Physica B 323 (2002) 267–268 Thermoelectric power of single walled carbon nanotubes containing alcohol molecules S. Masubuchi a, *, K. Ooiwa a , H. Kataura b , Y. Maniwa b , S. Suzuki c , Y. Achiba c , S. Kazama d a Department of Physics, Tokyo Medical University, Shinjuku-ku, 162-8402 Tokyo, Japan b Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397 Tokyo, Japan c Department of Chemistry, Tokyo Metropolitan University, Hachioji, 192-0397 Tokyo, Japan d Department of Physics, Chuo University, Bunkyo-ku, 112-8551 Tokyo, Japan Abstract Thermoelectric power, SðT Þ; for single walled carbon nanotubes (SWNT) shows a strong curved T -dependence. The results of SðT Þ are interpreted as the effect of the interaction between conduction electrons and transition metals; i.e. Kondo effect. However, for SWNT containing alcohol molecules such as methanol or ethanol, the SðT Þ is almost proportional to T : The results indicate the characteristic metallic behavior in SWNT doped with O 2 . r 2002 Elsevier Science B.V. All rights reserved. Keywords: Nanotubes; Thermoelectric power; Resistivity; Transport properties Thermoelectric power, SðT Þ; for single walled carbon nanotubes (SWNT) shows a strong curved T -dependence depending on the catalyst used in synthesizing, as has been reported by several groups [1,2]. The results were interpreted as the effect of the interaction between conduction electrons and transition metals; i.e. Kondo effect [2]. In our previous work, we reported that the SðT Þ for SWNT containing ethanol (EtOH) or N,N-dimethyformamide (DMF) molecules was almost proportional to T with intercept of nearly zero, indicating typical metallic behavior [3]. In this paper, we will report on an experimental result on SðT Þ in SWNT containing alcohol molecules such as methanol (MeOH), isopropyl alcohol (IPA) or butanol (BuOH). SWNT was prepared by the arc discharge method using NiY as a catalyst. To form an SWNT mat, the SWNT was dispersed in alcohols such as MeOH, EtOH, IPA or BuOH under sonication. In this experiment, alcohols were used as purchased. The dispersed solution was filtered by suction. SWNT mat on a filter paper was peeled off and dried. We called the mat samples as dried SWNT. To compare commonly used sample, we also prepared heat-treated sample by applying 3501C for 1h in air. Electrical resistivity and absolute thermoelectric power were measured between 4.2 and 300K. The detailed experimental procedure was previously reported [4]. *Corresponding author. Tel.: +81-3-3351-6141; fax: +81-3- 3351-6110. E-mail address: masubuch@tokyo-med.ac.jp (S. Masubuchi). 0921-4526/02/$-see front matter r 2002 Elsevier Science B.V. All rights reserved. PII:S0921-4526(02)00987-0