材料科学
石墨烯
燃烧性
烟雾
燃烧
点火系统
氧化物
纳米技术
复合材料
法律工程学
环境科学
废物管理
化学
工程类
航空航天工程
冶金
有机化学
作者
Hui Xu,Yang Li,Neng-Jian Huang,Zhi-Ran Yu,Peng-Huan Wang,Zhaohui Zhang,Qiao-Qi Xia,Li‐Xiu Gong,Shi‐Neng Li,Li Zhao,Guodong Zhang,Long‐Cheng Tang
标识
DOI:10.1016/j.jhazmat.2018.09.082
摘要
Fire prevention and safety of combustible materials is a global challenge. To reduce their high fire risk, traditional smoke detectors are widely used indoor via detecting smoke product after combustion; however, they usually show a long response time and limitation for outdoor use. Herein, we report a temperature-induced electrical resistance transition of graphene oxide wide-ribbon (GOWR) wrapped sponges to reliably monitor fire safety of the combustible materials. Novel rectangle-like GOWR sheets are synthesized from unzipping carbon nanofibers and used to fabricate GOWR wrapped melamine formaldehyde sponges with multi-functionalities, e.g. lightweight, good hydrophobicity, reversible compressibility, excellent acidic/alkaline tolerance and flame resistance. The GOWR sheets on the sponge skeleton can be in-situ thermally reduced once encountering a flame attack or abnormal high temperature, inducing a distinct transition in electrical resistance. Consequently, an ultrafast alarm response of ∼2 s to flame attack is triggered, and rapid fire early warning signals to abnormal high temperatures, e.g. ∼33 s at 300 °C, are achieved below ignition temperature of most combustible materials. This method drives substantial motivation and opportunity to develop advanced fire detection and early warning sensors for reducing the high fire risk of various combustible materials in outdoor applications.
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