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  Journal of Nanoscience Letters 2014, 4: 14
  Research Article
Synthesis and enhanced electron field emission of vertically aligned carbon nanotubes grown on stainless steel substrate
  Suman Neupanea, Yuehai Yanga, Wenzhi Lia, Yihua Gaob  
a Department of Physics, Florida International University, Miami, FL 33199, USA
b Wuhan National Laboratory for Optoelectronics-School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

  Vertically aligned carbon nanotube (CNT) array was synthesized on pristine stainless steel (SS) substrate, chemically etched SS substrate, and Ni/Cr layer coated SS substrate via plasma enhanced chemical vapor deposition method. The effect of chemical etching on the surface morphology of the SS substrates and the growth of the CNTs were investigated. SS substrate chemically etched for 40 min resulted in CNTs with uniform diameter and length. Electron field emission properties of CNT arrays synthesized on pristine SS and Ni/Cr coated SS substrates were measured. It is found that CNTs synthesized on pristine SS substrate exhibited lower turn-on electric field, lower threshold electric field, and a higher field enhancement factor as compared to that from the CNTs synthesized on Ni/Cr coated SS. However, the CNTs synthesized on Ni/Cr coated SS showed better emission stability, which was attributed to the improved adhesion between the CNTs and SS substrate via the Cr thin layer. The results indicate that the conductive substrate, robust contact between the CNTs and the substrate, and the high stability will benefit the field emission applications of the CNTs.
  Carbon nanotube; Stainless steel; Field emission; Plasma Enhanced Chemical Vapor Deposition  

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