The phosphorescence and excitation-wavelength dependent fluorescence kinetics of large-scale graphene oxide nanosheets

Abstract

In this study, phosphorescence emission and a strong excitation-wavelength dependent fluorescence has been found in large-scale graphene oxide (GO) nanosheets. GO was covalently functionalized with triphenylamine (GO-CONH-TPA) in order to enhance the GO fluorescence quantum yield to 18%. The intersystem crossing (ISC) dynamics were studied using a femtosecond transient absorption technique, which appeared in the same timescale as the fluorescence dynamics of GO-CONH-TPA in both a polar solvent and solid film. Therefore, both, the solvation (several hundreds of picoseconds) and the intersystem crossing (ISC) gave rise to the strong excitation-wavelength dependent fluorescence.Moreover, the phosphorescence emission of the GO-CONH-TPA film at room temperature has been described for the first time in this report, and the lifetime of phosphorescence was found to be 6.95 ms.The fluorescence kinetics of GO-CONH-TPA were attributed to the aromatic hydrocarbon-carboxylic domain structure of GO.

Ultrafast Electron Transfer Dynamics of Organic Polymer Nanoparticles with Graphene Oxide

“…Synthesis of GO, RGO, p3ht NPs, and p3ht NPs-GO/RGO composites: GO was synthesized using the method of modified Hummers, [28] and we have previously investigated the properties of GO solutions in details. [29] Ethanol solution (Et) of RGO was obtained by irradiating the ethanol solution of GO with ultraviolet light at the central wavelength of 365 nm (power density of 0.25 mW/cm 2 ) for 10 h, and the solution color became darker after GO's reduction in ethanol solution.…”

Влияние Лигандов И Растворителя На Безызлучательные Переходы В Полупроводниковых Квантовых Точках (Обзор)

“…На основе этих и ранее предложенных CQD, люминесцирующих в голубой и зеленой областях спектра, сконструирован макет излучателя теплого белого света с высокой световой отдачей. В работе [67] была исследована кинетика флуоресценции и фосфоресценции квантовых точек из окиси графена, пассивированых трифениламином. Помещенные в полимер (PMMA), они обнаруживают флуоресценцию с выходом 0.18 и фосфоресценцию с выходом 0.02 и длительностью 6.95 мкс.…”

“…Авторы работы [67] изучали фосфоресценцию от квантовых точек, построенных из обычного и окисленного графена, в том числе пикосекундные процессы заселения триплетного состояния.…”

A potential sensing mechanism for DNA nucleobases by optical properties of GO and MoS2 Nanopores

“…Graphene oxide GO is a functionalized few layered forms of graphene with oxygen functional groups that are attached on the basal plane. Studies show that the photoluminescence emission of GO in a polar solvent, like water, is dependent on the excitation wavelength 14,15 . The position of the fluorescence peak of GO in such polar solvent, without changing the GO sheet size, red-shifts with increasing excitation wavelength.…”