title: CVD growth of N-doped carbon nanotubes on silicon substrates and its mechanism.
abstract: In the present study, we report the chemical vapor deposition (CVD) of nitrogen-doped (N-doped) aligned carbon nanotubes on a silicon (Si) substrate using ferrocene (Fe(C5H5)2) as catalyst and acetonitrile (CH3CN) as the carbon source. The effect of experimental conditions such as temperature, gaseous environment, and substrates on the structure and morphology of N-doped carbon nanotubes arrays is reported. From XPS and EELS data, it was found that the nitrogen content of the nanotubes could be determined over a wide range, from 1.9% to 12%, by adding the addition of hydrogen (H2) to the reaction system. It was also shown by SEM that N-doped carbon nanotube arrays could be produced on Si and SiO2 substrates at suitable temperatures, although at different growth rates. Using these concentrations, it was possible to produce three-dimensional (3D) carbon nanotubes architectures on predetermined Si/SiO2 patterns. The mechanism underlying the effect of nitrogen containing carbon sources on nanotube formation was explored using X-ray photoelectron spectroscopy (XPS).
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices, Center for Nanoscale Science and Technology (CNST), College of Chemistry & Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Maoshuai
authors.initials: M
authors.lastname: He
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhou
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhongfan
authors.initials: Z
authors.lastname: Liu
authors.forename: Colin
authors.initials: C
authors.lastname: Robinson
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D005296:Ferrous Compounds / Q000737:chemistry; D005740:Gases; D007202:Indicators and Reagents; D000075163:Metallocenes; D043942:Nanotubes / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013696:Temperature
chemical_list: D000097:Acetonitriles; D005296:Ferrous Compounds; D005740:Gases; D007202:Indicators and Reagents; D000075163:Metallocenes; D002244:Carbon; D009584:Nitrogen; C004998:ferrocene; C032159:acetonitrile; D012825:Silicon