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Strain engineering and epitaxial stabilization of halide perovskites 期刊论文
NATURE, 2020, 577 (7789) : 209-+
作者:  Chen, Yimu;  Lei, Yusheng;  Li, Yuheng;  Yu, Yugang;  Cai, Jinze;  Chiu, Ming-Hui;  Rao, Rahul;  Gu, Yue;  Wang, Chunfeng;  Choi, Woojin;  Hu, Hongjie;  Wang, Chonghe;  Li, Yang;  Song, Jiawei;  Zhang, Jingxin;  Qi, Baiyan;  Lin, Muyang;  Zhang, Zhuorui;  Islam, Ahmad E.;  Maruyama, Benji;  Dayeh, Shadi;  Li, Lain-Jong;  Yang, Kesong;  Lo, Yu-Hwa;  Xu, Sheng
收藏  |  浏览/下载:26/0  |  提交时间:2020/07/03

Strain engineering is a powerful tool with which to enhance semiconductor device performance(1,2). Halide perovskites have shown great promise in device applications owing to their remarkable electronic and optoelectronic properties(3-5). Although applying strain to halide perovskites has been frequently attempted, including using hydrostatic pressurization(6-8), electrostriction(9), annealing(10-12), van der Waals force(13), thermal expansion mismatch(14), and heat-induced substrate phase transition(15), the controllable and device-compatible strain engineering of halide perovskites by chemical epitaxy remains a challenge, owing to the absence of suitable lattice-mismatched epitaxial substrates. Here we report the strained epitaxial growth of halide perovskite single-crystal thin films on lattice-mismatched halide perovskite substrates. We investigated strain engineering of a-formamidinium lead iodide (alpha-FAPbI(3)) using both experimental techniques and theoretical calculations. By tailoring the substrate composition-and therefore its lattice parameter-a compressive strain as high as 2.4 per cent is applied to the epitaxial alpha-FAPbI(3) thin film. We demonstrate that this strain effectively changes the crystal structure, reduces the bandgap and increases the hole mobility of alpha-FAPbI(3). Strained epitaxy is also shown to have a substantial stabilization effect on the alpha-FAPbI(3) phase owing to the synergistic effects of epitaxial stabilization and strain neutralization. As an example, strain engineering is applied to enhance the performance of an alpha-FAPbI(3)-based photodetector.


  
Reply to 'Evidence for simple volcanic rifting not complex subduction initiation in the Laxmi Basin' 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Pandey, Dhananjai K.;  Pandey, Anju;  Whattam, Scott A.
收藏  |  浏览/下载:0/0  |  提交时间:2020/06/09
Field-resolved infrared spectroscopy of biological systems 期刊论文
NATURE, 2020, 577 (7788) : 52-+
作者:  Pupeza, Ioachim;  Huber, Marinus;  Trubetskov, Michael;  Schweinberger, Wolfgang;  Hussain, Syed A.;  Hofer, Christina;  Fritsch, Kilian;  Poetzlberger, Markus;  Vamos, Lenard;  Fill, Ernst;  Amotchkina, Tatiana;  Kepesidis, Kosmas V.;  Apolonski, Alexander;  Karpowicz, Nicholas;  Pervak, Vladimir;  Pronin, Oleg;  Fleischmann, Frank;  Azzeer, Abdallah;  Zigman, Mihaela;  Krausz, Ferenc
收藏  |  浏览/下载:14/0  |  提交时间:2020/07/03

The proper functioning of living systems and physiological phenotypes depends on molecular composition. Yet simultaneous quantitative detection of a wide variety of molecules remains a challenge(1-8). Here we show how broadband optical coherence opens up opportunities for fingerprinting complex molecular ensembles in their natural environment. Vibrationally excited molecules emit a coherent electric field following few-cycle infrared laser excitation(9-12), and this field is specific to the sample'  s molecular composition. Employing electro-optic sampling(10,12-15), we directly measure this global molecular fingerprint down to field strengths 10(7) times weaker than that of the excitation. This enables transillumination of intact living systems with thicknesses of the order of 0.1 millimetres, permitting broadband infrared spectroscopic probing of human cells and plant leaves. In a proof-of-concept analysis of human blood serum, temporal isolation of the infrared electric-field fingerprint from its excitation along with its sampling with attosecond timing precision results in detection sensitivity of submicrograms per millilitre of blood serum and a detectable dynamic range of molecular concentration exceeding 10(5). This technique promises improved molecular sensitivity and molecular coverage for probing complex, real-world biological and medical settings.


  
Extracellular electron transfer-dependent anaerobic oxidation of ammonium by anammox bacteria 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Shaw, Dario R.;  Ali, Muhammad;  Katuri, Krishna P.;  Gralnick, Jeffrey A.;  Reimann, Joachim;  Mesman, Rob;  van Niftrik, Laura;  Jetten, Mike S. M.;  Saikaly, Pascal E.
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
Rebuilding marine life 期刊论文
NATURE, 2020, 580 (7801) : 39-51
作者:  Carlos M. Duarte;  Susana Agusti;  Edward Barbier;  Gregory L. Britten;  Juan Carlos Castilla;  Jean-Pierre Gattuso;  Robinson W. Fulweiler;  Terry P. Hughes;  Nancy Knowlton;  Catherine E. Lovelock;  Heike K. Lotze;  Milica Predragovic;  Elvira Poloczanska;  Callum Roberts;  Boris Worm
收藏  |  浏览/下载:12/0  |  提交时间:2020/05/13

Sustainable Development Goal 14 of the United Nations aims to "conserve and sustainably use the oceans, seas and marine resources for sustainable development". Achieving this goal will require rebuilding the marine life-support systems that deliver the many benefits that society receives from a healthy ocean. Here we document the recovery of marine populations, habitats and ecosystems following past conservation interventions. Recovery rates across studies suggest that substantial recovery of the abundance, structure and function of marine life could be achieved by 2050, if major pressures-including climate change-are mitigated. Rebuilding marine life represents a doable Grand Challenge for humanity, an ethical obligation and a smart economic objective to achieve a sustainable future.


  
Study of SO2 Pollution in the Middle East Using MERRA-2, CAMS Data Assimilation Products, and High-Resolution WRF-Chem Simulations 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (6)
作者:  Ukhov, A.;  Mostamandi, S.;  Krotkov, N.;  Flemming, J.;  da Silva, A.;  Li, C.;  Fioletov, V.;  McLinden, C.;  Anisimov, A.;  Alshehri, Y. M.;  Stenchikov, G.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
Role of vegetated coastal ecosystems as nitrogen and phosphorous filters and sinks in the coasts of Saudi Arabia 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Saderne, V;  Cusack, M.;  Serrano, O.;  Almahasheer, H.;  Krishnakumar, P. K.;  Rabaoui, L.;  Qurban, M. A.;  Duarte, C. M.
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02
blue carbon  nitrogen  phosphorus  mangrove  seagrass  Red Sea  Arabian Gulf  
Fast Transport Pathways Into the Northern Hemisphere Upper Troposphere and Lower Stratosphere During Northern Summer 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (3)
作者:  Wu, Yutian;  Orbe, Clara;  Tilmes, Simone;  Abalos, Marta;  Wang, Xinyue
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
MAFG-driven astrocytes promote CNS inflammation 期刊论文
NATURE, 2020, 578 (7796) : 593-+
作者:  Clark, Peter U.;  He, Feng;  Golledge, Nicholas R.;  Mitrovica, Jerry X.;  Dutton, Andrea;  Hoffman, Jeremy S.;  Dendy, Sarah
收藏  |  浏览/下载:38/0  |  提交时间:2020/07/03

Multiple sclerosis is a chronic inflammatory disease of the CNS1. Astrocytes contribute to the pathogenesis of multiple sclerosis(2), but little is known about the heterogeneity of astrocytes and its regulation. Here we report the analysis of astrocytes in multiple sclerosis and its preclinical model experimental autoimmune encephalomyelitis (EAE) by single-cell RNA sequencing in combination with cell-specific Ribotag RNA profiling, assay for transposase-accessible chromatin with sequencing (ATAC-seq), chromatin immunoprecipitation with sequencing (ChIP-seq), genome-wide analysis of DNA methylation and in vivo CRISPR-Cas9-based genetic perturbations. We identified astrocytes in EAE and multiple sclerosis that were characterized by decreased expression of NRF2 and increased expression of MAFG, which cooperates with MAT2 alpha to promote DNA methylation and represses antioxidant and anti-inflammatory transcriptional programs. Granulocyte-macrophage colony-stimulating factor (GM-CSF) signalling in astrocytes drives the expression of MAFG and MAT2 alpha and pro-inflammatory transcriptional modules, contributing to CNS pathology in EAE and, potentially, multiple sclerosis. Our results identify candidate therapeutic targets in multiple sclerosis.


Single-cell RNA sequencing of cells from humans with multiple sclerosis and mice with a model of the disease identifies a population of disease-promoting astrocytes in which anti-oxidant and anti-inflammatory proteins are suppressed.


  
The Role of the SO2 Radiative Effect in Sustaining the Volcanic Winter and Soothing the Toba Impact on Climate 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (2)
作者:  Osipov, Sergey;  Stenchikov, Georgiy;  Tsigaridis, Kostas;  LeGrande, Allegra N.;  Bauer, Susanne E.
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02