Journal Article Sol-gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Kukobat, Radovan  ,  Minami, Daiki  ,  Hayashi, Takuya  ,  Hattori, Yoshiyuki  ,  Matsuda, Takafumi  ,  Sunaga, Motoo  ,  Bharti, Bhuvnesh  ,  Asakura, Kiyotaka  ,  Kaneko, Katsumi

94pp.518 - 523 , 2015-11 , PERGAMON-ELSEVIER SCIENCE LTD
We report a bimetallic Zn/Al complex as an efficient inorganic dispersant for SWCNT, synthesized from Zn(CH3COO)(2) and Al(NO3)(3). The Zn/Al complex shows more than four times greater efficiency at dispersing SWCNT than widely used surfactants (CTAB and SDS). Besides remarkable dispersibility, the Zn/Al complex does not foam upon any shaking treatment and it can be used just after quick dissolution of the powdered form, which is a marked advantage over surfactants. The Zn/Al complex, containing amorphous Al(CH3COO)(3) and a complex of Zn2+ and NO3- ions, should have a unique dispersion mechanism, differing from the surfactants. Al(CH3COO)(3) has higher affinity for SWCNT than ions, adsorbing onto its surface in the first layer and attracting Zn2+ and NO3- ions. Charge transfer interactions between the Zn/Al complex and SWCNT, as evidenced by optical absorption spectroscopy, should induce a charge on SWCNT; the zeta potential of such coated SWCNT was +55 mV, indicating a high dispersion stability in aqueous media. Hence, the Zn/Al complex can widen the applications of SWCNT to various technologies such as the transparent and conductive films, as well as high performance composite polymers. (C) 2015 Elsevier Ltd. All rights reserved.

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