Journal
NANO RESEARCH
Volume 13, Issue 6, Pages 1668-1676Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2790-0
Keywords
doped nanocrystals; energy transfer; photocatalysis; singlet oxygen; selective oxidation
Categories
Funding
- ACS-PRF [59861-DNI5]
- NSF CHE MSN [05539CON04700]
- Syracuse University
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Transition-metal ions doped nanocrystals (NCs), specifically Mn-doped NCs, hold great potential in the field of photocatalysis, especially, to improve photocatalytic performance for singlet oxygen (O-1(2)) generation. Here, we report the design of a novel Mn-doped NC-based nanocomposites, specifically, silica-coated Mn-doped CdS/ZnS NCs decorated with Pt NCs (denoted as Mn-NCs@SiO2-Pt), which enhance photocatalytic O-1(2) generation. Owing to the long-lived Mn excited state (on the order of ms), the energy-transfer between Mn-NCs and molecular oxygen is facilitated with the assistance of the Pt NCs adhered to the Mn-NC@SiO2 surface. Therefore, the Mn-NCs@SiO2-Pt composites, integrate the advantages of Mn-doped NCs, a protective silica layer, and Pt NCs to exhibit excellent catalytic activity and selectivity for the selective oxidation of primary benzylic alcohols to aldehydes through an O-1(2) engaged oxidation process under visible-light irradiation. This work paves the way for enhancing catalytic performance via facilitated energy transfer relaxation by utilizing the long-lived excited-state of Mn2+ dopant ions in nanocomposites.
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