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Hole scavenging and electron-hole pair production rate: two mandatory key factors to control single-tip Au-CdSe/CdS nanoheterodimers growth by photodeposition

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorHAO, Junjie
hal.structure.identifierDepartment of Electrical and Electronic Engineering
dc.contributor.authorLIU, Haochen
hal.structure.identifierDepartment of Electrical and Electronic Engineering
dc.contributor.authorWANG, Kai
hal.structure.identifierDepartment of Electrical and Electronic Engineering
dc.contributor.authorSUN, Xiao
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorDELVILLE, Jean-Pierre
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELVILLE, Marie-Hélène
dc.date.issued2021
dc.identifier.issn1936-0851
dc.description.abstractEnMetal/semiconductor hetero-nanostructures are now considered as benchmark functional nanomaterials for many light-driven applications. Using laser-driven photodeposition to control growth of gold nanodots (NDs) onto CdSe/CdS dot-in-rods (DRs), we show that the addition of a dedicated hole scavenger (MeOH) is the cornerstone to significantly reduce to less than 3.5% the multiple-site nucleation and 2.5% the rate of gold-free DRs. This means, from a synthetic point of view, that rates up to 90% of single-tip DRs can be reproducibly achieved. Moreover, by systematically varying this hole scavenger concentration and the Au/DRs ratio on the one hand, and the irradiation intensity and the time exposure on the other hand, we explain how gold deposition switches from multisite to single-tipped and how the growth and final size of the single photodeposited ND can be controlled. A model also establishes that the results obtained based on these different varying conditions can be merged onto a single “master behavior” that summarizes and predicts the single-tip gold ND growth onto the CdSe/CdS DRs. We eventually use data from the literature on growth of platinum NDs onto CdS nanorods by laser-deposition to extend our investigation to another metal of major interest and strengthen our modeling of single metallic ND growth onto II–VI semiconducting nanoparticles. This demonstrated strategy can raise a common methodology in the synthesis of single-tip semiconductor–metal hybrid nanoheterodimers (NHDs), leading to advanced nanoparticles architectures for applications in areas as different as photocatalysis, hydrogen production, photovoltaics, and light detection.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enphotodeposition
dc.subject.enlaser
dc.subject.enhetero-nanodimers
dc.subject.enCdSe/CdS
dc.subject.ensingle-tip gold nanodots
dc.subject.enhole scavenger
dc.title.enHole scavenging and electron-hole pair production rate: two mandatory key factors to control single-tip Au-CdSe/CdS nanoheterodimers growth by photodeposition
dc.typeArticle de revue
dc.identifier.doi10.1021/acsnano.1c06383
dc.subject.halChimie/Matériaux
bordeaux.journalACS Nano
bordeaux.page15328–15341
bordeaux.volume15
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-03355179
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03355179v1
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