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

Autor: Hao, Junjie, Liu, Haochen, Wang, Kai, Sun, Xiao, Delville, Jean-Pierre, Delville, Marie-Hélène
Přispěvatelé: Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Department of Electrical and Electronic Engineering, Southern University of Science and Technology [Shenzhen] (SUSTech), This project has received financial support from the CNRS through the MITI interdisciplinary programs (Action MITI: Nouveaux Matériaux 2020 and 2021), the Ministry of Science and Technology of China (Nos. 2016YFB0401702 and 2017YFE0120400), National Natural Science Foundation of China (Nos. 61875082, 61405089, and 62005115), Key-Area Research and Development Program of Guangdong Province (Nos. 2019B010925001, 2019B010924001), Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting (No. ZDSYS201707281632549).
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: ACS Nano
ACS Nano, American Chemical Society, 2021, 15 (9), pp.15328-15341. ⟨10.1021/acsnano.1c06383⟩
ISSN: 1936-0851
DOI: 10.1021/acsnano.1c06383⟩
Popis: International audience; 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.
Databáze: OpenAIRE
Externí odkaz: