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Pyrenetetraone-based covalent organic framework as an effective electrocatalyst for oxygen reduction reaction

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Nano Research 2022年第5期15卷 3907-3912页

作者： Paloma Garcia-Arroyo Emiliano Martinez-Perinan Jorge J.Cabrera-Trujillo Elena Salagre Enrique G.Michel Jose i.Martinez Encarnacion Lorenzo Jose L.Segura departamento de Quimica Organica i Facultad de CC.QuimicasUniversidad Complutense de Madrid28040 MadridSpain departamento de Quimica Analitica y Analisis instrumental Facultad de CienciasUniversidad Autónoma de Madrid28049 MadridSpain departamento de fisica de la materia condensada Universidad Autónoma de Madrid28049 MadridSpain Condensed Matter Physics Center(iFiMAC) Universidad Autónoma de Madrid28049 MadridSpain departamento de Nanoestructuras SuperficiesRecubrimientos y Astrofisica MolecularInstituto de Ciencia de Materiales de Madrid(ICMMCSIC)28049 MadridSpain instituto Madrileno de Estudios Avanzados en Nanociencia(iMdeA-Nanociencia) 28049 MadridSpain institute for Advanced Research in Chemical Sciences(iAdChem) Universidad Autonoma de Madrid28049 MadridSpain

A novel porous and crystalline two-dimensional(2D)electrochemically active covalent organic framework(COF)based on ortho-quinone units has been prepared as an innovative approach towards the development of organic cathode materials with multiple redox sites as an efficient electrocatalyst for the oxygen reduction reaction(ORR).in contrast with most of the previously reported COFs as electrocatalysts for the ORR,the electrocatalytic application of this material towards ORR has been investigated without adding any metal or conductive supporting material and avoiding any additional carbonization ***,the electrochemical properties of the COF material have been compared with two analogue amorphous frameworks with similar chemical composition,which points out the important role of the enhanced crystallinity and porosity of the COF network in its superior performance as an electrocatalyst towards ORR.

关键词： electrocatalysis oxygen reduction reaction metal free pyrenetetraone covalent organic framework

Editorial for a special issue on graphene and 2D alternative materials:From preparation to potential applications

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Nano materials Science 2022年第1期4卷 1-2页

作者： Pablo Ares Felix Zamora departamento de fisica de la materia condensada and Condensed Matter Physics Center(iFiMAC) Universidad Autonoma de Madrid Madrid28049Spain departamento de Quimica inorganica Condensed Matter Physics Center(IFIMAC)and Institute for Advanced Research in Chemical Sciences(IAdChem)Universidad Autonoma de MadridMadrid28049Spain instituto Madrileno de Estudios Avanzados en Nanociencia(iMdeA-Nanociencia) CantoblancoMadrid28049Spain

The isolation of graphene and subsequent studies showed that obtaining atomically thin crystalline sheets was feasible and possessed extraordinary *** result opened the door to an entirely new family of materials known as two-dimensional or 2D *** in this field is intense:the emergence of new 2D materials,the properties of their combinations and the ability of graphene to reinvent itself,showing novel and exciting properties,make it likely that this field will continue to be one of the leading topics of materials science and condensed matter physics.

关键词： preparation entirely crystalline

A plasmonic route for the integrated wireless communication of subdiffraction-limited signals

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Light(Science & Applications) 2020年第1期9卷 930-938页

作者： Hao Chi Zhang Le Peng Zhang Pei Hang He Jie Xu Cheng Qian Francisco J.Garcia-Vidal Tie Jun Cui State Key laboratory of Millimeter Waves Southeast University210096 NanjingChina departamento de fisica Teorica de la materia condensada and Condensed Matter Physics Center(iFiMAC) Universidad Autonoma de MadridMadridSpain Donostia international Physics Center(DiPC) Donostia/San SebastianSpain

Perfect lenses,superlenses and time-reversal mirrors can support and spatially separate evanescent waves,which is the basis for detecting subwavelength information in the far ***,the inherent limitations of these methods have prevented the development of systems to dynamically distinguish subdiffraction-limited *** the physical merits of spoof surface plasmon polaritons(SPPs),we demonstrate that subdiffraction-limited signals can be transmitted on planar integrated SPP channels with low loss,low channel interference,and high gain and can be radiated with a very low environmental ***,we show how deep subdiffraction-limited signals that are spatially coupled can be distinguished after line-of-sight wireless *** a visualized demonstration,we realize the high-quality wireless communication of two movies on subwavelength channels over the line of sight in real time using our plasmonic scheme,showing significant advantages over the conventional methods.

关键词： communication spatially diffraction

Erratum to:influence of metal support in-plane symmetry on the corrugation of hexagonal boron nitride and graphene monolayers

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Nano Research 2019年第5期12卷 1217-1218页

作者： Antonio J.Martinez-Galera Jose M.Gomez-Rodriguez departamento de fisica de la materia condensada Universidad Autonoma de MadridMadrid E-28049Spain Condensed Matter Physics Center(iFiMAC) Universidad Autonoma de MadridMadrid E-28049Spain instituto Nicolas Cabrera Universidad Autonoma de MadridMadrid E-28049Spain

The writings of the text on the last line,left column on the 4^th page and the text on lines 8^th,10^th,11^th and 16^th in the 4^th paragraph,left column and on lines from 1st to 8^th in the 1st paragraph,right column on the 5^th page,and the text on line 4^th in the 1^st paragraph,left column on the 9^th page,and Fig.3 and its caption on the 5^th page in the original version of this article were unfortunately incorrect.

关键词： corrugation hexagonal boron nitride graphene monolayers

Tailoring thermoelectric properties of Zr(0.43)Hf(0.57)NiSn half-Heusler compound by defect engineering

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Rare Metals 2020年第6期39卷 659-670页

作者： Krzysztof Galazka Wenjie Xie Sascha Populoh Myriam H.Aguirre Songhak Yoon Gesine Büttner Anke Weidenkaff institute of Plasma Physics and laser Microfusion Warsaw 01-497Poland department of materials Science Technische Universitat DarmstadtDarmstadt 64287Germany laboratory for Solid State Chemistry and Catalysis EmpaDlibendorf 8600Switzerland instituto de Nanociencia de Aragon Universidad de ZaragozaSaragossa 50018Spain departamento de fisica de la materia condensada Universidad de ZaragozaSaragossa 50009Spain laboratorio de Microscopias Avanzadas Universidad de ZaragozaSaragossa 50018Spain Fraunhofer Research institution for materials Recycling and Resource Strategies iWKS Hanau 63457Germany

The thermoelectric transport properties of Zr0.43Hf0.57 NiSn half-Heusler compounds were investigated for samples sintered with different spark plasma sintering(SPS)periods:8,32 and 72 *** means of scanning transmission electron microscopy with a highangular annular dark-field detector(STEM-HAADF),it was found that sintering time affected the defect concentration,namely the amount of Ni interstitial atoms,and created locally ordered inclusions of full-Heusler *** structural information,phase composition and electrical transport properties could be consistently explained by the assumption that Ni interstitials give rise to an impurity band situated about 100 meV below the bottom of the conduction band via a self-doping *** impurity band was found to merge with the conduction band for the sample with intermediate SPS *** effect was ascribed to the gradual dissolution of full-Heusler phase inclusions and production of interstitial Ni defects,which eventually vanished for the sample with the longest sintering *** was demonstrated that the modification of the density of states near the edge of the conduction band and enhanced overall charge carrier concentration provided by defect engineering led to overall 26%increase in the thermoelectric figure of merit(ZT)with respect to the other samples.

关键词： Thermoelectric Half-Heusler interstitial defect engineering

Fast and reliable identification of atomically thin layers of TaSe2 crystals

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Nano Research 2013年第3期6卷 191-199页

作者： Andres Castellanos-Gomez Efren Navarro-Moratalla Guillermo Mokry Jorge Quereda Elena Pinilla-Cienfuegos Nicolas Agrait Herre S. J. van der Zant Eugenio Coronado Gary A. Steele Gabino Rubio-Bollinger Kavli institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands instituto Ciencia Molecular (iCMol) Univ. Valencia C/Catedrdtico Jose Beltrdn 2 E-46980 Paterna Spain departamento de fisica de la materia condensada (C-iii). UniversidadAutonoma de Madrid Campus de Cantoblanco 28049 Madrid Spain instituto Madrileno de Estudios Avanzados en Nanociencia iMdeA-Nanociencia E-28049 Madrid Spain

deposition of clean and defect-free atomically thin two-dimensional crystalline flakes on surfaces by mechanical exfoliation of layered bulk materials has proven to be a powerful technique, but it requires a fast, reliable and non-destructive way to identify the atomically thin flakes among a crowd of thick flakes. in this work, we provide general guidelines to identify ultrathin flakes of TaSe2 by means of optical microscopy and Raman spectroscopy. Additionally, we determine the optimal substrates to facilitate the optical identification of atomically thin TaSe2 crystals. Experimental realization and isolation of ultrathin layers of TaSe2 enables future studies on the role of the dimensionality in interesting phenomena such as superconductivity and charge density waves.

关键词：光谱识别超薄层原子晶体光学显微镜电荷密度波超薄片散装物料

Te-seeded growth of few-quintuple layer Bi2Te3 nanoplates

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Nano Research 2014年第9期7卷 1243-1253页

作者： Yanyuan Zhao Maria de la Mata Richard L. J. Qiu Jun Zhang Xinglin wen Cesar Magen Xuan P. A. Gao Jordi Arbiol Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371 institut de Ciencia de materials de Barcelona ICMAB-CSIC E-08193 Bellaterra CAT Spain department of Physics Case Western Reserve University Cleveland Ohio 44106 USA laboratorio de Microscopfas Avanzadas (LMA) Instituto de Nanociencia de Aragon (INA) - ARAID and Departamento de Fisica de la Materia Condensada Universidad de Zaragoza 50018 Zaragoza Spain institucio Catalana de Recerca i Estudis Avancats (iCREA) 08010 Barcelona CAT Spain NOViTAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798

We report on a Te-seeded epitaxial growth of ultrathin Bi2Te3 nanoplates (down to three quintuple layers (QL)) with large planar sizes (up to tens of micrometers) through vapor transport. Optical contrast has been systematically investigated for the as-grown Bi2Te3 nanoplates on the SiO2/Si substrates, experimentally and computationally. The high and distinct optical contrast provides a fast and convenient method for the thickness determination of few-QL Bi2Te3 nanoplates. By aberration-corrected scanning transmission electron microscopy, a hexagonal crystalline structure has been identified for the Te seeds, which form naturally during the growth process and initiate an epitaxial growth of the rhombohedralstructured Bi2Te3 nanoplates. The epitaxial relationship between Te and Bi2Te3 is identified to be perfect along both in-plane and out-of-plane directions of the layered nanoplate. Similar growth mechanism might be expected for other bismuth chalcogenide layered materials.

关键词： Bi2Te3 纳米板种子透射电子显微镜外延生长晶体结构层状材料气相传输

Strain-induced band gap engineering in layered TiS3

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Nano Research 2018年第1期11卷 225-232页

作者： Robert Biele Eduardo Flores Jose Ramon Ares Carlos Sanchez isabel J. Ferrer Gabino Rubio-Bollinger Andres Castellanos-Gomezs Roberto D'Agosta Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (EFSF) Universidad del Pals Vasco 20018 San Sebastidn Spain materials of interest in Renewable Energies Group (MiRE Group) Dpto. de Fisica de Materiales Universidad Aut6noma de Madrid 28049 Madrid Spain instituto de Ciencia de materiales "Nicolds Cabrera" Campus de Cantoblanco 28049 Madrid Spain Dpto. de Ffsica de la materia condensada Condensed Matter Physics Center (IFIMAC) Universidad Aut6noma de Madrid Campus de Cantoblanco 28049 Madrid Spain instituto de Ciencia de los materiales de Madrid (iCMM-CSiC) Cantoblanco 28049 Madrid Spain iKERBASQUE Basque Foundation for Science 48013 Bilbao Spain

By combining ab initio calculations and experiments, we demonstrate how the band gap of the transition metal trichalcogenide TiS3 can be modified by inducing tensile or compressive strain. in addition, using our calculations, we predicted that the material would exhibit a transition from a direct to an indirect band gap upon application of a compressive strain in the direction of easy electrical transport. The ability to control the band gap and its nature could have a significant impact on the use of TiS3 for optical applications. We go on to verify our prediction via optical absorption experiments that demonstrate a band gap increase of up to 9% （from 0.99 to 1.08 eV） upon application of tensile stress along the easy transport direction.

关键词： band gap engineering titanium trisulfide 2-D materials strain

Strain-induced spatially indirect exciton recombination in zinc-blende/wurtzite CdS heterostructures

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Nano Research 2015年第9期8卷 3035-3044页

作者： dehui Li Yang Liu Maria de la Mata Cesar Magen Jordi Arbiol Yuanping Feng Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore institut de Ciencia de materials de Barcelona ICMAB-CSIC Campus de la UAB 08193 Bellaterra Catalonia Spain laboratofio de Microscopias Avanzadas (LMA) Instituto de Nanociencia de Aragon (INA) ARAiD and departamento de fisica de la materia condensada Universidad de Zaragoza 50018 Zaragoza Spain institucio Catalana de Recerca i Estudis Avancats (iCREA) 08010 Barcelona Catalonia Spain institut Catala de Nanociencia i Nanotecnologia (iCN2) Campus UAB 08193 Bellaterra Catalonia Spain department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore Division of Microelectronics School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798Singapore

Strain engineering provides an effective mean of tuning the fundamental properties of semiconductors for electric and optoelectronic applications. Here we report on how the applied strain changes the emission properties of hetero- structures consisting of different crystalline phases in the same CdS nanobelts. The strained portion was found to produce an additional emission peak on the low-energy side that was blueshifted with increasing strain. Furthermore, the additional emission peak obeyed the Varshni equation with temperature and exhibited the band-filling effect at high excitation power. This new emission peak may be attributed to spatially indirect exciton recombination between different crystalline phases of CdS. First-principles calculations were performed based on the spatially indirect exciton recombination, and the calculated and experimental results agreed with one another. Strain proved to be capable of enhancing the anti-Stokes emission, suggesting that the efficiency of laser cooling may be improved by strain engineering.

关键词： strain,CdS nanobelts,photoluminescence,spatially indirect excitonrecombination,inter-crystalline phasetransition