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Utilizing graphene oxide/gold/methylene blue ternary nanocomposite as a visible light photocatalyst for a plasmon-enhanced singlet oxygen generation

Tamtaji, M ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1007/s11144-022-02271-1
  3. Publisher: Springer Science and Business Media B.V , 2022
  4. Abstract:
  5. In this study, graphene oxide/gold/methylene blue (GO/Au/MB) ternary composites were synthesized and characterized through UV–vis, FTIR, XRD, XPS, SEM, and TEM analyses towards plasmon-enhanced singlet oxygen (1O2) generation. Through using gold nanoparticles and MB photosensitizers, the visible light adsorption capability of GO was enhanced by 115%. Moreover, applying this ternary composite as a photocatalyst under visible light interestingly revealed a drastic step-increase of 14% (i.e., from 9 to 23%) in the conversion of photooxygenation of Anthracene. This behavior was rationalized using finite-difference time-domain (FDTD) simulations which confirms the plasmonic field of gold nanoparticles with a diameter of 16 nm obtained from TEM. Time-dependent density functional theory (TD-DFT) calculations suggest that the presence of an electric field can favor the intersystem crossing of methylene blue to enhance 1O2 generation. Graphical abstract: [Figure not available: see fulltext.] © 2022, Akadémiai Kiadó, Budapest, Hungary
  6. Keywords:
  7. FDTD ; TD-DFT ; Aromatic compounds ; Density functional theory ; Electric fields ; Fiber optic sensors ; Finite difference time domain method ; Gas generators ; Graphene ; Light ; Metal nanoparticles ; Oxygen ; Photosensitizers ; Plasmonic nanoparticles ; Plasmonics ; Finite difference time domains ; Gold nanoparticle ; Graphene oxides ; Interspace distancing ; Methylene Blue ; Plasmonic nanoparticle ; Singlet oxygen ; Ternary composites ; Time dependent density functional theory ; Gold nanoparticles
  8. Source: Reaction Kinetics, Mechanisms and Catalysis ; Volume 135, Issue 5 , 2022 , Pages 2851-2865 ; 18785190 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11144-022-02271-1