کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366784 | 1388355 | 2011 | 7 صفحه PDF | دانلود رایگان |

Nitrogen doped graphene was synthesized from graphite oxide and urea by thermal solid-state reaction. The samples were characterized by transmission electron microscopy, atomic force microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectra, element analysis, and electrical conductivity measurement. The results reveal that there is a gradual thermal transformation of nitrogen bonding configurations from amide form nitrogen to pyrrolic, then to pyridinic, and finally to “graphitic” nitrogen in graphene sheets with increasing annealing temperature from 200 to 700 °C. The products prepared at 600 °C and 700 °C show that the quantity of nitrogen incorporated into graphene lattice is â¼10 at.% with simultaneous reduction of graphite oxide. Oxygen-containing functional groups in graphite oxide are responsible for the doping reaction to produce nitrogen doped graphene.
⺠N doping is based on oxygen-containing groups of GO and amino-groups of urea. ⺠There is a thermal transformation of N bonding configurations in graphene structure. ⺠High concentrations (â¼10 at.%) of N are incorporated into graphene lattice.
Journal: Applied Surface Science - Volume 258, Issue 5, 15 December 2011, Pages 1704-1710