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The purpose of this work is to investigate a method of synthesis of carbon-nitrogen nanostructures from combined pyrolisis of thin-film polyamide and carbon chemical vapor deposition (CVD) from acetone and camphor, diluted in hydrogen and nitrogen. Copper substrates have been used. After cleaning, the substrates have been coated with polyamide previously diluted in dimethylformamide and then dried in a hot-plate in air at 323 K for 120 min. In the sequence, the samples were immersed in the reaction chamber of a hot-filament CVD system fed with acetone and camphor highly diluted in nitrogen (85 % vol.) and hydrogen (14.5 % vol.). A total flow rate of about 100 sccm, regulated by precision mass flow, and a total pressure of about 20 Torr were maintained throughout. The deposition temperature was 723 K. Optical microscopy revealed round-shaped features of as-deposited carbon films without the need of chemical treatment for purification. These effects are discussed in relation to the morphological data obtained by scanning electron microscopy (SEM), Field emission scanning electron microscopy (FESEM) and results from Raman spectroscopic analyses of samples produced at different deposition times. |