Mimicking a Dog's Nose: Scrolling Graphene Nanosheets
Mimicking a Dog's Nose: Scrolling Graphene Nanosheets
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模仿狗的鼻子：滚动石墨烯纳米片
DOI：
10.1021/acsnano.7b08294
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发表时间：
2018-03-01
期刊：
影响因子：
17.1
通讯作者：
Zhou, Guofu
中科院分区：
文献类型：
--
作者：
Chen, Zhuo;Wang, Jinrong;Zhou, Guofu
受狗鼻子内密集覆盖的毛细血管结构的启发，我们报告了一种人工纳米结构，即，聚（对苯乙烯磺酸钠）官能化的还原氧化石墨烯纳米卷（PGNS），具有高度的结构完美性和高效的气体传感应用。一个简单的超分子组装引入功能聚合物功能化石墨烯，结合冻干技术，大量转化平面石墨烯基纳米片纳米卷。详细的表征表明，bioinspired nanoscroll表现出宽开放的管状形态，具有均匀的尺寸，在结构上不同于先前报道的。通过低温SEM监测冻干过程中每个滚动阶段中石墨烯基纳米片的详细形态。这揭示了一个不对称的聚合物诱导的石墨烯滚动机制，包括相应的滚动过程，这是直接提出的分子动力学模拟。所制造的PGNS传感器表现出上级的气敏性能，具有可靠的重复性，优良的线性灵敏度，特别是，对NO2的响应（Ra/Rg = 5.39，10 ppm）。超分子组装结合冷冻干燥技术制备PGNS为设计仿生材料用于气体传感器和化学痕量检测器提供了一种策略。
Inspired by the densely covered capillary structure inside a dog's nose, we report an artificial nanostructure, i.e., poly(sodium p-styrenesulfonate)-functionalized reduced graphene oxide nanoscrolls (PGNS), with high structural perfection and efficient gas sensing applications. A facile supramolecular assembly is introduced to functionalize graphene with the functional polymer, combined with the lyophilization technique to massively transform the planar graphene-based nanosheets to nanoscrolls. Detailed characterizations reveal that the bioinspired nanoscrolls exhibit a wide-open tubular morphology with uniform dimensions that is structurally distinct from the previously reported ones. The detailed morphologies of the graphene-based nanosheets in each scrolling stage during lyophilization are monitored by cryo-SEM. This unravels an asymmetric polymer-induced graphene scrolling mechanism including the corresponding scrolling process, which is directly presented by molecular dynamics simulations. The fabricated PGNS sensors exhibit superior gas sensing performance with reliable repeatability, excellent linear sensibility, and, especially, an ultrahigh response (R-a/R-g = 5.39, 10 ppm) toward NO2. The supramolecular assembly combined with the lyophilization technique to fabricate PGNS provides a strategy to design biomimetic materials for gas sensors and chemical trace detectors.