Journal
JOURNAL OF LUMINESCENCE
Volume 180, Issue -, Pages 315-320Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2016.08.059
Keywords
Singlet-oxygen generation; Thiolate-protected gold nanocluster; Glutathione; Bovine serum albumin; Thiolate ligand; Photosensitizer
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Funding
- JSPS KAKENHI [15H03520, 15H03526, 26505011, 26107719]
- Hitachi Metals Materials Science Foundation
- Nanotechnology Platform Program (Molecule and Material Synthesis) of the MEXT Supported Program for the Strategic Research Foundation at Private Universities, Japan
- Grants-in-Aid for Scientific Research [15H03520, 26505011] Funding Source: KAKEN
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Thiolate-protected Au-25 nanoclusters (NCs) have been shown to be efficient O-1(2) photosensitizers. The O-1(2)-generation efficiency of thiolate-protected Au NCs is expected to depend on the thiolate ligand species and size of the gold clusters. In the present study, Au25(glutathione)18 nanoclusters (Au-25(SG)(18) NCs) and bovine-serum-albumin (BSA)-protected Au-25 nanoclusters (BSA-Au-25 NCs) were synthesized to investigate the effect of different thiolate ligands on the O-1(2) generation. The efficiency of O-1(2) generation by the Au-25 NCs that were photo-excited at 532 nm was evaluated with methotrexate as a chemical probe. The effect of Au NC size on the O-1(2)-generation efficiency of thiolate-protected Au-18 and Au-25 NCs was also investigated. The O-1(2)-generation efficiency of BSA-Au25 NCs was higher than that of Au-25(SG)(18) NCs. The long lifetime of the electronic excitations and the high-photo-stability were key factors facilitating the formation of O-1(2) in BSA-Au-25 NCs. The effect of Au NC size on the O-1(2)-generation efficiency of thiolate-protected Au NCs, Au-n(SR)(m), decreased in the following order: Au-25(SR)(18) > Au-18(SR)(14). (C) 2016 Elsevier B.V. All rights reserved.
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