Abstract
Liquid-phase exfoliation (LPE) of transition metal dichalcogenide (TMD) nanosheets is a facile, cost-effective approach to large-area photoelectric devices including photodetectors and non-volatile memories. Non-destructive exfoliation of nanosheets using macromolecular dispersing agents is advantageous in rendering the TMD nanocomposite films appropriate for mechanically flexible devices. Here, an efficient LPE of molybdenum diselenide (MoSe2) with zwitterionic detergents is demonstrated, the exfoliation of nanosheets was facilitated through electrostatic repulsion between detergent-coated TMD nanosheets. The results demonstrate that the exfoliation depends upon both the number of alkyl chains and the concentration of the zwitterionic detergents. Under optimized conditions of number of alkyl chains and its concentration, zwitterionic detergents gave rise to a highly concentrated MoSe2 nanosheet suspension that was stable for over 1 month. Exfoliation of several other TMDs was also achieved using the zwitterionic detergents, indicating the scope of applications. Moreover, a zwitterionic detergents/MoSe2 suspension could use a inkjet-prinitable ink, a flexible composite film of zwitterionic detergents and MoSe2 nanosheets was fabricated by inkjet-printing. It showed outstanding photoconductive performances including a high Ion/Ioff ratio of 104.
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