[2Hp01-09] Low-dimensional Material/Nanostructure/Nanomaterial (LD/NS/NM)

[2Hp08] Humidity dependence of electrical resistivity of bucky papers with different crystallinity

*Yuta Kakogi¹, Nanami Yamazaki², Masaru Irita², Yoshikazu Homma², Takahiro Yamamoto² (1. Graduate School of Science, Tokyo University of Science, 2. Department of Physics, Tokyo University of Science)

A bucky paper (BP) consists of a large amount of carbon nanotubes (CNTs). Interestingly, electrical resistivity of BPs depends on humidity. In this study, we prepared two types of BPs with different crystallinity. One was prepared by super-growth (SG) methods (low G/D ratio), while the other was prepared by eDIPS methods (high G/D ratio). First, we measured the resistivity at RH = 20 - 80 %. Second, we focused on charge transfer as the cause of the decrease in resistivity with increasing humidity. For this reason, we performed Raman measurement to observe the presence of G-band shift. The resistivity of SG decreased with increasing the humidity, while that of eDIPS was almost unchanged. We expected the G-band shift would be observed in SG-E. However, the G-band shift was observed only in the samples where the resistivity was almost unchanged with increasing humidity. In the presentation, we will discuss about these unexpected results of the G-band shift.