(29i) Near-Infrared Light-Responsive Poly(N-isopropylacrylamide)/Graphene Oxide Nanocomposite Hydrogels with High Elasticity

Shi, K., Sichuan University
Liu, Z., Sichuan University
Chu, L., Sichuan University
Xie, R., Sichuan University
Ju, X. J., Sichuan University
Wang, W., Sichuan University

Novel near-infrared light-responsive poly(N-isopropylacrylamide)/graphene oxide (PNIPAM-GO) nanocomposite hydrogels with high elasticity have been successfully developed. The combination of graphene oxide (GO) and temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) materials provides the hydrogels with near-infrared light-responsive property, because the GO materials could effectively generate photo-thermal heat due to their high optical absorbance in the near-infrared region. The high elasticity property of the PNIPAM-GO nanocomposite hydrogels is achieved by using very low concentration of N,N'-methylenebisacrylamide molecules as chemical cross-linkers and GO nano-sheets as physical cross-linkers. The low concentration of chemical cross-linker results in flexible polymer chains and GO nano-sheets toughen the hydrogels by hydrogen bond connection. Moreover, the GO nano-sheets in the hydrogel networks could dissipate the energy, making the hydrogels extremely stretchable. Because near-infrared light is a particularly attractive stimulus with easily adjustable intensity and wavelength perfectly used for remote controlling, the proposed PNIPAM-GO nanocomposite hydrogels with high elasticity are highly promising material candidates for responsive valves, actuators, artificial muscles, and so on.