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Nature Materials

Qiushi Guo, Renwen Yu, Cheng Li, Shaofan Yuan, Bingchen Deng, F Javier García de Abajo, Fengnian Xia
In the version of this Article originally published, the units of the right-hand y axis of Fig. 2a were incorrectly labelled as mS; they should have been µS. Also, the x-axis tick marks of Fig. 3b should have been aligned with Fig. 3a,c. These have now been corrected.
September 10, 2018: Nature Materials
Rafael Quintero-Bermudez, Aryeh Gold-Parker, Andrew H Proppe, Rahim Munir, Zhenyu Yang, Shana O Kelley, Aram Amassian, Michael F Toney, Edward H Sargent
Reduced-dimensional metal halide perovskites (RDPs) have attracted significant attention in recent years due to their promising light harvesting and emissive properties. We sought to increase the systematic understanding of how RDPs are formed. Here we report that layered intermediate complexes formed with the solvent provide a scaffold that facilitates the nucleation and growth of RDPs during annealing, as observed via in situ X-ray scattering. Transient absorption spectroscopy of RDP single crystals and films enables the identification of the distribution of quantum well thicknesses...
September 10, 2018: Nature Materials
Tino Gottschall, Adrià Gràcia-Condal, Maximilian Fries, Andreas Taubel, Lukas Pfeuffer, Lluís Mañosa, Antoni Planes, Konstantin P Skokov, Oliver Gutfleisch
The giant magnetocaloric effect, in which large thermal changes are induced in a material on the application of a magnetic field, can be used for refrigeration applications, such as the cooling of systems from a small to a relatively large scale. However, commercial uptake is limited. We propose an approach to magnetic cooling that rejects the conventional idea that the hysteresis inherent in magnetostructural phase-change materials must be minimized to maximize the reversible magnetocaloric effect. Instead, we introduce a second stimulus, uniaxial stress, so that we can exploit the hysteresis...
September 10, 2018: Nature Materials
N Badwe, X Chen, D K Schreiber, M J Olszta, N R Overman, E K Karasz, A Y Tse, S M Bruemmer, K Sieradzki
Intergranular stress-corrosion cracking (IGSCC) is a form of environmentally induced crack propagation causing premature failure of elemental metals and alloys. It is believed to require the simultaneous presence of tensile stress and corrosion; however, the exact nature of this synergy has eluded experimental identification. For noble metal alloys such as Ag-Au, IGSCC is a consequence of dealloying corrosion, forming a nanoporous gold layer that is believed to have the ability to transmit cracks into grain boundaries in un-dealloyed parent phase via a pure mechanical process...
September 10, 2018: Nature Materials
Kai Leng, Ibrahim Abdelwahab, Ivan Verzhbitskiy, Mykola Telychko, Leiqiang Chu, Wei Fu, Xiao Chi, Na Guo, Zhihui Chen, Zhongxin Chen, Chun Zhang, Qing-Hua Xu, Jiong Lu, Manish Chhowalla, Goki Eda, Kian Ping Loh
Due to their layered structure, two-dimensional Ruddlesden-Popper perovskites (RPPs), composed of multiple organic/inorganic quantum wells, can in principle be exfoliated down to few and single layers. These molecularly thin layers are expected to present unique properties with respect to the bulk counterpart, due to increased lattice deformations caused by interface strain. Here, we have synthesized centimetre-sized, pure-phase single-crystal RPP perovskites (CH3 (CH2 )3 NH3 )2 (CH3 NH3 )n-1 Pbn I3n+1 (n = 1-4) from which single quantum well layers have been exfoliated...
September 10, 2018: Nature Materials
A Kostin, P O Sprau, A Kreisel, Yi Xue Chong, A E Böhmer, P C Canfield, P J Hirschfeld, B M Andersen, J C Séamus Davis
Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high-temperature superconductivity. By contrast, the parent phase of an iron-based high-temperature superconductor is never a correlated insulator. However, this distinction may be deceptive because Fe has five actived d orbitals while Cu has only one. In theory, such orbital multiplicity can generate a Hund's metal state, in which alignment of the Fe spins suppresses inter-orbital fluctuations, producing orbitally selective strong correlations...
September 3, 2018: Nature Materials
Massimo Capone
No abstract text is available yet for this article.
September 3, 2018: Nature Materials
Qiushi Guo, Renwen Yu, Cheng Li, Shaofan Yuan, Bingchen Deng, F Javier García de Abajo, Fengnian Xia
Optical excitation and subsequent decay of graphene plasmons can produce a significant increase in charge-carrier temperature. An efficient method to convert this temperature elevation into electrical signals can enable important mid-infrared applications. However, the modest thermoelectric coefficient and weak temperature dependence of carrier transport in graphene hinder this goal. Here, we demonstrate mid-infrared graphene detectors consisting of arrays of plasmonic resonators interconnected by quasi-one-dimensional nanoribbons...
August 27, 2018: Nature Materials
Yongtao Liu, Liam Collins, Roger Proksch, Songkil Kim, Brianna R Watson, Benjamin Doughty, Tessa R Calhoun, Mahshid Ahmadi, Anton V Ievlev, Stephen Jesse, Scott T Retterer, Alex Belianinov, Kai Xiao, Jingsong Huang, Bobby G Sumpter, Sergei V Kalinin, Bin Hu, Olga S Ovchinnikova
The extraordinary optoelectronic performance of hybrid organic-inorganic perovskites has resulted in extensive efforts to unravel their properties. Recently, observations of ferroic twin domains in methylammonium lead triiodide drew significant attention as a possible explanation for the current-voltage hysteretic behaviour in these materials. However, the properties of the twin domains, their local chemistry and the chemical impact on optoelectronic performance remain unclear. Here, using multimodal chemical and functional imaging methods, we unveil the mechanical origin of the twin domain contrast observed with piezoresponse force microscopy in methylammonium lead triiodide...
August 27, 2018: Nature Materials
Harry A Atwater, Artur R Davoyan, Ognjen Ilic, Deep Jariwala, Michelle C Sherrott, Cora M Went, William S Whitney, Joeson Wong
In the version of this Perspective originally published, the titles of the references were missing; all versions have now been amended to include them.
August 16, 2018: Nature Materials
Christian S Diercks, Yuzhong Liu, Kyle E Cordova, Omar M Yaghi
In the version of this Perspective originally published, the titles of the references were missing; the online versions have now been amended to include them.
August 7, 2018: Nature Materials
Yiming Song, Davide Mandelli, Oded Hod, Michael Urbakh, Ming Ma, Quanshui Zheng
Structural superlubricity is a fascinating tribological phenomenon, in which the lateral interactions between two incommensurate contacting surfaces are effectively cancelled resulting in ultralow sliding friction. Here we report the experimental realization of robust superlubricity in microscale monocrystalline heterojunctions, which constitutes an important step towards the macroscopic scale-up of superlubricity. The results for interfaces between graphite and hexagonal boron nitride clearly demonstrate that structural superlubricity persists even when the aligned contact sustains external loads under ambient conditions...
July 30, 2018: Nature Materials
Sencer Selcuk, Xunhua Zhao, Annabella Selloni
The excellent photocatalytic properties of titanium oxide (TiO2 ) under ultraviolet light have long motivated the search for doping strategies capable of extending its photoactivity to the visible part of the spectrum. One approach is high-pressure and high-temperature hydrogenation, which results in reduced 'black TiO2 ' nanoparticles with a crystalline core and a disordered shell that absorbs visible light. Here we elucidate the formation mechanism and structural features of black TiO2 using first-principles-validated reactive force field molecular dynamics simulations of anatase TiO2 surfaces and nanoparticles at high temperature and under high hydrogen pressures...
July 16, 2018: Nature Materials
X He, H Htoon, S K Doorn, W H P Pernice, F Pyatkov, R Krupke, A Jeantet, Y Chassagneux, C Voisin
In the version of this Perspective originally published, the x-axis label of Fig. 1d was missing; it should have read 'Wavelength (nm)'. The units of the y axis of Fig. 3b were incorrect; they should have been meV. And the citation of Fig. 3c in the main text was incorrect; it should have been to Fig. 3b. These issues have now been corrected.
July 11, 2018: Nature Materials
Omid Zandi, Ankit Agrawal, Alex B Shearer, Lauren C Reimnitz, Clayton J Dahlman, Corey M Staller, Delia J Milliron
Degenerately doped semiconductor nanocrystals (NCs) exhibit a localized surface plasmon resonance (LSPR) in the infrared range of the electromagnetic spectrum. Unlike metals, semiconductor NCs offer tunable LSPR characteristics enabled by doping, or via electrochemical or photochemical charging. Tuning plasmonic properties through carrier density modulation suggests potential applications in smart optoelectronics, catalysis and sensing. Here, we elucidate fundamental aspects of LSPR modulation through dynamic carrier density tuning in Sn-doped In2 O3 (Sn:In2 O3 ) NCs...
July 9, 2018: Nature Materials
D A Pesin
No abstract text is available yet for this article.
September 2018: Nature Materials
Philip Ball
No abstract text is available yet for this article.
September 2018: Nature Materials
Arkady V Krasheninnikov
No abstract text is available yet for this article.
September 2018: Nature Materials
Jörn Dunkel
No abstract text is available yet for this article.
September 2018: Nature Materials
Gregor Fuhrmann
No abstract text is available yet for this article.
September 2018: Nature Materials
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