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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：Physical chemistry chemical physics : PCCP

收录刊物：PubMed、SCIE

卷号：20

期号：19

页面范围：13316-13321

ISSN号：1463-9084

摘要：The special helical morphologies and polycrystalline-amorphous internal structures differ carbon nanocoils (CNCs) from carbon nanotubes or carbon nanofibers, but bring difficulties in illuminating the correlations between physical and structural properties. In this paper, we measure the electrical conductivity (sigma), thermal diffusivity (alpha) and Young's modulus (E) of single CNCs at the same time, using a transient electrothermal technique and an electromechanical vibration technique. Based on the statistical results of 8 single CNC samples, a linear correlation between the three parameters is uncovered, expressed as sigma = 0.052(alpha - 2.5) * 104 S m-1, E = (-10.38sigma + 14.04) GPa and E = (-0.59alpha + 16.08) GPa, where the unit of alpha is 10-7 m2 s-1. Concise proportional relations between the three parameters and average graphite grain size (ld) are deduced, expressed as sigma = Ald(C1 - T)-1, alpha = Bld(C2 + T)-1 and E = -Dld + E0. The proportional relation between physical parameters and ld demonstrates the confinement originated from the nano-grain system.