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| Submicron diamond powders were synthesized by plasma electrolysis (PE) in 1-propanol solutions without catalysts. The yields and structures of solid phase products were studied. The compositions and structures of the solid products were characterized by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transformation infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). The results show that the yields of solid products increased with the increment of 1-propanol solutions concentration, discharged voltage and discharged time. The solid products were mainly composed of submicron diamond. The groups of C-O-C, C-C, CH2 and CH3 were determined from the FTIR analysis. The presence of sp2 and sp3 carbon hybridization were confirmed by XPS. The Raman spectroscopy indicated that the first order Raman shift G mode and D mode of submicron diamond were located around 1332 cm-1 and 1580 cm-1, respectively. D mode was accelerated toward to lower wave numbers with the increasing of discharged time and discharged voltage. The intensity ratio ID/IG decreased with the increment of discharged voltage, and discharged time, respectively. This study proved the PE process could be used to prepare submicron diamond. |
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| Keywords:submicron diamond; plasma electrolysis; Raman spectrum; 1-propanol |
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