Efficient synthesis of rice based graphene quantum dots and their fluorescent properties

被引：69

作者：

Kalita, Hemen ^{[1
]}

Mohapatra, Jeotikanta ^{[2
]}

Pradhan, Lina ^{[2
]}

Mitra, Arijit ^{[1
]}

Bahadur, Dhirendra ^{[3
]}

Aslam, Mohammed ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India

[2] Indian Inst Technol, Ctr Res Nanotechnol & Sci CRNTS, Bombay 400076, Maharashtra, India

[3] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

来源：

RSC ADVANCES | 2016年 / 6卷 / 28期

关键词：

ONE-STEP SYNTHESIS; FACILE SYNTHESIS; OXIDE; PHOTOLUMINESCENCE; GRAPHITE; SIZE; NANOCRYSTALS; DEVICES; AVENUE; PROBES;

D O I：

10.1039/c5ra25706a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a facile green approach to synthesize monodisperse graphene quantum dots (GQDs) of sizes 2-6.5 nm using rice grains as a carbon source. As the size of the GQDs increases from 2-6.5 nm, a red shift (blue to cyan) in the photoluminescence emission spectra is observed due to quantum confinement effect. The colloidal solution of as synthesized GQDs is highly luminescent under 336 nm illumination. The quantum yield (QY) of the as-prepared GQDs in water is size dependent and increases from 16 to 24% with the decrease in size from 6.5 to 2 nm. The potential of these GQDs as biomarkers for cell imaging is explored further. The cytoxicity study with different concentrations of the GQDs confirms the excellent biocompatibility of the GQDs.

引用

页码：23518 / 23524

页数：7

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