Preparation of large area carbon nanotubes cold cathode by one-step TCVD and its performance on field emission
An innovative one-step Thermal Chemical Vapor Deposition(TCVD)method is presented for the synthesis of large-area(1 cm2)carbon nanotubes(CNTs)directly on silicon substrates by using ferrocene pyrolysis.By precisely controlling the pyrolysis temperature of ferrocene within the range of 650～1000℃,optimal ferrocene to carbon conversion efficiency and high-quality carbon nanotubes with excellent crystallin-ity are achieved.The consequential impact of varying pyrolysis temperatures on the microstructure of carbon nanotubes and their field emission performance is thoroughly investigated.The results of the field emission ex-periments demonstrate that the carbon nanotubes synthesized under the optimized pyrolysis temperature(850℃)exhibit outstanding field emission characteristics,with impressive turn-on field(10 μA/cm2)and threshold field(1 mA/cm2)values of 1.32 V/μm and 2.64 V/μm,respectively.Furthermore,these CNTs display a remarkable maximum current density of 14.51 mA/cm2 and a field enhancement factor of 13 267.The proposed one-step fabrication method,which eliminates the need for etching gas or photolithography pat-terning processes,not only ensures safety and cost-effectiveness but also allows for high reproducibility.As a result,it holds significant potential for utilization in the field emission cold cathodes of carbon nanotubes.
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