We present a simple, environment-friendly, and fast synthesis of nitrogen-doped graphene quantum dots (N-GQDs) on copper foil by chemical vapor deposition using exclusively chitosan, a cheap and nontoxic biopolymer, as a carbon and nitrogen precursor. We characterized the synthesized N-doped graphene quantum dots using Raman spectroscopy, XPS, AFM, HRTEM, and HRSEM and found them to be in the range 10-15 nm in diameter and 2-5 nm-thick with 4.2% of maximum nitrogen content. The proposed growth mechanism process includes three key steps: (1) decomposition of chitosan into nitrogen-containing compounds, (2) adsorption of reactive species (HCN) on the copper surface, and (3) nucleation to form N-doped graphene quantum dots. The synthesized N-GQDs exhibit photoluminescence (PL) emission in the visible band region, thus making them suitable for applications in nano-optoelectronics.
|Number of pages||7|
|Journal||Journal of Physical Chemistry C|
|State||Published - 1 Feb 2018|
Bibliographical noteFunding Information:
We thank Dr Giulia Massini for assistance during the course of the experiments. This research was supported by EEC funds (contract no. ENV4-CT97-0584) and Cofinanziamento MURST (ex-40%) funds.
© 2018 American Chemical Society.