期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 11, 页码 13790-13800出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02340
关键词
graphene; composite materials; nitrocellulose; fire alarm; temperature sensors; warning response
资金
- Electron Microscopy Center and Raman suite at The University of Manchester
Tunable temperature alarm sensors prepared using multilayer graphene and nitrocellulose can reliably monitor early high temperature risks. The sensors have a quick response time and superior flame retardancy property, and the response temperature and time can be adjusted by tuning the graphene/NC ratios to reduce fire risk in different scenarios.
Tunable temperature alarm sensors were prepared using multilayer graphene and nitrocellulose (NC) to reliably monitor early high temperature risks. The graphene/NC alarm sensor keeps in a state of electrical insulation, however, turns electrically conductive at high temperatures, such as encountering a flame attack. Its response time is limited to only a few seconds because of a quick chemical reaction of NC. The 90% graphene/NC (wt % ratio 1:9) composite alarm sensor stably remains insulated at an ambient temperature of 200 degrees C, resulting in a satisfactory responsive temperature (232 degrees C), instant response time (4.4 s), and sustained working time in the flame below the ignition temperature of most combustibles. Furthermore, the response temperature and time of the alarm sensor can be tuned by graphene/NC ratios to reduce the fire risk of various combustible materials in different fire-prone scenarios and thus has promising applications in both indoor and outdoor environments. The sensor has also proven to work in the form of paint, wallpaper, and other composites due to its superior flame retardancy property, as well as under extreme conditions (i.e., underwater and vacuum).
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