Reduction Expansion Synthesis as Strategy to Control Nitrogen Doping Level and Surface Area in Graphene
Luhrs, Claudia C.
MetadataShow full item record
Graphene sheets doped with nitrogen were produced by the reduction-expansion (RES) method utilizing graphite oxide (GO) and urea as precursor materials. The simultaneous graphene generation and nitrogen insertion reactions are based on the fact that urea decomposes upon heating to release reducing gases. The volatile byproducts perform two primary functions: (i) promoting the reduction of the GO and (ii) providing the nitrogen to be inserted in situ as the graphene structure is created. Samples with diverse urea/GO mass ratios were treated at 800 C in inert atmosphere to generate graphene with diverse microstructural characteristics and levels of nitrogen doping. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to study the microstructural features of the products. The effects of doping on the samples structure and surface area were studied by X-ray diffraction (XRD), Raman Spectroscopy, and Brunauer Emmet Teller (BET). The GO and urea decomposition-reduction process as well as nitrogen-doped graphene stability were studied by thermogravimetric analysis (TGA) coupled with mass spectroscopy (MS) analysis of the evolved gases. Results show that the proposed method offers a high level of control over the amount of nitrogen inserted in the graphene and may be used alternatively to control its surface area. To demonstrate the practical relevance of these findings, as-produced samples were used as electrodes in supercapacitor and battery devices and compared with conventional, thermally exfoliated graphene.
The article of record as published may be found at http://dx.doi.org/10.3390/ma8105359
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Palaniuk, D. Ryan (Monterey, California. Naval Postgraduate School, 2012-09);Self standing nitrogen doped graphene sheets were produced by reduction-expansion method, which utilizes graphite oxide (GO) and urea as precursor materials. For comparison, an Atmospheric Microwave Plasma Torch system ...
Menon, Sarath K.; Luhrs, Claudia C.; Arias-Monje, Pedro J.; Zea, Hugo; Osswald, Sebastian (American Scientific Publishers, 2016);This work aimed to produce nitrogen doped graphene from Graphite Oxide (GO) by combining the Expansion Reduction Synthesis (RES) approach, which utilizes urea as doping/reducing agent, with the use of an Atmospheric ...
Mowry, Michael N. (Monterey, California. Naval Postgraduate School, 2012-09);Graphene, 10 or fewer atomic layers of carbon atoms, has attracted much attention during recent years due to its unique structure and exceptional physical properties. While there exist a wide range of potential applications, ...