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- W4281713940 abstract "Transition metal dichalcogenides (TMDs) quantum dots (QDs) with defects have attracted interesting chemistry due to contribution of vacancy to their unique optical, physical, catalytic and electrical properties. Engineering defined defects into molybdenum sulfide (MoS2) QDs is challenging. Herein, applying a mild biomineralization assisted bottom-up strategy fabricated blue photoluminescent MoS2 QDs (B-QDs) with a high density of defects. Our two stage synthesis begins with a bottom up synthesis of origin MoS2 QDs (O-QDs) through chemical reactions of Mo and sulfide ions, followed by alkaline etching that created high sulfur vacancy defects to eventually form B-QDs. Alkaline etching significantly increased the photoluminescence (PL) and photo-oxidation. We showed an increase in defect density brought about increased active sites and decreased bandgap energy; further validated with density functional theory calculations. There was strengthened binding affinity between QDs and O2 due to lower gap energy (∆EST) between S1 and T1 accompanied with improved intersystem crossing (ISC) efficiency. Lowered gap energy contributed to assist e−-h+ pair formation and the strengthened binding affinity between QDs and 3O2. Defect engineering unraveled another dimension of material properties control and can bring fresh new applications to otherwise well characterized TMD nanomaterials. This article is protected by copyright. All rights reserved" @default.
- W4281713940 created "2022-06-13" @default.
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- W4281713940 date "2022-07-03" @default.
- W4281713940 modified "2023-10-16" @default.
- W4281713940 title "Defect‐Rich Molybdenum Sulfide Quantum Dots for Amplified Photoluminescence and Photonics‐Driven Reactive Oxygen Species Generation" @default.
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- W4281713940 doi "https://doi.org/10.1002/adma.202200004" @default.
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