Raman spectroscopy study of the nanodiamond-to-carbon onion transformation
McDonough, John K.
MetadataShow full item record
Here, we present a comprehensive study analyzing early stages of the transformation of detonation nanodiamond (ND) powder to graphitic carbon onions via thermal annealing in argon atmosphere. Raman spectroscopy was employed to monitor this transformation, starting with the sp³-to-sp² conversion of the ND surface at the onset of the graphitization process. Additionally, transmission electron microscopy, x-ray diffraction, and thermogravimetric analysis were used to supplement the structural information obtained from Raman spectroscopy and allow for an accurate interpretation of the obtained Raman data. The effect of the annealing time on the transformation process was also studied to determine the kinetics of the conversion at low temperatures. The results presented in this study complement previous work on ND annealing and provide deeper insight into the nanodiamond-to-carbon onion conversion mechanism, in particular the time and size dependence. We present further evidence for the existence of a disordered sp² phase as an intermediate step in the transformation process.
The article of record as published may be found at http://dx.doi.org/10.1088/0957-4484/24/20/205703
Showing items related by title, author, creator and subject.
In Situ Raman Spectroscopy of the Nanodiamond-to- Carbon Onion Transformation During Thermal Annealing of Detonation Nanodiamond Powder Cebik, Jonathan E. (Monterey, California. Naval Postgraduate School, 2012-06);In this study, in situ Raman spectroscopy is utilized to investigate the onset of nanodiamond (ND) graphitization, the conversion of diamond (sp3) to graphitic (sp2) carbon, and the subsequent formation of carbon onions. ...
The effects of isothermal deformation and annealing on the microstructure of nickel-aluminum-bronze propeller material Nabach, William A. (Monterey, California. Naval Postgraduate School, 2003-06);This thesis is a study of annealing and isothermal deformation characteristics of cast Nickel-Aluminum Bronze (NAB) in relation to Friction Stir Processing (FSP) of this material. Cast NAB is widely utilized by the U.S. ...
McNelley, T.R.; Swisher, D.L.; Pérez-Prado, M.T. (Elsevier, 2002);Superplastic aluminum alloys are often classified according to the mechanism of microstructural transformation during annealing after deformation processing. In Al-Cu-Zr materials, such as Supral 2004, the presence of ...