title: The enhancement of electron-phonon coupling in glutathione-protected Au25 clusters.
abstract: Glutathione-protected Au25 clusters (Au25@GSH) are prospective for biological applications due to their biocompatibility and near infrared fluorescence. The weak electron-phonon coupling, however, restricts their applications in bioanalysis and therapeutics. Here we modify the properties of Au25@GSH by changing their ligands. The temperature dependent fluorescence shows that conjugation with different ligands results in modified temperature behavior. In particular, Au25@GSH-MPA evidently exhibits enhanced phonon coupling, therefore, resulting in a decrease in the emission energy and an increase in bandwidth upon increasing temperatures. The enhanced phonon coupling in modified Au25@GSH sheds new light on the future application of nanoclusters from early diagnosis towards therapeutics.
authors.affiliation: Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan, China.
authors.forename: Yon-Rui
authors.initials: YR
authors.lastname: Toh
authors.forename: Pyng
authors.initials: P
authors.lastname: Yu
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wen
authors.forename: Jau
authors.initials: J
authors.lastname: Tang
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D004583:Electrons; D005453:Fluorescence; D005978:Glutathione / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D060739:Phonons
chemical_list: D001672:Biocompatible Materials; D006046:Gold; D005978:Glutathione