Ultrafast and nonlinear spectroscopy of brilliant green-based nanoGUMBOS with enhanced near-infrared emission

被引:10
|
作者
Karam, Tony E. [1 ,3 ]
Siraj, Noureen [1 ,2 ]
Zhang, Zhenyu [1 ]
Ezzir, Abdulrahman F. [1 ]
Warner, Isiah M. [1 ]
Haber, Louis H. [1 ]
机构
[1] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA
[2] Univ Arkansas Little Rock, Dept Chem, Little Rock, AR 72204 USA
[3] CALTECH, Div Chem, Pasadena, CA 91125 USA
来源
JOURNAL OF CHEMICAL PHYSICS | 2017年 / 147卷 / 14期
基金
美国国家科学基金会;
关键词
FLUORESCENT ORGANIC NANOPARTICLES; EXCITED-STATE DYNAMICS; PORPHYRIN-BASED GUMBOS; 2ND-HARMONIC GENERATION; MALACHITE GREEN; TRIPHENYLMETHANE DYES; 3RD-HARMONIC GENERATION; MOLECULAR ADSORPTION; RAYLEIGH-SCATTERING; RELAXATION DYNAMICS;
D O I
10.1063/1.4994712
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The synthesis, characterization, ultrafast dynamics, and nonlinear spectroscopy of 30 nm nanospheres of brilliant green-bis(pentafluoroethylsulfonyl)imide ([BG][BETI]) in water are reported. These thermally stable nanoparticles are derived from a group of uniform materials based on organic salts (nanoGUMBOS) that exhibit enhanced near-infrared emission compared with the molecular dye in water. The examination of ultrafast transient absorption spectroscopy results reveals that the overall excited-state relaxation lifetimes of [BG][BETI] nanoGUMBOS are longer than the brilliant green molecular dye in water due to steric hindrance of the torsional degrees of freedom of the phenyl rings around the central carbon. Furthermore, the second harmonic generation signal of [BG][BETI] nanoGUMBOS is enhanced by approximately 7 times and 23 times as compared with colloidal gold nanoparticles of the same size and the brilliant green molecular dye in water, respectively. A very clear third harmonic generation signal is observed from the [BG][BETI] nanoGUMBOS but not from either the molecular dye or the gold nanoparticles. Overall, these results show that [BG][BETI] nanoGUMBOS exhibit altered ultrafast and nonlinear spectroscopy that is beneficial for various applications including nonlinear imaging probes, biomedical imaging, and molecular sensing. Published by AIP Publishing.
引用
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页数:7
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