TAILIEUCHUNG - Báo cáo hóa học: "Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes | Nanoscale Res Lett 2007 2 75-80 DOI S11671-006-9033-5 NANO EXPRESS Single step process for the synthesis of carbon nanotubes and metal alloy-filled multiwalled carbon nanotubes M. M. Shaijumon A. Leela Mohana Reddy S. Ramaprabhu Published online 6 January 2007 to the authors 2007 Abstract A single-step approach for the synthesis of multi-walled nanotubes MWNT filled with nanowires of Ni ternary Zr based hydrogen storage alloy has been illustrated. We also demonstrate the generation of COfree hydrogen by methane decomposition over alloy hydride catalyst. The present work also highlights the formation of single-walled nanotubes SWNT and MWNTs at varying process conditions. These carbon nanostructures have been characterized by scanning electron microscopy SEM transmission electron microscopy TEM high resolution TEM HRTEM Energy dispersive X-ray analysis EDX and Raman spectroscopy. This new approach overcomes the existing multi-step process limitation with possible impact on the development of future fuel cell nano-battery and hydrogen sensor technologies. Keywords Carbon nanotubes Nanowires Encapsulation Hydrogen production Alloys Chemical vapour deposition Filling carbon nanotubes CNTs has prompted significant progress in preparation of novel materials with potential control over their intrinsic mechanical and physical properties 1-3 . The confined environments of nanotubes permit the formation of unique encapsulated low dimensional structures with unusual properties compared with the bulk with possible applications M. M. Shaijumon A. Leela Mohana Reddy S. Ramaprabhu El Department of Physics Alternative Energy Technology Laboratory Indian Institute of Technology Madras Chennai Tamilnadu 600036 India e-mail ramp@ as nano-catalysts electronic devices and magnetic tapes 4 5 . Most of the previously reported methods for the fabrication of these one-dimensional nanostructures involve multi-step processes following CNT synthesis 6-8 . Various techniques

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