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Abstract

We demonstrated the facile and simple route to modify electronic properties of SG (SWCNT) with MB dyes through liquid phase adsorption. The adsorption of MB molecules into the tubes was proved by the notable decrease of X-ray diffraction intensity, depression of the N2 and H2 adsorption uptake at 77 K, and disordered bundle structure of SWCNT obtained from SEM image. The modification of electronic properties of SG (SWCNT) with MB adsorption was remarkably clarified by optical absorption spectra as well as the increase of electrical conductivity owing to the transition in metallic and/or semi conducting nanotubes through the molecular charge transfer interaction between pairs of van Hove singularities. Controlling electronic properties of SWCNT are supposed to be essential for its application in optoelectronic devices.