02582nas a2200253 a 450000500170000000800410001703500150005810000280007324501050010126000570020630000370026349000280030050001580032850200580048652013900054465000220193470000330195670000430198970000490203271000560208171000650213781000600220285600660226220260818222941.0151014s2012    th u  m rtt   000   eng d  a.b121572350 aKataguna Kanoknukulchai10aStudies on the synthesis of carbon nanotubes by chemical vapor deposition using a low vacuum process  aPathum Thani :bAsian Institute of Technology,c2012  a1online resource (68 p.) :bill.1 aThesis ;vno. ISE-12-54  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Nanotechnology, School of Engineering and Technology  aThesis (M. Sc.) - Asian Institute of Technology, 2012  aCarbon  nanotubes  (CNTs)  have  incomparable  physical  properties  and  their  applicationsin  various  fields  have  been  well  established  over  the  last  two  decades.  The  electronic properties   of   CNTs,   however,   significantly   change   depending   on   their   chirality   and the  number  of  graphene  walls.  Therefore,  first  of  all,  theselective  growth  of  graphene  wallsis    required,    and    ultimately,    chiral    selection    technology    should    be    established. In  order  to  improve  the  selectivity  and  uniformity  of  CNTs,  we  have  examined the growthof CNTs on aquartz substrate. Carbon nanotubes (CNTs) were fabricated by chemical vapor deposition  (CVD) using  a low  vacuumprocess.Cobalt  (Co) nanoparticles and molybdenum (Mo)  sensitizerswere  deposited as  metal  catalysts on quartz  substratesby spray evaporation technique.Acetylene wasutilized asthe carbon feedstock  and 5%  H2/Ar  was the  carrier  gas. The  growth  of  CNTswas  carried  out  at  650-750  °C  for  30  minutes.  In  this  work,  optimum CNT   synthesis   conditions   were   determined   for   threereaction   parametersnamely, concentration    of    catalyst    solution, precursor    flow    rate,and reaction    temperature. CNTsamples  were  characterized  by  scanning  electron  microscope  (SEM)  and  transmission electron microscopy(TEM). 0aNanotubes, Carbon1 aDutta, Joydeep,eChairperson1 aHornyak, Louis,eExamination Committee1 aMohammed, Waleed S.,eExamination Committee 2 aRoyal Thai GovernmentFellowship,eScholarship Donor2 aAsian Institute of Technology Fellowship,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. ISE-12-54  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B03381