The Study Of The Growth Of Carbon Nanotubes And The Thermal Conductive On Copper Substrate

Since the discovery of carbon nanotubes,this special one-dimensional graphite structure has aroused great interest of researchers.Theoretical and experimental results show that carbon nanotubes has high aspect ratio,high mechanical strength,chemical stability and high thermal conductivity,In the rapid development of electronic devices today,the device power become larger and larger,but an effective solution to heat dissipation is still an urgent problem to be solved.The carbon nanotube arrays,which was growth by chemical vapor deposition(CVD)have great potential in the high thermal conductivity applications.There has a good prospect that large area of highly oriented carbon nanotube thermal interface materials for rapid cooling of high-power devices and equipment.From the treatment of copper and CNT growth and then to the thermal conductivity test in this paper,we studied the influence of various factors on the final array of carbon nanotube on copper substrate.Then,the optimal parameter array was selected and the thermal conductivity was measured.To main contents are in details as follows:(1)Considering factors such as temperature,substrate,atmosphere,catalyst,buffer layer and so on,the carbon-nanotube-based thermal conductive materials were optimized in structure.Based on the optimum design,large area and millimeter-long vertically aligned carbon nanotube arrays on copper substrates were synthesized using Chemical Vapor Deposition.(2)The effect of water on the catalyst,the morphology of the array and the height of the array has been studied.It can prevent the agglomeration effect of the catalyst,reduce the array defect and increase the efficiency of the array,and even get a long array of millimeters.And different carbon nanotubes arrays were successfully fabricated on different substrates.(3)Aiming at the thermal management of high-power equipment,the carbon nanotube arrays were used as the thermal interface material and the heat transfer effects were analyzed.Results demonstrate that our method is feasible,and the carbon-nanotube-based thermal conductive materials have promising applications in thermal management.