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َAbdolraouf Samadi-Maybodi

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Chemistry
Address:
Phone: 011-35302396

Research

Title
Enhanced photocatalytic activity in the reverse type-I QD through the shelloriented cascadal charge transfer
Type
JournalPaper
Keywords
Inverse ZnS@CdS type-I QDs Band-structure engineering Enhanced solar conversion efficiency Photocatalysis
Year
2018
Journal Journal of Photochemistry and Photobiology A: Chemistry
DOI
Researchers َAbdolraouf Samadi-Maybodi ، Mohammad Reza Shariati

Abstract

Here, we demonstrate an inverse gradient flow of the potential energy at the core/shell interface in ZnS@CdS QD offering higher solar conversion efficiency. The developed band lineup extracts the photogenerated charges into the nanohybrid surface (shell) via a cascadal way along the gradient and hence rises the charge migration quantum efficiency, which leads to the superior photocatalytic efficiency for photoredox reactions over the hybrid photocatalyst. In order to confirm bandgap engineering and exciton delocalization, we exploited steadystate and time-dependent emission and absorption methodologies in the presence and absence of electron/hole quenchers. The suppression of emission intensities together with the decline of the lifetimes verified the crucial role of shell on the migration of energetic electron/hole pairs from the core to the catalyst surface. Besides, surveys of the photocatalytic properties of the as-prepared photocatalysts and kinetic investigation of the reactions were accomplished under solar light irradiation, without using sacrificial agents. The role of reactive oxygen species to photocatalysis reactions revealed via the luminol luminescence and photoluminescence of terephthalic acid. Probable mechanisms of decomposition of organic dyes including direct photo-reduction and/ or -oxidation, reactive oxygen or free radicals species creation and the photosensitization degradation pathways, based on inverse ZnS@CdS type-I QDs were discussed, too.