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Ultrathin free-standing graphene oxide film based flexible touchless sensor*    J. Semicond., 2018, 39(1): 013002.

Lin Liu1, 2, Yingyi Wang2, Guanghui Li1, Sujie Qin2, † , and Ting Zhang1, †

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Abstract: Ultrathin free-standing graphene oxide (GO) films were fabricated by vacuum filtration method assisted

with Ni(OH)2 nanosheets as the sacrifice layer. The surface of the obtained GO film is very clean as the Ni(OH)2

nanosheets can be thoroughly etched by HCl. The thickness of the GO films can be well-controlled by changing

the volume of GO dispersion, and the thinnest GO film reached ~12 nm. As a novel and transparent dielectric material, the GO film has been applied as the dielectric layer for the flexible touchless capacitive sensor which can effectively distinguish the approaching of an insulator or a conductor.

Full article: http://www.jos.ac.cn/article/doi/10.1088/1674-4926/39/1/013002?pageType=en