The responsive hydrogels have received great attention in many fields. However, the molding method and response mode of such hydrogels are criticized when it comes to real applications. In this work, a novel class of poly(N‐isopropyl acrylamide)/graphene oxide (PNIPAm/GO) nanocomposite hydrogel through self‐assembly three‐dimensional (3D) printing via ultraviolet light polymerization. The precursor is ordinarily constituted by NIPAm monomer, crosslinker, and water mixed with a photoinitiator, besides the introduction of nanoclay adjusts the shear thinning properties to an optimal level, which is important for the 3D printing precision. Then, the graphite oxide as infrared light absorber endows the hydrogel fast photothermal excited responsivity instead of conventional temperature response. The shrinkage and swelling of the composite hydrogel can be controlled by turning the near‐infrared light on or off. Meanwhile, the reversible behavior of as‐prepared hydrogel is easily regulated by altering the content of GO and illumination time of near‐infrared light. Additionally, a round tube is obtained based on the as‐prepared hydrogel, which can be driven to get a pencil, indicating their potential applications in actuator and other functional program.

中文翻译：

---

通过3D打印制备光热响应性纳米复合水凝胶

反应性水凝胶在许多领域都受到了极大的关注。然而，在实际应用中，这种水凝胶的成型方法和响应方式受到批评。在这项工作中，一类新颖的poly（N异丙基丙烯酰胺）/氧化石墨烯（PNIPAm / GO）纳米复合水凝胶，通过紫外线聚合进行自组装三维（3D）打印。前体通常由NIPAm单体，交联剂和水与光引发剂混合而成，此外，纳米粘土的引入将剪切稀化性能调节到最佳水平，这对3D打印精度至关重要。然后，作为红外光吸收剂的氧化石墨赋予水凝胶快速的光热激发响应性，而不是常规的温度响应。可以通过打开或关闭近红外光来控制复合水凝胶的收缩和溶胀。同时，通过改变GO的含量和近红外光的照射时间，可以很容易地调节所制备的水凝胶的可逆行为。