School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China.
School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China.
J Hazard Mater. 2021 Feb 5;403:123645. doi: 10.1016/j.jhazmat.2020.123645. Epub 2020 Aug 16.
Boric acid-modified graphene oxide (GO-BA) paper is prepared by a green and facile water evaporation-induced self-assembly method, and its application as an early fire-alarm sensor is investigated. The nacre structure is constructed by assembling graphene oxide (GO) and boric acid (BA) as brick and mortar, respectively. Compared with pure GO paper, improved thermal-oxidative stability is obtained for GO-BA. GO nanosheets are bonded with BA molecules by forming hydrogen bonds between hydroxyl in BA and the rich oxygen-containing functional groups on GO. Notably, the insulating GO-BA paper can be rapidly thermally reduced to conductive reduced graphene oxide under flame exposure, thus providing an ideal fire-alarm response with a quick flame-detection time of ∼0.8 s. In addition, boron oxide formed under flame attack covers the surface of GO, inhibiting further oxidation of GO paper, and effectively extending the duration time of GO-BA under combustion. These results indicate that the GO-BA paper prepared has a broad prospect in the field of fire early-alarm.
硼酸改性氧化石墨烯（GO-BA）纸是通过一种绿色简便的水蒸发诱导自组装方法制备的，并研究了其作为早期火灾报警传感器的应用。珍珠层结构是通过将氧化石墨烯（GO）和硼酸（BA）分别作为砖和灰浆组装而成的。与纯 GO 纸相比，GO-BA 具有更好的热氧化稳定性。GO 纳米片通过 BA 分子中的羟基与 GO 上丰富的含氧官能团之间形成氢键而与 BA 分子结合。值得注意的是，在火焰暴露下，绝缘的 GO-BA 纸可以迅速被热还原为导电还原氧化石墨烯，从而提供了一种理想的火灾报警响应，火焰检测时间快至约 0.8 秒。此外，在火焰攻击下形成的氧化硼覆盖在 GO 的表面，抑制了 GO 纸的进一步氧化，并有效地延长了 GO-BA 在燃烧下的持续时间。这些结果表明，所制备的 GO-BA 纸在火灾早期报警领域具有广阔的前景。
