Differential conductance fluctuation of curved nanographite sheets in the mesoscopic regime

• Published in: Solid state communications Vol. 145; no. 7; pp. 341 - 345
• Main Authors: Wang, Haomin, Choong, Catherine, Zhang, Jun, Teo, Kie Leong, Wu, Yihong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2008; Elsevier
• Subjects: A. Nanographite sheets; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Differential conductance fluctuations; D. Electron transport; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Physics; A. Nanographite sheets; 73.23.-b; 73.40.-c; D. Electron transport; 81.05.Uw; 73.63.-b; D. Differential conductance fluctuations; Energy gap; Fluctuations; Electrical conductivity; Temperature effects; Graphite; A. Nanographite sheets; D. Electron transport; D. Differential conductance fluctuations; Electron mobility; Measuring methods; PECVD; Nanostructured materials; 73.23.-b; 73.63.-b; 73.40.-c; 81.05.Uw; Nanowall
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2007.12.005

Excess conductance fluctuations with peculiar temperature dependence from 1.4 to 250 K were observed in curved nanographite sheets with electrode gap lengths of 300 and 450 nm, whereas the conductance fluctuation is greatly suppressed above 4.2 K when the electrode gap lengths increase to 800 and 1000 nm. The former is discussed in the context of the presence of a small energy bandgap in the nanographite sheets, while the latter is attributed to the crossover from the coherent transport to diffusive transport regime.