Jiang Hao-Bo, Liu Yan, Liu Juan, Li Shu-Yi, Song Yun-Yun, Han Dong-Dong, Ren Lu-Quan
Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun, China.
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, China.
Front Chem. 2019 Jun 27;7:464. doi: 10.3389/fchem.2019.00464. eCollection 2019.
Here, we reported an ingenious fabrication of moisture responsive graphene-based actuator via unilateral two-beam laser interference (TBLI) treatment of graphene oxide (GO) papers. TBLI technique has been recognized as a representative photoreduction and patterning strategy for hierarchical structuring of GO. The GO paper can be reduced and cut into grating-like periodic reduced graphene oxide (RGO) microstructures due to laser ablation effect. However, the lower light transmittance of the thick GO paper and the corresponding thermal relaxation phenomenon make it impossible to trigger complete reduction, leading to the formation of the anisotropic GO/reduced GO (RGO) bilayer structure. Interestingly, the RGO side that feature lower OCGs and higher roughness shows strong water adsorption due to the formation of micronanostructures. Due to the different water adsorption capacities of the two sides, a flower moisture-responsive actuator has been fabricated, which exhibits "opening" and "closing" behavior under different humidity conditions.
在此，我们报道了一种通过对氧化石墨烯（GO）纸进行单边双光束激光干涉（TBLI）处理来巧妙制造湿度响应型石墨烯基致动器的方法。TBLI技术已被公认为是用于GO分层结构的代表性光还原和图案化策略。由于激光烧蚀效应，GO纸可以被还原并切割成光栅状的周期性还原氧化石墨烯（RGO）微结构。然而，厚GO纸较低的透光率以及相应的热弛豫现象使得无法引发完全还原，从而导致形成各向异性的GO/还原氧化石墨烯（RGO）双层结构。有趣的是，具有较低含氧量基团（OCGs）和较高粗糙度的RGO面由于微米纳米结构的形成而表现出强烈的水吸附作用。由于两侧的水吸附能力不同，制造出了一种花朵状湿度响应型致动器，它在不同湿度条件下呈现出“打开”和“关闭”行为。
