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

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

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Catalysts for the hydrogen evolution reaction in alkaline medium:Configuring a cooperative mechanism at the Ag-Ag_(2)S-MoS_(2) interface

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Journal of Energy Chemistry 2022年第11期31卷 481-488,I0013页

作者： Avraham Bar-Hen Simon Hettler Ashwin Ramasubramaniam Raul Arenal Ronen Bar-Ziv Maya Bar Sadan department of Chemistry Ben-Gurion University of the NegevBeer-Sheva 8410501Israel department of Chemistry Nuclear Research Center NegevP.O.Box 9001Beer-Sheva 84190Israel Laboratorio de Microscopías Avanzadas Universidad de Zaragoza50018 ZaragozaSpain instituto de nanociencia y Materiales de aragon CSIC-U.de ZaragozaCalle Pedro Cerbuna 1250009 ZaragozaSpain department of Mechanical and Industrial Engineering University of MassachusettsAmherstMA 01003United States ARAID Foundation 50018 ZaragozaSpain

designing electrocatalysts for HER in alkaline conditions to overcome the sluggish kinetics associated with the additional water dissociation step is a recognized challenge in promoting the hydrogen *** this end,delicately tuning the atomic-scale structure and surface composition of nanoparticles is a common strategy and,specifically,making use of hybrid structures,can produce synergistic effects that lead to highly active ***,we present a core-shell catalyst of Ag@MoS_(2)that shows promising results towards the hydrogen evolution reaction(HER)in both 0.5 M H_(2)SO_(4)and 0.5 M *** this hybrid structure,the MoS_(2)shell is strained and defective,and charge transfer occurs between the conductive core and the shell,contributing to the electrocatalytic *** shelling process results in a large fraction of Ag_(2)S in the cores,and adjusting the relative fractions of Ag,Ag_(2)S,and MoS_(2)leads to improved catalytic activity and fast charge-transfer *** suggest that the enhancement of alkaline HER is associated with a cooperative effect of the interfaces,where the Ag(Ⅰ)sites in Ag_(2)S drive the water dissociation step,and the formed hydrogen subsequently recombines on the defective MoS_(2)*** study demonstrates the benefits of hybrid structures as functional nanomaterials and provides a scheme to activate MoS_(2)for HER in alkaline conditions.

关键词： Water splitting Core-shell Catalytic mechanism Electrocatalysis 2D materials

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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

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Synthesis of (B-C-N) Nanomaterials by Arc Discharge Using Heterogeneous Anodes

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Plasma Science and Technology 2016年第5期18卷 465-468页

作者： Djamel Eddine GOURARI Manitra RAZAFINIMANANA Marc MONTHIOUX Raul ARENAL Flavien VALENSI Sebastien JOULIE Virginie SERIN LAPLACE (Laboratoire Plasma et Conversion d'Energie) CNRS-INPT-Universite Toulouse III 118 Route de Narbonne 31062 Toulouse Cedex 9 France CEMES (Centre d'Elaboration des Materiaux et d'Etudes Structurales) CNRS-Universite Toulouse III 29 rue Jeanne Marvig F-31055 Toulouse Cedex 4 France instituto de nanociencia de aragon (INA) Universidad de Zaragoza Calle Mariano Esquillor 50018 Zaragoza Spain

In spite of the current prevalence of the CVD-based processes, the electric arc remains an interesting process for the synthesis of carbon nanoforms, thanks to its versatility, robustness and easiness. It also allows performing in-situ substitution of carbon atoms by hetero-elements in the graphene lattice. Our work aims to establish a correlation between the plasma properties, type and chemical composition （and the substitution rate） of the obtained single-wall carbon nan- otubes. The plasma was characterized by optical emission spectroscopy and the products were analyzed by high resolution transmission electron microscopy and core level Electron Energy-Loss Spectroscopy （EELS）. Results show that a high boron content leads to a plasma temperature decrease and hinders the formation of nanotubes. This effect can be compensated by increasing the arc current and/or yttrium content. The optimal conditions for the synthesis of boron- and/or nitrogen-substituted nanotubes correspond to a high axial plasma temperature associated to a strong radial gradient. EELS analysis confirmed that the boron incorporates into the graphenic lattice.

关键词： arc discharge plasma nanomaterials synthesis optical spectroscopy boronnitride doped carbon nanotubes HRTEM EELS

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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 rhombohedral- structured Bi2Te3 nanoplates. The epitaxial relationship between Te and Bi2T% 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： Te nucleation seed epitaxial growth Bi2Te3 few-quintuple layer TEM cross-section optical contrast

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Gold nanoprisms as a hybrid in vivo cancer theranostic platform for in situ photoacoustic imaging, angiography, and localized hyperthermia

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Nano Research 2016年第4期9卷 1043-1056页

作者： Chenchen Bao Joao Conde Fei Pan Chao Li Chunlei Zhang Furong Tian Shujing Liang Jesus M. de la Fuente Daxiang Cui Institute of Nano Biomedicine and Engineering Department of Instrument Science and Engineering School of Electronic Information and Electrical Engineering National Center for TranslationaI Medicine Collaborative Innovational Center for System Biology Shanghai Jiao Tong University Shanghai200240 China Massachusetts Institute of Technology Institute for Medical Engineering and Science Harvard-MIT Division for Health Sciences and Technology E25-449 Cambridge Massachusetts USA School of Engineering and Materials Science Queen Mary University of London E14N5 London UK School of Food Science and Environmental Health College of Science and Health Dublin Institute of Technology Camden Row 4 Dublin Ireland instituto de nanociencia de aragon (INA) Universidad de Zaragoza Zaragoza 50018 Spain

The development of high-resolution nanosized photoacoustic contrast agents is an exciting yet challenging technological advance. Herein, antibody （breast cancer-associated antigen I （Brcaal） monoclonal antibody）- and peptide （RGD）- functionalized gold nanoprisms （AuNprs） were used as a combinatorial methodology for in situ photoacoustic imaging, angiography, and localized hyperthermia using orthotopic and subcutaneous murine gastric carcinoma models. RGD-conjugated PEGylated AuNprs are available for tumor angiography, and Brcaal monodonal antibody-conjugated PEGylated AuNprs are used for targeting and for in situ imaging of gastric carcinoma in orthotopic tumor models. In situ photoacoustic imaging allowed for anatomical and functional imaging at the tumor site. In vivo tumor angiography imaging showed enhancement of the photoacoustic signal in a time-dependent manner. Furthermore, photoacoustic imaging demonstrated that tumor vessels were clearly damaged after localized hyperthermia. This is the first proof-of-concept using two AuNprs probes as highly sensitive contrasts and therapeutic agents for in situ tumor detection and inhibition. These smart antibody/peptide AuNprs can be used as an efficient nanotheranostic platform for in vivo tumor detection with high sensitivity, as well as for tumor targeting therapy which, with a single-dose injection, results in tumor size reduction and increases mice survival after localized hyperthermia treatment.

关键词： gold nanoprisms in situ gastric cancer photoacoustic imaging photothermal therapy

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Dual-targeted lung cancer therapy via inhalation delivery of UCNP-siRNA-AS1411 nanocages

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Cancer Biology & Medicine 2022年第7期19卷 1047-1060页

作者： Yu Han Yuming Yang Qiuyang Sun Bin Li Caixia Yue Yanlei Liu Jesús M.de la Fuente Daxiang Cui Institute of Nano Biomedicine and Engineering Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of EducationShanghai Engineering Research Center for Intelligent Diagnosis and Treatment InstrumentDepartment of Instrument Science&EngineeringSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Center for Nanotechnology Collaborative Innovational Center for System BiologyShanghai 200241China department of Neurosurgery Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200092China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China instituto de nanociencia de aragon(INA) Universidad de ZaragozaZaragoza 50018Spain

Objective:Although great progress has been made in the field of siRNA gene therapy,safe,efficient,and targeted delivery of siRNA are still major challenges in siRNA ***:We developed an up-conversion nanoparticle-based nanocage *** system protected the siRNA from being degraded by nucleases in organisms and selectively delivered the siRNAs to the tumor sites,due to modifications of targeted molecules on the surfaces of nanocages and local ***:The siRNAs delivered by the up-conversion nanoparticle nanocages were protected from degradation in transit to the tumor sites,where they *** with the passive target and control groups,the up-conversion nanoparticles based on the nanocage system showed a tumor suppressive effect after approximately 3 weeks of ***:The up-conversion nanoparticle nanocages efficiently delivered vascular endothelial growth factor siRNAs to tumor *** with lung tumors treated with tumors targeting up-conversion nanoparticle nanocages showed steady body weight changes,high tumor inhibition ratios,and longer survival times.

关键词： Nanomaterials VEGF siRNA lung cancer gene therapy siRNA delivery

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