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Photoluminescence monitoring of oxide formation and surface state passivation on InAs quantum dots exposed to water vapor

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Nano Research 2016年第10期9卷 3018-3026页

作者： Giovanna Trevisi Luca Seravalli Paola Frigeri cnr-IMEM Institute Parco Area delle Scienze 37a 43124 Parma Italy

The room-temperature light emission of uncapped III-V semiconductor quantum dots is used to investigate the properties and evolution of the surface under exposure to a humid environment. Enhanced photoluminescence intensity resulting from exposure to polar molecules has already been reported; here we demonstrate that the external environment also has a relevant effect on the emission energy of quantum dots. Experimental results are interpreted on the basis of a model of the quantum system that takes into account the formation of oxide on pristine III-V surfaces and the presence of surface states. As a result of our study, we can clearly distinguish the effect of surface oxidation from that of surface state passivation on the emission of InAs surface quantum dots. This work sheds new light on the properties of semiconductor surface quantum dots as building blocks of novel and highly efficient sensing devices based on optical transduction.

关键词： epitaxial quantum dots surface states oxide photoluminescence quantum modeling optical nanosensor

Modulation of the magnetic properties of gold-spinel ferrite heterostructured nanocrystals

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Nano Research 2020年第3期13卷 785-794页

作者： Elvira Fantechi Claudia Innocenti Giovanni Bertoni Claudio Sangregorio Francesco Pineider INSTM and Dept of Chemistry and Industrial ChemistryUniversity of PisaPisa 56124Italy ICCOM-cnr Institute for the Chemistry of OrganoMetallic CompoundsSesto Fiorentino 50019Italy INSTM and Dept of Chemistry aU.Schiffnt University of FlorenceSesto Fiorentino 50019Italy IMEM-cnr Institute of Materials for Electronics and MagnetismParma 43124Italy cnr-Istituto Nanoscienze Modena 41125Italy

The rational design of complex nanostructures is of paramount importance to gain control over their chemical and physical ***,magnetic-plasmonic heterostructured nanocrystals have been recognized as key players in nanomedicine as multifunctional therapeutic-diagnostic tools and in *** we show how the properties of gold-iron oxide heterostructured nanocrystals can be tuned by chemical doping of the magnetic *** divalent cations in the iron oxide were substituted with cobalt and manganese to obtain a general formula Au-MFe2O4(M=Fe,Co,Mn).Magnetic properties of the heterostructures could be tuned,while maintaining well-defined plasmon resonance signatures,confirming the dual magnetic-plasmonic functional capability of these nanostructures.

关键词： heterostructured nanocrystals seeded-growth spinel ferrites magnetic-plasmonic nanoparticles

Ethylene-Propene Copolymerization with C1-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass

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Chinese Journal of Polymer Science 2020年第3期38卷 220-230,I0005页

作者： Simona Losio Laura Boggioni Massimiliano Cornelio Abbas Razavi Incoronata Tritto cnr–Istituto di Scienze e Tecnologie Chimiche"G.Natta"(cnr-SCITEC) via Alfonso Corti 12-20133 MilanoItaly Total Petrochemicals Research Zone Industrielle CB-7181 FeluyBelgium

Ethylene-propene copolymers have been synthesized by three C1-symmetric metallocene molecules(1,2,and 3),having tert-butyl substituents on the Cp moiety,on the fluorenyl moiety,or on both moieties,and methylaluminoxane(MAO)at different polymerization temperatures and monomer *** were investigated by 13 C-NMR,1 H-NMR,and SEC analyses.A relationship was found between[EEE]/[E]ratios and copolymer molar masses in each series:the higher the[EEE]/[E]ratio,the lower the copolymer molar *** parity of[EEE]/[E]ratio,copolymer molar mass follows the order 1>>3>*** end group analysis reveals that copolymers mainly terminate when propene is the last inserted unit,confirming that it is the greater facility of Mt-P-E-poly(E-co-P)to terminate that influences the copolymer molar *** the catalysts considered,catalyst 1,which gives syndiospecific polypropene,gives greater activities,comonomer incorporation,and molar *** 3,which gives isospecific polypropene,in copolymerization performs better than 2,having the same bridge,with respect to activities,ethylene content,and molar *** good performance of this catalyst arises from the not necessity of polymer chain to back skip when ethylene is the last inserted unit.

关键词： Ethylene-propene Metallocene catalysts Copolymers Microstructure Molar masses

Aggressive therapy with statins in elderly and malnourished patients with acute myocardial infarction： is the right time to change？

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Journal of Geriatric Cardiology 2016年第10期13卷 815-816页

作者： Annamaria Mazzone Umberto Paradossi Sergio Berti Giuseppina Basta Fondazione G. Monasterio cnr Regione Toscana Pisa Massa Italy cnr Institute of Clinical Physiology Via G. Moruzzi Pisa Italy

The changes in the demographic profile of the population with longer life expectancy are mainly due to an improvement of lifestyle, prevention and care of chronic diseases, such as cardiovascular disease.

关键词： Acute myocardial infarction Elderly Malnutrition Statin

How physical and motor training affect cognitive performance: lessons from an inflammatory molecule

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Neural Regeneration Research 2022年第12期17卷 2689-2690页

作者： Margherita Maffei Marco Mainardi Institute of Clinical Physiology National Research Council(IFC-CNR)and Obesity/Lipodystrophies CenterPisa University HospitalPisaItaly Neuroscience Institute National Research Council(IN-CNR)PisaItaly

Our phenotype includes not only physical features,but also behavioral outputs such as motor schemes and learned skills,and is the result of a complex interaction between genetic background and *** fact,a good fraction of last decades’biomedical efforts were dedicated to understanding how different elements(e.g.,genetic polymorphisms,lifestyle components)participate in this interplay,ultimately contributing to affect a given phenotype up to the point of steering it towards *** and epigenetic elements are relatively easy to analyze individually using a reductionist approach,for instance via loss-or gain-of-function studies in cellular and animal models;the effects of nutrients,drugs,pollutants can be similarly tested as single specific stimuli.

关键词： instance drugs lesson

Surface functionalization of acrylic based photocrosslinkable resin for 3D printing applications

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Bioactive Materials 2017年第3期2卷 131-137页

作者： A.Ronca F.Maiullari M.Milan V.Pace A.Gloria R.Rizzi R.De Santis L.Ambrosio Institute of Polymers Composites and Biomaterials e National Research Council(IPCB-CNR)Italy Institute of Cellular Biology and Neurobiology e National Research Council(IBCN-cnr) Italy

The limited number of resins,available for stereolithography applications,is one of the key drivers in research applied to rapid *** this work an acrylic photocrosslinkable resin based on methyl methacrylate(MMA),butyl methacrylate(BMA)and poly(ethylene glycol)dimethacrylate(PEGDA)was developed with different composition and characterized in terms of mechanical,thermal and biological *** different systems have been developed using different amount of *** influence of every components have been evaluated on the final characteristic of the resin in order to optimize the final composition for applications in bone tissue *** crosslinked materials showed good mechanical properties and thermal stabilities and moreover cytotoxicity test confirms good biocompatibility with no cytotoxic effect on cells *** two different treatments have been proposed,using fetal bovine serum(FBS)and methanol(MeOH),in order to improve cell recognition of the *** threatened with MeOH allow cell adhesion and survival,promoting spreading,elongation and fusion of C2C12 muscle myoblast cells.

关键词： resin acrylic methacrylate

Contactless Monitoring of the Diameter-Dependent Conductivity of GaAs Nanowires

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Nano Research 2010年第10期3卷 706-713页

作者： Fauzia Jabeen Silvia Rubini Faustino Martelli Alfonso Franciosi Andrei Kolmakov Luca Gregoratti Matteo Amati Alexei Barinov Andrea Goldoni Maya Kiskinova Sincrotrone Trieste S.C.P.A. Elettra LaboratoryArea Science ParkS.S.14Km.163.5I-34149 TriesteItaly Laboratorio TASC iom-cnr Area Science ParkS.S.14Km.163.5I-34149 TriesteItaly Department of Physics Southern Illinois University Carbondale1245 Lincoln Dr.Neckers 478CarbondaleIL 62901-4401USA

Contactless monitoring with photoelectron microspectroscopy of the surface potential along individual nano-structures,created by the X-ray nanoprobe,opens exciting possibilities to examine quantitatively size-and surface-chemistry-effects on the electrical transport of semiconductor nanowires(NWs).Implementing this novel approach-which combines surface chemical microanalysis with conductivity measurements-we explored the dependence of the electrical properties of undoped GaAs NWs on the NW width,temperature and surface *** following the evolution of the Ga 3d and As 3d core level spectra,we measured the position-dependent surface potential along the GaAs NWs as a function of NW diameter,decreasing from 120 to~20 nm,and correlated the observed decrease of the conductivity with the monotonic reduction in the NW diameter from 120 to~20 *** of the GaAs NWs to oxygen ambient leads to a decrease in their conductivity by up to a factor of 10,attributed to the significant decrease in the carrier density associated with the formation of an oxide shell.

关键词： Semiconductor nanowires charge transport surface oxidation photoelectron X-ray microscopy charging GaAs

Microglia-oligodendrocyte intercellular communication: role of extracellular vesicle lipids in functional signalling

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Neural Regeneration Research 2021年第6期16卷 1194-1195页

作者： Alice Gualerzi Marta Lombardi Claudia Verderio IRCCS Fondazione Don Carlo Gnocchi MilanItaly cnr Institute of Neuroscience MilanItaly

The term microglia refers to the group of resident brain immune-cells that are responsible,mainly,for the immune response and the homeostasis of the *** monocyte-derived macrophages that infiltrate the brain,microglia are longlived cells which arise exclusively from the embryonic yolk sac(Stratoulias et al.,2019).Impairment in microglia functions is at the basis for the development of multiple brain diseases,including multiple sclerosis and neurodegenerative *** the last decade,the number of research articles and reviews dealing with the role of microglia in the pathogenesis of brain disorders has exponentially increased.

关键词： al. homeostasis diseases

3D floor plan recovery from overlapping spherical images

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Computational Visual Media 2018年第4期4卷 367-383页

作者： Giovanni Pintore Fabio Ganovelli Ruggero Pintus Roberto Scopigno Enrico Gobbetti CRS4 Visual Computing Group cnr-ISTI Visual Computing Group

We present a novel approach to automatically recover, from a small set of partially overlapping spherical images, an indoor structure representation in terms of a 3D floor plan registered with a set of 3D environment maps. We introduce several improvements over previous approaches based on color and spatial reasoning exploiting Manhattan world priors. In particular, we introduce a new method for geometric context extraction based on a 3D facet representation,which combines color distribution analysis of individual images with sparse multi-view clues. We also introduce an efficient method to combine the facets from different viewpoints in a single consistent model, taking into the reliability of the facet information. The resulting capture and reconstruction pipeline automatically generates 3D multi-room environments in cases where most previous approaches fail, e.g., in the presence of hidden corners and large clutter, without the need for additional dense 3D data or tools. We demonstrate the effectiveness and performance of our approach on different real-world indoor scenes. Our test data is available to allow further studies and comparisons.

关键词： indoor reconstruction spherical panoramic cameras 360 degree photography multi-room environments