1. Article overview
In the era of the Internet of Things, there is an urgent need for multifunctional intelligent fireproof cotton fabrics. Recently, the research team of teachers Xingrong Zeng and Xuejun Lai of South China University of Technology used an eco-friendly layer-by-layer assembly method to coat MXene nanosheets and carboxymethyl chitosan (CCS) on the fabric, thereby developing a temperature-sensitive, fire-resistant A new type of fireproof and safe cotton fabric (called MXene/CCS@CF) with piezoresistance and Joule heating properties. Related research work was published on the internationally renowned academic journal ACS Applied Materials & Interfaces (IF=8.758) with the title "Multifunctional MXene/Chitosan-Coated Cotton Fabric for Intelligent Fire Protection". What are the application prospects of materials with high temperature resistance and flame retardant functions? This work gives an answer. In practical applications, circuits and other electronic devices integrated with the material should also have high temperature resistance, and we look forward to subsequent development.
In this work, thanks to the thermoelectric properties and high conductivity of MXene nanosheets, MXene/CCS@CF has accurate and wide-range temperature sensing performance. When burning, the fabric will repeatedly trigger the fire warning system in less than 10 seconds. More importantly, due to the synergistic carbonization between MXene and CCS, MXene/CCS@CF has excellent flame retardancy. After the vertical combustion test, the limiting oxygen index of MXene/CCS@CF is as high as 45.5%, and the coke length is only 33 mm. At the same time, its peak heat release rate has been reduced by more than 66%. In addition, the obtained fabric can detect various human movements. In addition, the controllable Joule heating performance allows the fabric to be used in extremely cold weather. This work provides a simple method for manufacturing the next generation of highly fireproof and safe cotton fabrics, and demonstrates the application prospects in fire protection, home automation and intelligent transportation.

Two, graphic guide


Solution 1. MXene/CCS@CF design strategy; MXene/CCS@CF application diagram, including temperature sensing, fire warning, flame retardancy, piezoresistive sensing and Joule heating performance.


Figure 2. (a) Conductivity of MXene/CCS@CF with different CCS content.
The real-time resistance change (b) is within a different strain range of 1.5% to 4.5%, and different applications are simulated (c) tapping, (d) finger bending, (e) wrist bending and (f) walking.
The results show that MXene/CCS@CF can monitor various human movements, thereby providing feedback on human health information and equipment operating conditions.


Figure 3. (a) Voltage-current curve, (b) Joule heating performance of MXene/CCS@CF-4.
(C) Time-temperature curve of the cyclic electric heating performance of MXene/CCS@CF-4 at 3.5 V.
(D) Snapshots of 30, 60, 90 and 120 s thermal imaging cameras of MXene/CCS@CF-4 at 3.5 V.
The results show that the controllable Joule heating allows MXene/CCS@CF to be used in extremely cold weather to keep warm.

3. Thesis information

Multifunctional MXene/Chitosan-Coated Cotton Fabric for Intelligent Fire Protection
ACS Applied Materials & Interfaces (IF=8.758)
Pub Date: 2021-05-05
DOI: 10.1021/acsami.1c05222
Binglin Wang, Xuejun Lai, Hongqiang Li, Changcheng Jiang, Jiefeng Gao, Xingrong Zeng*
School of Materials Science and Engineering, Key Lab of Guangdong Province for High Property and Functional Polymer Materials, South China University of Technology, No 381, Wushan Road, Tianhe District, Guangzhou 510640, China