Stabilization of carbon nanotube coatings to moisture
First Claim
1. A CNT composite, comprising:
- a solid dispersion comprising CNTs and a glycosaminoglycan or polysaccharide;
wherein the dispersion comprises at least 20 wt % of the glycosaminoglycan or polysaccharide;
wherein the sum of Na, K, Mg, and Ca associated with the glycosaminoglycan or polysaccharide is less than 1 wt % of the dispersion; and
wherein the solid dispersion possesses one or more of;
a bulk conductivity of 500 S/cm or greater, anda volume average size of CNT particles, as observable by SEM, of 5 μ
m or less, where size is the largest dimension observed in the SEM.
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Abstract
A method of making CNT films is described in which the film is washed with a mild acid treatment. The method generates a CNT film that is not sensitive to moisture or fluctuations in moisture. The method involves the use of anionic polysaccharides or anionic glycosaminoglycans such as hyaluronic acid, sodium salt, as aqueous dispersing agents and their modification to a hydrophobic matrix after deposition. In the course of conducting the work described here, we made the surprising discovery that washing with an aqueous acidic solution resulted in a decrease in resistance through the material. The invention also includes CNT composites made by the inventive methods and a CNT composite comprising CNTs and anionic polysaccharides or anionic glycosaminoglycans further characterized by a low cationic content and a high conductivity and/or small CNT particle size as measured by SEM.
7 Citations
18 Claims
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1. A CNT composite, comprising:
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a solid dispersion comprising CNTs and a glycosaminoglycan or polysaccharide; wherein the dispersion comprises at least 20 wt % of the glycosaminoglycan or polysaccharide; wherein the sum of Na, K, Mg, and Ca associated with the glycosaminoglycan or polysaccharide is less than 1 wt % of the dispersion; and wherein the solid dispersion possesses one or more of; a bulk conductivity of 500 S/cm or greater, and a volume average size of CNT particles, as observable by SEM, of 5 μ
m or less, where size is the largest dimension observed in the SEM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification