^aL. W. Chang, ^aP. S. Wu, ^bJ. T. Lue and ^aZ. P. Chen

^aDepartment of Electrical Engineering and ^bDepartment of Physics,

National Tsing Hua University, Hsin Chu, Taiwan

E-mail: jtlue@phys.nthu.edu.tw

Received: 28 August 2008 /Accepted: 19 January 2009 /Published: 26 January 2009

Abstract: Multiwall carbon nanofibers (MWCNFs) were directly grown across the catalyst electrodes fabricated through photolithography by a microwave plasma-enhanced chemical vapor deposition (MPECVD) method. The conductivities were measured repeatedly at various ranges of the drain-source voltage V_DS at low temperatures which shows clearly the nonlinear behavior in electrical conductance. The electric-charging energy increases as the length and diameter of the floated carbon nanowire increases in accord with the theoretical estimation for capacitive charging as further verified from the experimentally nonlinear I-V characterization. The oscillation of the I-V curves is tacitly assumed to be embodied in the irregular variation of conductance rewarding the tremendous applications of single-electron devices for MWCNFs. The directly lateral growth of MWCNFs across electrodes allows a high contact current in spite of the existence of tunneling barriers between the wire and electrodes. The high absorption capacity of environment gases of this device is expecting it to have a pragmatic use in gas sensing.

Keywords: Field-effect-transistor behavior, Electric conduction of multiwall carbon nanofiber, Quantum rod behavior

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aL. W. Chang, aP. S. Wu, bJ. T. Lue and aZ. P. Chen

^aL. W. Chang, ^aP. S. Wu, ^bJ. T. Lue and ^aZ. P. Chen