Upconversion and Downconversion Fluorescent Graphene Quantum Dots: Ultrasonic Preparation and Photocatalysis

被引：898

作者：

Zhuo, Shujuan ^{[1
,2
,3
]}

Shao, Mingwang ^{[1
,2
]}

Lee, Shuit-Tong ^{[4
,5
]}

机构：

[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Jiangsu, Peoples R China

[2] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China

[3] Anhui Normal Univ, Coll Chem & Mat Sci, Anhui Key Lab Funct Mol Solids, Wuhu 241000, Peoples R China

[4] City Univ Hong Kong, Ctr Super Diamond & Adv Films, Hong Kong, Hong Kong, Peoples R China

[5] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China

来源：

ACS NANO | 2012年 / 6卷 / 02期

基金：

中国国家自然科学基金;

关键词：

graphene quantum dots; upconversion luminescence; photocatalysts; DEGRADATION; BLUE;

D O I：

10.1021/nn2040395

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 TiO2/GQD and anatase TiO2/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO2/GQD complex system is ca. 9 times larger than that of the anatase TiO2/GQD complex under visible light (lambda > 420 nm) irradiation in the degradation of methylene blue.

引用

页码：1059 / 1064

页数：6

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