Nature Materials contents: September 2014 Volume 13 Number 9 pp 837-911

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TABLE OF CONTENTS September 2014 Volume 13, Issue 9 Editorial Commentary Research Highlights News and Views Letters Articles Subscribe   Facebook   RSS   Recommend to library   Twitter   Advertisement Nature has once again been ranked the N0.1 weekly science journal with an Impact Factor of 42.351*. To celebrate we are offering you the opportunity to subscribe at an exclusive limited time offer of only $42, £42 or €42. This is a limited time offer - so don't miss out and subscribe today! *2013 Journal Citation Reports® (Thomson Reuters, 2014)      Editorial Top Perovskite fever   p837 doi:10.1038/nmat4079 Staggering increases in the performance of organic–inorganic perovskite solar cells have renewed the interest in these materials. However, further developments and the support from academic and industrial partners will hinge on the reporting of accurate efficiency values. Commentary Top The light and shade of perovskite solar cells   pp838 - 842 Michael Grätzel doi:10.1038/nmat4065 The rise of metal halide perovskites as light harvesters has stunned the photovoltaic community. As the efficiency race continues, questions on the control of the performance of perovskite solar cells and on its characterization are being addressed. Research Highlights Top Boron clusters | Headache relief | Resolved by gold | Symmetry breaking in metamaterials | Mapping in-cell topology News and Views Top Oxide heterostructures: Atoms on the move   pp844 - 845 Guus Rijnders doi:10.1038/nmat4071 The epitaxial growth of oxide heterostructures is generally thought to occur in a deterministic fashion. Recent results on the Ruddlesden–Popper phases show this is not always the case, and that a dynamic rearrangement of the layers during growth can spring up surprises. See also: Article by Lee et al. Perovskite solar cells: Continuing to soar   pp845 - 846 Michael D. McGehee doi:10.1038/nmat4050 The dream of printing highly efficient solar cells is closer than ever to being realized. Solvent engineering has enabled the deposition of uniform perovskite semiconductor films that yield greater than 15% power-conversion efficiency. See also: Article by Jeon et al. Chiral plasmonic nanostructures: Twisted by DNA   pp846 - 848 Andrea Di Falco doi:10.1038/nmat4068 The optical properties of self-assembled plasmonic nanoparticles can be reversibly tuned by using DNA strands. See also: Letter by Kuzyk et al. Acoustic metamaterials: Nearly perfect sound absorbers   pp848 - 849 Mathias Fink doi:10.1038/nmat4067 Membrane-based acoustic resonators of subwavelength dimensions achieve nearly perfect acoustic absorption. See also: Article by Ma et al. Self-healing polymers: Sticky when wet   pp849 - 850 Jonathan J. Wilker doi:10.1038/nmat4070 Inspired by the chemistry of adhesive proteins in mussels, hydrogels can now be made to self-heal in water without the aid of metal chelates. See also: Letter by Ahn et al. Material witness: Yoghurt under stress   p850 Philip Ball doi:10.1038/nmat4063 Nature Materials JOBS of the week Assistant Professor of Electronic & Photonic Materials University of California - Santa Barbara PhD top-up scholarship in molecular modelling of mixed materials CSIRO (Commonwealth Scientific and Industrial Research Organisation) PhD student position in organic synthesis of new solar energy materials Chalmers University of Technology Materials Physics Group -Teizer Lab- Assistant Prof. Advanced Institute for Materials Research, Tohoku University Nanowire materials, photonic devices, and solar fuels McGill University Research Scientist / Post-doc in Bioinspired and Biomimetic Polymer and Peptidic Hybrid Materials. Nanyang Technological University (NTU) More Science jobs from Nature Materials EVENT The Energy & Materials Research Conference - EMR2015 25.02.14 Madrid, Spain More science events from Letters Top Landau quantization and quasiparticle interference in the three-dimensional Dirac semimetal Cd3As2   pp851 - 856 Sangjun Jeon, Brian B. Zhou, Andras Gyenis, Benjamin E. Feldman, Itamar Kimchi, Andrew C. Potter, Quinn D. Gibson, Robert J. Cava, Ashvin Vishwanath and Ali Yazdani doi:10.1038/nmat4023 Three-dimensional Dirac semimetals such as Cd3As2 are attracting attention because their electronic structure can be considered to be the three-dimensional analogue of graphene’s. Low-temperature scanning tunnelling measurements of the 112 cleavage plane of Cd3As2 now reveal its electronic structure down to atomic length scales, as well as its Landau spectrum and quasiparticle interference pattern. Non-thermal separation of electronic and structural orders in a persisting charge density wave   pp857 - 861 M. Porer, U. Leierseder, J.-M. Ménard, H. Dachraoui, L. Mouchliadis, I. E. Perakis, U. Heinzmann, J. Demsar, K. Rossnagel and R. Huber doi:10.1038/nmat4042 The electronic and structural components of charge density waves occurring in layered transition metal dichalcogenides are known to be interdependent, yet have only been probed in separate measurements. Now, a broadband terahertz spectroscopy approach that monitors the evolution of these two order parameters simultaneously is demonstrated. Reconfigurable 3D plasmonic metamolecules   pp862 - 866 Anton Kuzyk, Robert Schreiber, Hui Zhang, Alexander O. Govorov, Tim Liedl and Na Liu doi:10.1038/nmat4031 Until now, it has not been possible to switch chirality in plasmonic nanostructures at will and repeatedly. Now, thanks to DNA-regulated conformational changes, reconfigurable 3D plasmonic metamolecules with switchable chirality have been created. See also: News and Views by Di Falco Surface-initiated self-healing of polymers in aqueous media   pp867 - 872 B. Kollbe Ahn, Dong Woog Lee, Jacob N. Israelachvili and J. Herbert Waite doi:10.1038/nmat4037 Synthetic polymers functionalized with mussel-inspired catechols have been shown to exhibit self-healing and adhesive properties, mediated by metal chelation, that are much needed in biomedical and environmental applications. Now, a metal-free approach to complete polymer self-healing underwater mediated by extensive hydrogen bonding in catechol-functionalized polyacrylates is reported. See also: News and Views by Wilker Articles Top Acoustic metasurface with hybrid resonances   pp873 - 878 Guancong Ma, Min Yang, Songwen Xiao, Zhiyu Yang and Ping Sheng doi:10.1038/nmat3994 Acoustic impedance-matched surfaces do not reflect incident waves. Traditional means of acoustic absorption have so far resulted in imperfect impedance matching and bulky structures, or require costly and sophisticated electrical design. Inspired by electromagnetic metamaterials, a subwavelength acoustically reflecting surface with hybrid resonances and impedance-matched to airborne sound at tunable frequencies is now demonstrated. See also: News and Views by Fink Dynamic layer rearrangement during growth of layered oxide films by molecular beam epitaxy   pp879 - 883 J. H. Lee, G. Luo, I. C. Tung, S. H. Chang, Z. Luo, M. Malshe, M. Gadre, A. Bhattacharya, S. M. Nakhmanson, J. A. Eastman, H. Hong, J. Jellinek, D. Morgan, D. D. Fong and J. W. Freeland doi:10.1038/nmat4039 Although the Ruddlesden–Popper series of compounds offer a range of appealing properties, their fabrication in thin-film form has been challenging. Using molecular beam epitaxy, layered oxide films of this family are synthesized, and shown to undergo a dynamical rearrangement during the growth process. See also: News and Views by Rijnders Visualization of oscillatory behaviour of Pt nanoparticles catalysing CO oxidation   pp884 - 890 S. B. Vendelbo, C. F. Elkjær, H. Falsig, I. Puspitasari, P. Dona, L. Mele, B. Morana, B. J. Nelissen, R. van Rijn, J. F. Creemer, P. J. Kooyman and S. Helveg doi:10.1038/nmat4033 Many catalytic reactions exhibit oscillatory behaviour but these oscillations are not well understood for catalysts consisting of supported nanoparticles. The study of oscillatory CO oxidation catalysed by Pt nanoparticles now reveals that periodic changes in the CO oxidation are synchronous with a periodic refacetting of the Pt nanoparticles. Narrow-band red-emitting Sr[LiAl3N4]:Eu2+ as a next-generation LED-phosphor material   pp891 - 896 Philipp Pust, Volker Weiler, Cora Hecht, Andreas Tücks, Angela S. Wochnik, Ann-Kathrin Henß, Detlef Wiechert, Christina Scheu, Peter J. Schmidt and Wolfgang Schnick doi:10.1038/nmat4012 For high-power white-light-emitting diodes (LEDs) to become a technological reality there is a need to find more efficient red-emitting phosphor materials. Eu2+-doped Sr[LiAl3N4], a member of the nitridoaluminates compound class, is now proved to be a high-performance narrow-band red-emitting phosphor material that can be easily coupled with existing GaN-based blue-LED technology for use in white LEDs. Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cells   pp897 - 903 Nam Joong Jeon, Jun Hong Noh, Young Chan Kim, Woon Seok Yang, Seungchan Ryu and Sang Il Seok doi:10.1038/nmat4014 The performance of solar cells based on organic–inorganic perovskites strongly depends on the device architecture and processing conditions. It is now shown that solvent engineering enables the deposition of very dense perovskite layers on mesoporous titania, leading to photovoltaic devices with a high light-conversion efficiency and no hysteresis. See also: News and Views by McGehee Etchable plasmonic nanoparticle probes to image and quantify cellular internalization   pp904 - 911 Gary B. Braun, Tomas Friman, Hong-Bo Pang, Alessia Pallaoro, Tatiana Hurtado de Mendoza, Anne-Mari A. Willmore, Venkata Ramana Kotamraju, Aman P. Mann, Zhi-Gang She, Kazuki N. Sugahara, Norbert O. Reich, Tambet Teesalu and Erkki Ruoslahti doi:10.1038/nmat3982 Nanoparticle-based fluorescence imaging does not usually allow cell membrane-bound particles and intracellular particles to be distinguished from each other. Now, using functionalized silver nanoparticles as plasmonic probes, this distinction can be made following a rapid, non-toxic etching process that selectively removes the extracellular nanoparticles but leaves the intracellular nanoparticles unharmed. Top Advertisement New from Nature Publishing Group- Nature Research Briefings Nature Research Briefings: Graphene is a collection of recently published Research Highlights and News and Views selected from across the Nature Publishing Group journals. Each edition of Nature Research Briefings highlights some of the latest and most exciting developments in key areas of interest.  Available for FREE as a downloadable PDF.     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. 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