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Mn 3 O 4 –graphene (Mn 3 O 4 –GR) hybrids were synthesized using a one-step strategy under solvothermal conditions. During this process graphene oxide (GO) was reduced to GR and at the same time ultrafine Mn 3 O 4 nanoparticles (NPs) with a size of ∼10nm were uniformly anchored on the GR sheets. The Mn 3 O 4 –GR hybrids showed promising...
We have developed an easy and scalable chemical reduction method assisted by microwave irradiation for the synthesis of reduced graphene oxide (RGO) nanosheets in solid state. The as-synthesized RGO is characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetry, X-ray diffraction, X-ray photoelectron spectroscopy and atomic force microscopy. It is revealed that the...
The number of oxygen-containing functional groups (OCFGs) on the surface of a commercial activated carbon (AC) was maximized using ammonium persulfate ((NH 4 ) 2 S 2 O 8 , APS) as an oxidant. Effects of the oxidation conditions, including temperature, time and concentration of APS, on physical and chemical properties of the treated AC were examined to develop a relationship...
A feasible and scalable CO 2 -assisted arc discharge method was developed to directly synthesize single-walled carbon nanotubes (SWCNTs) with largely semiconducting species. Not only was electronic-type selectivity achieved on a large scale, with a semiconducting SWCNT (s-SWCNT) content of >90%, but also diameter selectivity was obtained, with a majority having diameters of >1.5nm. The...
Surface functional groups on carbon materials are critical to their surface properties and related applications. Many characterization techniques have been used to identify and quantify the surface functional groups, but none is completely satisfactory especially for quantification. In this work, we used oxygen K-edge X-ray absorption near edge structure (XANES) spectroscopy to identify and quantify...
Boron and nitrogen co-doped single-walled carbon nanotubes (BN-SWCNTs) were directly synthesized at large scale using an electric arc discharge method. X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and UV–vis–NIR spectroscopy were performed to investigate structure and properties of BN-SWCNTs. These results show that the band gaps of SWCNTs have been...
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