title: Highly bendable bilayer-type photo-actuators comprising of reduced graphene oxide dispersed in hydrogels.
abstract: To avoid the problem of reduced graphene oxide (rGO) restacking in aqueous solution, the preparation of light-responsive poly(N-isopropylacrylamide) incorporating rGO (PNIPAm/rGO) was achieved by the chemical reduction of GO dispersed in the hydrogel matrix. Due to the enhanced photothermal efficiency of the rGO, the prepared PNIPAm/rGO underwent large volume reductions in response to irradiation by visible light of modest intensity. With respect to potential applications, bilayer-type photo-actuators comprising a PNIPAm/rGO active layer and poly(acrylamide) passive layer were fabricated; these achieved a full bending motion upon visible-light exposure. Adjusting the swelling ratio of each layer in the initial state yielded bidirectional photo-actuators that showed the active motion of turning inside out. Furthermore, we demonstrated that the fabricated actuation system would exhibit controlled bending motion in response to solar radiation.
authors: Department of Chemistry, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 49315, Republic of Korea.
authors: Dowan
authors: D
authors: Kim
authors: Department of Chemical Engineering Dong-A University, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 49315, Republic of Korea.
authors: Heon Sang
authors: HS
authors: Lee
authors: Department of Chemistry, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 49315, Republic of Korea.
authors: Jinhwan
authors: J
authors: Yoon