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.

中文翻译：

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模仿狗的鼻子：滚动石墨烯纳米片

受狗鼻子内部密集覆盖的毛细血管结构的启发，我们报告了一种人造纳米结构，即。e。，poly（sodium p-苯乙烯磺酸盐）功能化的还原氧化石墨烯纳米卷（PGNS），具有高度的结构完善性和高效的气体传感应用。引入了一种简便的超分子组装体，以利用功能性聚合物对石墨烯进行功能化，并结合了冻干技术，将基于石墨烯的平面纳米片大量转化为纳米卷。详细的特征表明，受生物启发的纳米卷具有宽阔的管状形态，尺寸均匀，与先前报道的结构不同。通过冷冻-SEM监测在冷冻干燥的每个滚动阶段中基于石墨烯的纳米片的详细形态。这阐明了不对称聚合物诱导的石墨烯滚动机理，包括相应的滚动过程，这是通过分子动力学模拟直接给出的。制成的PGNS传感器具有卓越的气体传感性能，可靠的重复性，出色的线性灵敏度，尤其是超高响应性（R _a / R _g＝ 5.39，10ppm）朝向NO ₂。超分子组装与冻干技术相结合以制造PGNS，为设计用于气体传感器和化学痕量检测器的仿生材料提供了一种策略。