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Controlled building of CdSe@ZnS/Au and CdSe@ZnS/ Au2S/Au nanohybrids

Nano Research 2015年第7期8卷 2271-2287页

作者： Raquel E. Galian Pilar Diaz antonio ribera Alejandro Rincon-Bertolin Said Agouram Julia Perez-Prieto Instituto de Ciencia Molecular (ICMol) Universidad de Valencia c/ Catedrdtico Jose Beltran 2 46980 Paterna Valencia Spain Department of Applied Physics and Electromagnetism Dr. Moliner 50 Universidad de Valencia 461 00 Burjassot Valencia Spain

The addition of Au3. to spherical amine-capped CdSe@ZnS nanoparticles in toluene at room temperature and under darkness can lead to ternary CdSe@ZnS/Au nanohybrids. We demonstrate that this happens only when the nanoparticles possess a relatively thin ZnS shell, thus showing that thickness plays a key role in gold deposition on the CdSe@ZnS nanoparticle surface. Our hypothesis is that the amine ligand acts as the reductant of Au3＋ ions into Au＋ ions, whose affinity for sulfur would keep them at the CdSe@ZnS surface. This interaction stabilizes the Au＋ ion, making it less prone to reduction than a non-coordinated Au＋ ion. In CdSe@ZnS with a thin shell, Au＋ ions at the surface of, or most probably within, the ZnS shell cause the transfer of Cd2＋ ions into the solution. Subsequently, the core Se2- anion, which is a better reductant than the shell S2- reduces Au＋ ions to Au（0）, and large gold nanoparticles （AuNPs） are quickly deposited on the CdSe@ZnS surface in room temperature process, leading to ternary CdSe@ZnS/Au nanohybrids. In solution, these ternary nanohybrids progressively transform into quaternary CdSe@ZnS/Au2S/Au nanohybrids due to the reaction of the shell S2- anion with the remaining Au＋ at the CdSe@ZnS surface, thus leading to the growth of Au2S nanoparticles on the CdSe@ZnS surface while Zn concomitantly leaches from the nanohybrid into the solution. Photoirradiation of the heterostructures with visible light enhances their emission efficiency. Comparatively, irradiation of the precursors, i.e., CdSe@ZnS nanoparticles, causes a drastic decrease in their emission accompanied by a blue shift of their emission maximum. The optical properties of these nanohybrids were analyzed by absorption and fluorescence （steady-state and time-resolved） spectroscopy, and the composition of the samples and the chemical states were determined by energy dispersive X-ray spectroscopy （EDX） and X-ray photoelectron spectroscopy （XPS）, respectively. Finally, the structural and m

关键词： heterostructures semiconductor nanoparticle metallic fluorescence time-resolved studies

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Prospective application of a bleeding and ischemic risks-adjusted antithrombotic protocol in elderly patients revascularized with everolimus-eluting stents:EPIC05-Sierra75 study

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Journal of Geriatric Cardiology 2022年第5期19卷 354-366页

作者： Jose M de la Torre Hernandez Ramon Lopez Palop Jesus M Jimenez Mazuecos Pilar Carrillo Sáez Alejandro Gutierez-Barrios Eduardo Pinar Belen Cid Luis Fernandez Tamara Garcia Camarero Cristóbal Urbano-Carrillo Juan F Oteo Dominguez Victor A Jimenez Diaz antonio EGomez Menchero Eladio Galindo Fernández Juan GCórdoba Soriano Raymundo Ocaranza Eduardo ArroyoÚcar Koldobika Garcia San Roman Silvio Leal Ginés Martínez Cáceres Jose A Linares Vicente Georgina Fuertes Ferre Xavier Carrillo Juan CRama Merchán Catia Costa Juan Sanchis Renato Fernandes Alberto Rodrigues Jose M Vegas Valle Hélder Pereira Armando Perez de Prado Cardiology Department Hospital Universitario Marqués de ValdecillaIDIVALSantanderSpain Cardiology Department Hospital Universitario San JuanAlicanteSpain Cardiology Department Complejo Hospitalario Universitario de AlbaceteAlbaceteSpain Cardiology Department Hospital Universitario Puerta del MarCadizSpain Cardiology Department Hospital Clínico Universitario Virgen de la ArrixacaMurciaSpain Cardiology Department Hospital Clinico Universitario de SantiagoCIBERCVSantiago de CompostelaSpain Cardiology Department Hospital Universitario de CrucesBilbaoSpain Cardiology Department Hospital Regional Universitario de MálagaMalagaSpain Cardiology Department Hospital Universitario Puerta de HierroMadridSpain Cardiology Department Hospital Alvaro CunqueiroVigoSpain Cardiology Department Hospital Juan Ramon JimenezHuelvaSpain Cardiology Department Hospital Universitario de BadajozBadajozSpain Cardiology Department Hospital Universitario Lucus AugustiLugoSpain Cardiology Department Hospital de Torrevieja/VinalopóRibera SaludTorreviejaSpain Cardiology Department Hospital Santa CruzLisboaPortugal Cardiology Department Hospital Clínico Universitario Lozano BlesaZaragozaSpain Cardiology Department Hospital Universitario Miguel ServetZaragozaSpain Cardiology Department Hospital Germans Trias i PujolBadalonaSpain Cardiology Department Hospital de MeridaMeridaSpain Cardiology Department Hospital São BernardoSetúbalPortugal Cardiology Department Hospital Clinico Universitario de ValenciaUniversidad de ValenciaCIBERCVValenciaSpain Cardiology Department Hospital do Espirito SantoEvoraPortugal Cardiology Department Centro Hospitalar de Vilanova de GaiaVilanova de GaiaPortugal Cardiology Department Hospital de CabueñesGijonSpain Cardiology Department Hospital Garcia de OrtaAlmadaPortugal Cardiology Department Complejo Asistencial Universitario de LeónLeonSpain

OBJECTIVES Elderly patients show a higher incidence of ischemic and bleeding events after percutaneous transluminal coron-ary intervention(PCI).We sought to investigate outcomes in elderly patients treated with antithrombotic strategy guided by bleeding and ischemic risks after revascularization with last generation everolimus-eluting stent(EES).METHODS Prospective multicenter registry including patients over 75 years revascularized with EES and antithrombotic ther-apy guided by clinical presentation,PCI complexity and PRECISE DAPT ***-primary safety endpoints were:(1)composite of cardiac death,myocardial infarction and stent thrombosis and;(2)bleeding(BARC 2-5).Primary efficacy endpoint was target lesion revascularization.A matched group of patients revascularized with current drug-eluting stents and no such tailored antith-rombotic therapy was used as *** Finally,1064 patients were included in SIERRA-75 cohort,80.8±4.2 years,36.6%women,71%acute coronary syn-dromes(ACS)and 53.6%complex ***-primary safety endpoint of major adverse cardiovascular events was met in 6.2%,co-primary safety endpoint of bleeding in 7.8%and primary efficacy endpoint of TKLR in 1.5%.The multivariable adjusted model showed no significant association of the prescribed short/long dual antiplatelet therapy(DAPT)durations with any endpoint suggesting a well tailored *** stent thrombosis reported in the subgroup with 1-3 months DAPT *** compared to control group,bleeding BARC 2-5 was significantly lower in SIERRA-75 group(7.4%vs.10.2%,P=0.04)as well as the net safety-efficacy endpoint(14.3%vs.18.5%,P=0.02).CONCLUSIONS In elderly population,the application of this risks-adjusted antithrombotic protocol after revascularization with last generation EES seems to be associated with an improved prognosis in terms of ischemic and bleeding outcomes.

关键词： patients bleeding antithrombotic

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