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. 2016 Mar 21;6:23319. doi: 10.1038/srep23319

Figure 1. Assembled random network of carbon nanotubes and their optical absorption characteristics before and after doping.

Figure 1

(a) A scanning electron microscope (SEM, Model Zeiss Ultra 55) image of assembled random network of carbon nanotubes. (b) UV-Vis-NIR spectra of pristine, OA-doped, and PEI-doped SWNT network. (c) Schematic diagram showing the doping process of OA and PEI to SWNTs, respectively. OA forms a charge-transfer complex with the SWNTs, injecting holes into the SWNT network. Electrons from amine groups are donated to the SWNT network when PEI winds around the carbon nanotube.