用于智能设备的偶氮苯改性氧化石墨烯/聚乙烯醇复合膜的多光致弯曲,ACS Applied Nano Materials

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用于智能设备的偶氮苯改性氧化石墨烯/聚乙烯醇复合膜的多光致弯曲
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-09-20 , DOI: 10.1021/acsanm.1c01671
Tingting Xu ₁ , Sufang Guo ₁ , Miaomiao Li ₁ , Zhen Zhang ₁ , Baobao Pang ₁ , Yingmo Hu ₁

Affiliation

在这里，我们报告了一种复合薄膜，该薄膜在紫外/可见光 (UV/vis) 和近红外 (NIR) 光照射下显示出多弯曲行为。首先，通过将4-（3-三乙氧基甲硅烷基丙基-脲基）偶氮苯（TSUA）共价接枝到GO表面上，制备了偶氮苯改性氧化石墨烯（AZO-GO）杂化物。在紫外/可见光照射下观察到 AZO-GO 亲水性的可逆变化，这是由于有效的反式-顺式-偶氮苯基团的光异构化。然后，将 AZO-GO 杂化粉末分散在乙醇中，并与聚乙烯醇 (PVA) 水溶液均匀混合，通过浇铸得到均匀薄的复合膜 (AZO-GO/PVA)，具有良好的柔韧性。在紫外线照射下，由于可逆的反式-顺式，该薄膜以较大的幅度向光源快速弯曲，并在随后的可见光照射下恢复到原始形状-偶氮苯基团的光异构化。在 NIR 照射下，薄膜远离光源略微卷曲，这被认为是由 GO 组件的光热效应引起的。这种复合薄膜成本低，制造简单，具有增强的机械性能。最后，通过组合三片复合膜，模拟了爪在紫外线/可见光照射下的可逆抓取-释放运动。

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Multiphotoinduced Bending of Azobenzene-Modified Graphene Oxide/Poly(vinyl alcohol) Composite Films for Smart Devices

Here, we report a composite film that shows multibending behaviors upon ultraviolet/visible (UV/vis) and near-infrared (NIR) light irradiations. First, an azobenzene-modified graphene oxide (AZO-GO) hybrid was prepared by the covalently grafting of 4-(3-triethoxysilylpropyl-ureido)azobenzene (TSUA) onto the surface of GO. A reversible change in the hydrophilicity of AZO-GO was observed upon UV/vis irradiations, due to the effective trans–cis-photoisomerization of azobenzene groups. Then, the AZO-GO hybrid powder was dispersed in ethanol and homogeneously mixed with the poly(vinyl alcohol) (PVA) aqueous solution to give a uniform and thin composite film (AZO-GO/PVA) with good flexibility by casting. Upon UV irradiation, this film bends rapidly toward the light source with a large amplitude and recovers to the original shape upon subsequent visible irradiation, due to the reversible trans–cis-photoisomerization of azobenzene groups. Upon NIR irradiation, the film curls slightly away from the light source, which is considered to be caused by the photothermal effect of the GO component. This composite film is also low-cost and uses facile manufacturing, with enhanced mechanical properties. Finally, by combining three pieces of the composite films, mimicking the reversible grabbing–release motions of a claw upon UV/vis irradiation was achieved.

更新日期：2021-10-22

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