Preparation,structure And Properties Of MXene Modified Polyester-based Multifunctional Wearable Heated Textiles

Resistive wearable heaters have received a lot of attention in the fields of personal thermal management and healthcare because of their stable and safe electrical heating effect.Currently,resistive heaters with polymer textiles backing not only retain the inherent flexibility and breathability of the textiles,but also have good electrical heating effect under deformation conditions.However,resistive wearable heaters usually require an external power supply to achieve heating,limiting their application in the field of portable electronic devices.At the same time,the increasingly complex operating environment puts higher demands on the functional characteristics of polymer wearable heaters such as flame retardant,electromagnetic shielding,and antibacterial.Therefore,it is of great significance to develop a polymer wearable heater with multiple energy-driven heating and multifunctional integrationTwo-dimensional transition metal carbides or nitrides(MXene)has been widely used in the field of polymer textile based resistance heaters due to its excellent conductivity and photothermal conversion properties.However,it still has some disadvantages,such as relatively low heating efficiency,single heating energy,poor wearability and poor protection performance,which seriously limit its practical applications.Based on this,this paper uses simple impregnation technique to modify MXene on the surface of polyester textile to prepare a wearable heater with dual optical/electrical drive as well as self-powered heating,and simultaneously integrates functional properties such as flame retardant,electromagnetic shielding,and antibacterial.The main research is as follows:1.MXene nanosheets were uniformly coated on the surface of alkali-treated PET textile by solution impregnation to produce MXene modified polyester textile(M-textile).The strong hydrogen bonding interaction between MXene and the polymer matrix made MXene firmly distributed on the textile fiber surface,showing excellent water resistance,while maintaining the good air permeability and flexibility of the polymer textile.The M-textile exhibited excellent heating performance driven by both light and electricity,including fast thermal response,wide temperature range,high thermal stability,safe operation,high sensitivity,and long-time cyclic heating.In particular,the temperature of the M-textile can be increased up to 151 °C when 3 V is applied and up to 204 °C when driven by a near-infrared laser light.At the same time,the M-textile exhibited excellent flame retardant,antibacterial and electromagnetic shielding properties.The electromagnetic shielding effectiveness of the M-textile with 17.3 wt% of MXene was 42.1 d B.The resulting multifunctional M-textile based wearable heater had broad application prospects in the fields of personal thermal management,heat therapy,de-icing,water heating,electromagnetic shielding,flame retardant and antibacterial,etc.It was an ideal choice for personal health management and protection in the future.2.Based on the principles of friction initiation and electrostatic induction,the fully textile-based triboelectric nanogenerator(M-textile TENG)was constructed with conductive M-textile as the back electrode material and polydimethylsiloxane as the friction negative layer material.The M-textile TENG had excellent output electrical performance and various practical functions.When rubbed with nylon fabric under the operating conditions of 8 Hz and 10 N,the open-circuit voltage and short-circuit current of the M-textile TENG were 57 V and 0.91 ?A,laying the foundation for the construction of a self-energy-supplying heater.3.Based on the solution alternating impregnation technique,MXene@Ag NW hybrid modified polyester textile(AM-textile)was produced by alternately modifying one-dimensional Ag NW and two-dimensional MXene on the surface of a common polyester textile.The three-dimensional conductive network structure co-constructed by one-dimensional Ag NW and two-dimensional MXene endowed AM-textile with high electrical conductivity and excellent electrical and optical heating properties.The temperature of AM-textile can be raised to 174 °C when 3 V was applied and224 °C when driven by NIR laser light,while AM-textile exhibited multiple protective properties such as excellent electromagnetic shielding,antibacterial and flame retardant.In addition,the frictional electrical performance of the triboelectric nanogenerator using AM-textile as electrode was improved compared with that of M-textile triboelectric nanogenerators,and the open-circuit voltage and short-circuit current of AM-textile TENG can be reached 62 V and 0.98 ?A,respectively,under the operating conditions of 8 Hz and 10 N.Moreover,the electrical signal of about 15?A can be transformed when collecting the energy of small human movements.It had great potential for applications in the field of multifunctional wearable heaters and self-powered electronic devices.