Hole scavenging and electron-hole pair production rate: two mandatory key factors to control single-tip Au-CdSe/CdS nanoheterodimers growth by photodeposition - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Nano Année : 2021

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

Résumé

Metal/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.

Domaines

Matériaux
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Dates et versions

hal-03355179 , version 1 (27-09-2021)

Identifiants

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Junjie Hao, Haochen Liu, Kai Wang, Xiao Wei Sun, Jean-Pierre Delville, et al.. Hole scavenging and electron-hole pair production rate: two mandatory key factors to control single-tip Au-CdSe/CdS nanoheterodimers growth by photodeposition. ACS Nano, 2021, 15 (9), pp.15328-15341. ⟨10.1021/acsnano.1c06383⟩. ⟨hal-03355179⟩
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