Kim Dowan, Lee Heon Sang, Yoon Jinhwan
Department of Chemistry, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 49315, Republic of Korea.
Department of Chemical Engineering Dong-A University, 37 Nakdong-Daero 550beon-gil, Saha-gu, Busan 49315, Republic of Korea.
Sci Rep. 2016 Feb 11;6:20921. doi: 10.1038/srep20921.
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.
为避免还原氧化石墨烯（rGO）在水溶液中重新堆叠的问题，通过对分散在水凝胶基质中的氧化石墨烯（GO）进行化学还原，制备了包含rGO的光响应性聚（N-异丙基丙烯酰胺）（PNIPAm/rGO）。由于rGO的光热效率提高，制备的PNIPAm/rGO在适度强度的可见光照射下体积大幅减小。关于潜在应用，制备了由PNIPAm/rGO活性层和聚（丙烯酰胺）被动层组成的双层型光致动器；这些光致动器在可见光照射下实现了完全弯曲运动。调节初始状态下各层的溶胀率，得到了能呈现由内向外翻转的主动运动的双向光致动器。此外，我们证明了所制备的致动系统在太阳辐射下会表现出可控的弯曲运动。
