Abstract
A noncatalytic chemical vapor deposition method was used to prepare graphitized carbon spheres (CSs) from acetylene. The CSs (diameter of 115±10nm) with n type conductivity were found to be photo-electrochemically active with a diffuse reflectance spectrum band gap of 1.01eV. The electrical conductivity followed an Arrhenius type law with an activation energy of 0.53eV. From the capacitance measurements, the flat band potential (Vfb=−0.75VSCE) and the electron density (ND=3.46×1015cm−3) were determined.
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