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Keywords:

  • poly(N-isopropylacrylamide) (PNIPAM);
  • graphene oxide;
  • γ-irradiation polymerization;
  • microvalves
Thumbnail image of graphical abstract

Nanocomposite materials can turn temperature-responsive hydrogels into light-activated ones. On page 4017, Jia-Fu Chen, Shu-Hong Yu, and co-workers report the synthesis of a photothermally sensitive poly(N-isopropylacrylamide)/graphene oxide (PNIPAM/GO) nanocomposite hydrogel on the macroscopic scale using in situ gamma-irradiationassisted polymerization. The swelling–shrink transition of the nanocomposite hydrogels can be controlled via near-infrared (NIR) laser exposure or non-exposure, demonstrating potential applications as controlled liquid microvalves.