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Shape-Controlled photochemical synthesis of noble metal nanocrystals based on reduced graphene oxide

Liu, Y ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1021/acsami.2c01209
  3. Publisher: American Chemical Society , 2022
  4. Abstract:
  5. The fabrication of supported noble metal nanocrystals (NCs) with well-controlled morphologies have been attracted considerable interests due to their merits in a wide variety of applications. Photodeposition is a facile and effective method to load metals over semiconductors in a simple slurry reactor under irradiation. By optimizing the photodeposition process, the size, chemical states, and the geometrical distribution of metal NCs have been successfully tuned. However, metal NCs with well-controlled shapes through the photodeposition process have not been reported until now. Here, we report our important advances in the controlled photodeposition process to load regular noble metal NCs. Reduced graphene oxide (rGO) is introduced as a reservoir for the fast transfer of photoelectrons to avoid the fast accumulation of photogenerated electrons on the noble metals which makes the growth process uncontrollable. Meanwhile, rGO also provides stable surface for the controlled nucleation and oriented growth. Noble metal NCs with regular morphologies are then evenly deposited on rGO. This strategy has been demonstrated feasible for different precious metals (Pd, Au, and Pt) and semiconductors (TiO2, ZnO, ZrO2, CeO2, and g-C3N4). In the prototype application of electrochemical hydrogen evolution reaction, regular Pd NCs with enclosed {111} facets showed much better performance compared with that of irregular Pd NCs. © 2022 American Chemical Society. All rights reserved
  6. Keywords:
  7. Noble metal nanocrystals ; Photodeposition ; Reduced graphene oxide ; Semiconductors ; Cerium oxide ; Graphene ; Magnetic semiconductors ; MOS devices ; Nanocrystals ; Oxide semiconductors ; Palladium ; Process control ; Titanium dioxide ; Wide band gap semiconductors ; Zinc oxide ; Zirconia ; Controlled morphology ; Electron transfer ; Metal nanocrystals ; Noble metal nanocrystal ; Pd nanocrystals ; Photo-deposition ; Photochemical synthesis ; Reduced graphene oxides ; Shape-controlled ; Simple++ ; II-VI semiconductors
  8. Source: ACS Applied Materials and Interfaces ; Volume 14, Issue 14 , 2022 , Pages 16527-16537 ; 19448244 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsami.2c01209