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Fire Alarm Wallpaper Based on Fire-Resistant Hydroxyapatite Nanowire Inorganic Paper and Graphene Oxide Thermosensitive Sensor
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posted on 2018-03-13, 00:00 authored by Fei-Fei Chen, Ying-Jie Zhu, Feng Chen, Li-Ying Dong, Ri-Long Yang, Zhi-Chao XiongWallpaper
with multiple functions, such as fire resistance and
an automatic alarm in fire disasters, will be attractive for the interior
decoration of houses. Herein, we report a smart fire alarm wallpaper
prepared using fire-resistant inorganic paper based on ultralong hydroxyapatite
nanowires (HNs) and graphene oxide (GO) thermosensitive sensors. At
room temperature, the GO thermosensitive sensor is in a state of electrical
insulation; however, it becomes electrically conductive at high temperatures.
In a fire disaster, high temperature will rapidly remove the oxygen-containing
groups of GO, leading to the transformation process of GO from an
electrically insulated state into an electrically conductive one.
In this way, the alarm lamp and alarm buzzer connected with the GO
thermosensitive sensor will send out the alerts to people immediately
for taking emergency actions. After the surface modification with
polydopamine of GO (PGO), the sensitivity and flame retardancy of
the GO thermosensitive sensor are further improved, resulting in a
low responsive temperature (126.9 °C), fast response (2 s), and
sustained working time in the flame (at least 5 min). Compared with
combustible commercial wallpaper, the smart fire alarm wallpaper based
on HNs and GO (or PGO) is superior owing to excellent nonflammability
and high-temperature resistance of HNs, which can protect the GO (or
PGO) thermosensitive sensor from the flames. The smart fire alarm
wallpaper can be processed into various shapes, dyed with different
colors, and printed with the commercial printer and thus has promising
applications in high-safety interior decoration of houses.