Time-dependent emission stokes shift in Au, Ag and Au/Ag fluorescent nanoclusters: evidence of multiple emissive states

被引：6

作者：

Basu, Nabaruna ^{[1
]}

Mandal, Debabrata ^{[1
]}

机构：

[1] Univ Calcutta, Dept Chem, 92 APC Rd, Kolkata 700009, India

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2019年 / 18卷 / 07期

关键词：

ULTRAFAST RELAXATION DYNAMICS; GOLD NANOCLUSTERS; GLUTATHIONE; CLUSTERS; SIZE; IDENTIFICATION; NANOPARTICLE; LUMINESCENT; THIOLATE;

D O I：

10.1039/c8pp00540k

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Au, Ag and bimetallic Au/Ag nanoclusters were prepared under similar microwave-irradiated synthesis conditions in aqueous solutions, using BSA as a stabilizer. The nanoclusters exhibited strong fluorescence with characteristic emission spectral peak features that suggested the presence of multiple emissive states in each case. Time-resolved emission studies revealed the very rare incidence of the time-dependent emission Stokes shift in metal nanoclusters over a time-scale of similar to 10 ns. The shifts were of varying degrees: similar to 200 cm(-1) for Ag, similar to 750 cm(-1) for Au and similar to 1400 cm(-1) for Au/Ag nanoclusters. Application of the Time-Resolved Area Normalized Emission Spectra (TRANES) method confirmed the existence of multiple emissive species in each of the nanoclusters, which also helped to explain the time-dependent emission Stokes shift.

引用

页码：1782 / 1792

页数：11

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