CONTROLLED FABRICATION OF LARGE SCALE ALIGNED CARBON NANOFIBER /NANOTUBE PATTERN BY PHOTOLITHOGRAPY

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1st paper: Template-based carbon nanotubes and their application to a field emitter 2nd paper: Controlled fabrication of Large Scale Aligned Carbon Nanotubes patterns by Photo Lithography Purpose of research and emphasis/main topic of publication: The aim of the first paper is to illustrate fabrication methods for large scale aligned carbon nano fiber/nanotube patterns on substrates. They used patterning metal-containing photoresists that was with conventional of black and white film which considered like a mask. The second paper was aimed to study the CNT as filed emitter device which obtained from anodic aluminum oxide (AAO) template of thin film in a silicon wafer. Controlling the growth of the CNT and its properties was related to the (AAO) templates. Methodology: The methodology of the first work was depending on three steps: the fabrication of the film photomask and pattern by the photolithography, growth of the aligned carbon nano-fiber and nanotube by the pyrolysis of acetylene and the characterization for both scanning of electron microscopy (SEM) and transmission of electron microscopy (TEM). They included some other techniques for example: for the patterning aligned and nonaligned carbon nanotube included offset printing standard lithography, soft lithography and self-assembly to pattern catalysts. The structure preparation of perfect carbon nanotubes was prepared from different techniques including laser ablation, arc discharge and chemical vapor deposition (CVD) which always been carried on high temperatures. The first step of the methodology was the direct photolithography method which used a photomask of white and black films. PVA and N-methylalacrylamide as a crosslinking agent, salt as (acid/free-radical generato... ... middle of paper ... ... screen because of the possibility of damaging the phosphor screen. Evaluation They have the same goal which is CNTs growth by using different methods like photosynthesis fabrication, by pyrolysis of hydrocarbon or catalyst deposits. Both works had used the pattering alignment for the growing CNTs. They used various techniques to investigate their work the commons were the SEM and TEM with several parameters. For the fabrication of CNTs on different methods depend on the application. The first research group tried to control the growth CNTs on the glass substrates while the second research used AAO template for the CNTs overgrowth and both of them depend on the catalyst distribution or deposition. It is essential to illustrate more exploration and practical investigation on both research areas also their application for prototyping and field emission.

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