Carbon black, graphitized irradiation

Fig. 12.24 Raman spectra of carbon nanomaterials and corresponding optical images of (a) carbon black (514-rnn excitation) and (b) nanodiamond (325-nm laser excitation) before and after laser-induced light emission, recorded in Ar atmosphere. Carbon black is evaporated by the laser and redeposited as amorphous carbon around the excitation spot. ND is evaporated or transformed into graphitic carhon upon irradiation. The scale bar in the photograph is 15 pm...

Cadenhead 125) looked in more detail at the shape of the isotherm of krypton on a graphitized carbon black. The isotherm before irradiation showed the stepped shape attributed by Halsey 139) to a highly homogeneous surface. On such carbon blacks, the stepped isotherm... 

Ozawa et al. proposed another growth mechanisms of carbon onions based on TEM observations of carbon black irradiated by an electron beam [13]. Spiroids are first formed and then carbon onions (Figure 3.3). Qin and lijima also studied the formation of spheroid graphitic particles by irradiating diamond crystals inside a TEM [14]. Since the mechanism of carbon onion formation was not known, several studies were carried out to follow the transformation of diamond nanoparticles into carbon onions directly inside a transmission electron... 

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