[14p-K207-1~21] 17.1 Carbon nanotubes & other nanocarbon materials

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)

[14p-K207-11] [The 57th Young Scientist Presentation Award Speech] Complex chemistry in doped carbon nanotubes and enhancing thermal stability via ion exchange

〇Kaho Kawasaki¹, Yasuko Koshiba^1,2, Qingshuo Wei^3,4, Kouki Akaike³, Masahiro Funahashi^1,2, Kenji Ishida^1,2,5, Shohei Horike^1,2,3,6 (1.Kobe Univ., 2.Res. Ctr. Membrane & Film Tech., Kobe Univ., 3.AIST, 4.Univ. Tsukuba, 5.Kyushu Univ., 6.Ctr. Environ. Mgmt., Kobe Univ.)

Keywords:

Carbon nanotube,Doping,Complex chemistry

Controlling the major carrier type and its density of carbon nanotubes (CNTs) is essential for their implementation in electronic devices. However, ensuring the stability of doped states at high temperatures is still challenging. In this study, the doped state of CNTs is regarded as “complexes composed of CNTs and adsorbed ions for charge compensation”. We demonstrate that the stability mechanism of doped state could be understood by HSAB concept. Chemical hardness (quantitative parameter of HSAB theory) of adsorbed ions was a useful parameter to estimate the stability of p-doped CNTs. Furthermore, replacement of the adsorbed anions from harder to softer species resulted in enhanced stability at high temperatures over 2 years.