Graphene Quantum Dots Derived from Carbon Fibers
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- 作者：Juan Peng ; Wei Gao ; Bipin Kumar Gupta ; Zheng Liu ; Rebeca Romero-Aburto ; Liehui Ge ; Li Song ; Lawrence B. Alemany ; Xiaobo Zhan ; Guanhui Gao ; Sajna Antony Vithayathil ; Benny Abraham Kaipparettu ; Angel A. Marti ; Takuya Hayashi ; Jun-Jie Zhu ; Pulickel M. Ajayan
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：February 8, 2012
- 年：2012
- 卷：12
- 期：2
- 页码：844-849
- 全文大小：438K
- 年卷期：v.12,no.2(February 8, 2012)
- ISSN：1530-6992
文摘
Graphene quantum dots (GQDs), which are edge-bound nanometer-size graphene pieces, have fascinating optical and electronic properties. These have been synthesized either by nanolithography or from starting materials such as graphene oxide (GO) by the chemical breakdown of their extended planar structure, both of which are multistep tedious processes. Here, we report that during the acid treatment and chemical exfoliation of traditional pitch-based carbon fibers, that are both cheap and commercially available, the stacked graphitic submicrometer domains of the fibers are easily broken down, leading to the creation of GQDs with different size distribution in scalable amounts. The as-produced GQDs, in the size range of 1鈥? nm, show two-dimensional morphology, most of which present zigzag edge structure, and are 1鈥? atomic layers thick. The photoluminescence of the GQDs can be tailored through varying the size of the GQDs by changing process parameters. Due to the luminescence stability, nanosecond lifetime, biocompatibility, low toxicity, and high water solubility, these GQDs are demonstrated to be excellent probes for high contrast bioimaging and biosensing applications.