Structural Study of Single-Walled Carbon Nanotube Films Doped by a Solution Method

Abstract

Herein, we have studied a structure of SWNT films doped by organic molecules. In this study, we reacted organic molecules with SWNT films by a vapor phase and a liquid phase, respectively. The structure of doped SWNT films was investigated using synchrotron X-ray powder diffraction measurements, and we found the clear difference between the vapor phase reaction (v-doped) and the liquid phase reaction (I-doped). In v-doped SWNT films, organic molecules are predominantly encapsulated inside SWNTs, although molecules adsorbed on the surface of SWNT bundles in l-doped SWNT films.

Inkjet Printing of Carbon Nanotube Complementary Inverters

“…Doping of SWCNTs is different from doping of conventional semiconductor materials because it is difficult for SWCNTs to incorporate foreign atoms, such as nitrogen or boron, into their substitutional or interstitial sites. As a result, adsorbates such as atoms, 16,17) molecules, [17][18][19][20] and polymers [21][22][23] with the appropriate functional groups have been introduced on the nanotube surface. The motion of the electrons between the adsorbates and SWCNTs leads to a change in the Fermi level of the SWCNTs.…”

Continuous Electron Doping of Single-Walled Carbon Nanotube Films Using Inkjet Technique

“…In the hole carrier doping by organic molecules, similar continuous carrier doping has been realized and, finally, the metallization of SWCNTs has been reported. 27,[29][30][31] However, when we used the high density PEI ink, we observed saturation behavior of the doping process without metallization of SWCNTs. These results also suggest the weak electron donating feature of PEI molecules and the final doping level should be the result of the energy difference between the highest occupied molecular orbital of PEI and the conduction band of SWCNTs.…”

Fine Patterning of Inkjet-Printed Single-Walled Carbon-Nanotube Thin-Film Transistors

“…This technique is also applicable to liquid phase carrier doping and will open a route for to printable logic circuits. [31][32][33][34][35][36]…”