 209 Sivaprakash Sengodan, Sihyuk Choi, Areum Jun, Tae Ho Shin, Young-Wan Ju, Hu Young Jeong, Jeeyoung Shin, John T. S. Irvine & Guntae Kim doi:10.1038/nmat4166 Layered double perovskites are promising as solid oxide fuel cell electrodes because of favourable transport properties. Related layered materials are now used as high-performance anodes that exhibit redox stability when exposed to hydrocarbon fuels. Articles Top Orbital-driven nematicity in FeSe   pp210 - 214 S-H. Baek, D. V. Efremov, J. M. Ok, J. S. Kim, Jeroen van den Brink & B. Büchner doi:10.1038/nmat4138 Iron selenide is an appealingly clean system for understanding the origin of superconductivity in iron pnictides. A detailed NMR study shows that the nematic order preceding the superconducting phase is driven by orbital degrees of freedom. Heterogeneous nucleation and shape transformation of multicomponent metallic nanostructures   pp215 - 223 Soon Gu Kwon, Galyna Krylova, Patrick J. Phillips, Robert F. Klie, Soma Chattopadhyay, Tomohiro Shibata, Emilio E. Bunel, Yuzi Liu, Vitali B. Prakapenka, Byeongdu Lee & Elena V. Shevchenko doi:10.1038/nmat4115 The detailed nucleation and growth kinetics and the crystal structure of catalytically relevant CoPt3/Au, FePt/Au and Pt/Au metal dumbbell nanoparticles have been obtained by in situ synchrotron small- and wide-angle X-ray scattering techniques. Breaking of macroscopic centric symmetry in paraelectric phases of ferroelectric materials and implications for flexoelectricity   pp224 - 229 Alberto Biancoli, Chris M. Fancher, Jacob L. Jones & Dragan Damjanovic doi:10.1038/nmat4139 The unexpectedly large flexoelectric response in ferroelectric perovskite materials is now shown to be induced by macroscopic symmetry breaking in paraelectric phases. Origin of voltage decay in high-capacity layered oxide electrodes   pp230 - 238 M. Sathiya, A. M. Abakumov, D. Foix, G. Rousse, K. Ramesha, M. Saubanére, M. L. Doublet, H. Vezin, C. P. Laisa, A. S. Prakash, D. Gonbeau, G. VanTendeloo & J-M. Tarascon doi:10.1038/nmat4137 Although Li-rich layered oxides are attractive electrode materials for batteries, they suffer from voltage decay on cycling. A correlation between trapped metal ions in interstitial tetrahedral sites and voltage decay is established, which could prove useful for developing high-capacity electrodes without decay. Eliminating degradation in solid oxide electrochemical cells by reversible operation   pp239 - 244 Christopher Graves, Sune Dalgaard Ebbesen, Søren Højgaard Jensen, Søren Bredmose Simonsen & Mogens Bjerg Mogensen doi:10.1038/nmat4165 Although solid oxide electrochemical cells can store electricity and convert fuels to electricity, their development is limited by long-term stability. Degradation is now eliminated by reversibly cycling between electrolysis and fuel-cell modes. Top Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. For event advertising opportunities across the Nature Publishing Group portfolio please contact natureevents@nature.com More Nature Events

You have been sent this Table of Contents Alert because you have opted in to receive it. You can change or discontinue your e-mail alerts at any time, by modifying your preferences on your nature.com account at: www.nature.com/myaccount (You will need to log in to be recognised as a nature.com registrant) For further technical assistance, please contact our registration department For print subscription enquiries, please contact our subscription department For other enquiries, please contact our customer feedback department Nature Publishing Group | 75 Varick Street, 9th Floor | New York | NY 10013-1917 | USA Nature Publishing Group's worldwide offices: London - Paris - Munich - New Delhi - Tokyo - Melbourne San Diego - San Francisco - Washington - New York - Boston Macmillan Publishers Limited is a company incorporated in England and Wales under company number 785998 and whose registered office is located at Brunel Road, Houndmills, Basingstoke, Hampshire RG21 6XS. © 2015 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.