The International Union of Pure and Applied Chemistry designated the isotope C-12 as the basis for atomic weights, while the unstable isotope C-14, with a half-life of 5700 years, is used for carbon dating. The double peak observed in the C1s is characteristic of the graphene oxide and it was deconvoluted into six peaks. Curve fitting analysis of the XPS C1s spectra of the RGO samples affords three peaks at 284.6 eV (sp2 C-C), 285. Carbon-based compounds are the basis for all living systems and comprise the structure of fossil fuels in the form of hydrocarbons. 6 c) shows the XPS analysis of C1s and O1s peaks for the graphene oxide. The XPS C 1s spectrum of GO can be fitted into three peaks centered at 284.6 eV, 286.7 eV and 287.5 eV, which could be indexed to the sp2 hybridized carbon, the carbon in C-O and CO bonds,1 respectively. Carbon’s small size allows it to form multiple bonds with many other small atoms, including carbon atoms, and is prevalent in a large number of chemical compounds. Four allotropes of carbon are known: amorphous (e.g., charcoal and soot), graphite, diamond, and fullerenes. Obtained from: burning with insufficient oxygenĬarbon has been known since ancient times when it was produced by burning organic material in the presence of insufficient oxygen.
