Unusually large Stokes shift for a near-infrared emitting DNA-stabilized silver nanocluster

被引：41

作者：

Bogh, Sidsel Ammitzboll ^{[1
,2
]}

Carro-Temboury, Miguel R. ^{[1
,2
]}

Cerretani, Cecilia ^{[1
,2
]}

Swasey, Steven M. ^{[3
]}

Copp, Stacy M. ^{[4
,5
]}

Gwinn, Elisabeth G. ^{[4
]}

Vosch, Tom ^{[1
,2
]}

机构：

[1] Univ Copenhagen, Nanosci Ctr, Univ Pk 5, DK-2100 Copenhagen, Denmark

[2] Univ Copenhagen, Dept Chem, Univ Pk 5, DK-2100 Copenhagen, Denmark

[3] UCSB, Chem Dept, Santa Barbara, CA 93117 USA

[4] UCSB, Phys Dept, Santa Barbara, CA 93117 USA

[5] Los Alamos Natl Labs, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

来源：

METHODS AND APPLICATIONS IN FLUORESCENCE | 2018年 / 6卷 / 02期

关键词：

silver nanocluster; fluorescence; excited state relaxation; time-resolved emission spectra; near-IR emitter; time-correlated single photon counting; EXCITED-STATE RELAXATION; FLUORESCENT; CLUSTERS; BASE; NUMBERS; ATOM;

D O I：

10.1088/2050-6120/aaa8bc

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this paper we present a new near-IR emitting silver nanocluster (NIR-DNA-AgNC) with an unusually large Stokes shift between absorption and emission maximum (211 nmor 5600 cm(-1)). We studied the effect of viscosity and temperature on the steady state and time-resolved emission. The time-resolved results on NIR-DNA-AgNC show that the relaxation dynamics slow down significantly with increasing viscosity of the solvent. In high viscosity solution, the spectral relaxation stretches well into the nanosecond scale. As a result of this slow spectral relaxation in high viscosity solutions, a multi-exponential fluorescence decay time behavior is observed, in contrast to the more mono-exponential decay in low viscosity solution.

引用

页数：8

共 38 条

[1] Transfection of living HeLa cells with fluorescent poly-cytosine encapsulated Ag nanoclusters [J].