Growth and field emission properties of carbon nanotubes

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

K. N. Tripathi

Accepted Abstracts: J Material Sci

Abstract :

Carbon nanotubes (CNTs) are currently attractive materials for a diverse range of applications because of their unique properties and potential applications. On applying electric fields, nanotube emits electrons from its tips at a prodigious rate. The field emission (FE) properties of CNTs are governed by the work function, crystalline structure, geometry of their tips, etc. In addition, the surrounding gases and impurities on the surface have been known to strongly affect their FE characteristics. It has been verified in the previous studies that the structural defects on the surface of carbon-based materials could be a crucial factor to determine their FE characteristics. Different transition metal catalyst nanocrystalline films were deposited on silicon substrate using RF sputtering technique. The catalyst coated Si substrate was heated to achieve synthesis temperature at a rate of 15 o C/min while continuously passing the H 2 gas which works as carrier gas. After stabilizing the synthesis temperature at 650 o C, NH 3 gas was passed with flow rate 120 sccm for pretreatment which helps in nucleation of catalyst. Pretreatment reduces the size of catalyst particle up to nanometer level which provides nucleation site for formation of CNTs. A mixture of gases H 2 /C 2 H 2 /NH 3 with flow rate 8:1:8 sccm respectively was used, where C 2 H 2 work as a carbon source gas. Growth temperature was kept constant at 650°C. Scanning electron microscope and Raman study confirm that aligned and high density CNTs successfully grown on the Si substrate.

Biography :

K. N. Tripathi completed his Ph.D. at the age of 25 years from The University of Delhi, India and postdoctoral studies from University of New Castle, UK. He has been a Professor in Department of Electronic Science and dean research, University of Delhi and also vice chancellor, Agra University. He has guided 21 students for their Ph.D. and published more than 75 research papers in international journals. Currently, he is the vice chancellor, K. R. Mangalam University, Gurgaon.