Upconversion and downconversion fluorescent graphene quantum dots: Ultrasonic preparation and photocatalysis

Shujuan Zhuo; Mingwang Shao; Shuit-Tong Lee

doi:10.1021/nn2040395

Upconversion and downconversion fluorescent graphene quantum dots: Ultrasonic preparation and photocatalysis

Shujuan Zhuo, Mingwang Shao, Shuit-Tong Lee

Centre of Super-Diamond and Advanced Films

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

997 Citations (Scopus)

Abstract

A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO ₂/GQD and anatase TiO ₂/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO ₂/GQD complex system is ca. 9 times larger than that of the anatase TiO ₂/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue. © 2012 American Chemical Society.

Original language	English
Pages (from-to)	1059-1064
Journal	ACS Nano
Volume	6
Issue number	2
DOIs	https://doi.org/10.1021/nn2040395
Publication status	Published - 28 Feb 2012

Research Keywords

graphene quantum dots
photocatalysts
upconversion luminescence

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abstract = "A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO 2/GQD and anatase TiO 2/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO 2/GQD complex system is ca. 9 times larger than that of the anatase TiO 2/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue. {\textcopyright} 2012 American Chemical Society.",

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T1 - Upconversion and downconversion fluorescent graphene quantum dots

T2 - Ultrasonic preparation and photocatalysis

AU - Zhuo, Shujuan

AU - Shao, Mingwang

AU - Lee, Shuit-Tong

PY - 2012/2/28

Y1 - 2012/2/28

N2 - A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO 2/GQD and anatase TiO 2/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO 2/GQD complex system is ca. 9 times larger than that of the anatase TiO 2/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue. © 2012 American Chemical Society.

AB - A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO 2/GQD and anatase TiO 2/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO 2/GQD complex system is ca. 9 times larger than that of the anatase TiO 2/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue. © 2012 American Chemical Society.

KW - graphene quantum dots

KW - photocatalysts

KW - upconversion luminescence

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DO - 10.1021/nn2040395

M3 - RGC 21 - Publication in refereed journal

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JF - ACS Nano

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Upconversion and downconversion fluorescent graphene quantum dots: Ultrasonic preparation and photocatalysis

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