| With the rapid development of Internet of Things technology and social economy,smart electronic devices have attracted extensive attention,especially in the wearable field,which has been integrated into people’s work,study and daily life.However,there are still many problems in the compatibility of comfort and sensor intelligence in traditional wearable smart devices,which leads to the bulky,airtight and uncomfortable devices,and the real flexible wearable cannot be realized.In addition,due to excessive dependence on fossil energy such as oil and coal and excessive exploitation of non-renewable resources,energy crisis and environmental pollution problems have become huge obstacles restricting the sustainable development of society in the future.Triboelectric nanogenerator(TENG),which has the advantages of wide material selectivity,simple structure and high energy conversion efficiency,is considered as one of the important solutions to solve the above problems.Triboelectric nanogenerator can transform the scattered mechanical energy that is not paid attention to in life into electrical energy that can be directly used by electrical appliances through the coupling effect between triboelectrification,electrostatic induction and displacement current,which is an important way to solve the problem of current energy exhaustion.Combining triboelectric nanogenerator with textile science,weaving textile based triboelectric nanogenerator(t-TENG)is also one of the effective ways to prepare wearable devices with excellent comfort performance.Terry fabric is a kind of common textile fabric,which has excellent comfortable performance and has been widely used in the field of wearing and decorative textiles.Compared with other textile fabrics,the terry fabric has a higher specific surface area,so it has a stronger triboelectric effect as a friction material,and is an excellent raw material for the preparation of textile based triboelectric nanogenerator.However,the research on the influence of the shape and structure of the loop on the triboelectric output performance and the mechanism of action is still very short.Based on the discussion above,this topic with double warp knitted towel fabric as the research object,by controlling the transverse distance of the guide bar to change the fabric loop height,explores the loop height change on the loop on the friction generator use comfortable performance and friction power output performance influence,and the preparation of a kind of triboelectric based smart warp knitting terry fabric,Its usability in the field of motion monitoring and energy harvesting has been tried.The specific experimental results are as follows:(1)Four kinds of double side warp knitted towel fabrics with different loop height were prepared by controlling the traversal distance of the guide bar and changing the fabric structure.The six properties of four kinds of towel fabrics with different height of loop were tested,such as weight,thickness,wear resistance,water absorption,air permeability and heat preservation,and it was found that the height of loop had great influence on the six properties of fabric.With the increase of the loop height of the fabric,the thickness,weight,water absorption and heat preservation of the fabric are increased correspondingly,while the wear resistance and air permeability of the fabric are decreased.(2)A kind of warp knitted loop smart fabric(M-TENG)based on film material was prepared by using double side warp knitted towel fabric,PTFE film and aluminum foil as materials.By testing the open circuit voltage,short circuit current and short circuit charge of M-TENG under different applied pressure,working frequency,applied load resistance and working time,the tribrielectric output performance of M-TENG in vertical contact-separation mode and lateral-sliding mode is explored.The experimental results show that M-TENG has:(1)Sensitive pressure responsiveness,and the pressure sensitivity is about 2.93 in vertical contact-separation mode.(2)It has high output power density.In the vertical contact-separation working mode,when the resistance value of the external resistance is 300 MΩ,the tribrielectric output power density of M-TENG is the largest,reaching about 7.7 m W/m~2.In the lateral-sliding operation mode,when the resistance value of the external resistance is 1GΩ,the triboelectric output power density of M-TENG is the maximum,which is about 8.38m W/m~2.(3)Excellent triboelectric output stability,after continuous vertical contact-separation work 10000 times or lateral-sliding 2500 times still has a relatively stable triboelectric output.(3)Based on M-TENG,the influence of the change of the height of loop on the triboelectric output performance of M-TENG is explored.The experimental results show that when the height of loop increases,the triboelectric output performance of M-TENG in vertical contact-separation mode and lateral-sliding mode decreases.In this paper,the reason for this phenomenon is analyzed through theoretical analysis and experimental exploration:when the height of loop increases,the triboelectrification charge density of M-TENG does not change,while the thickness of the dielectric material increases,and the electrostatic induction between the electrodes weakens,resulting in the decline of the the triboelectric output performance of M-TENG.In addition,this topic also explores the influence of loop spacing and loop compression recovery distance on the triboelectric output performance of M-TENG.It is found that:(1)When the loop spacing is less than the loop height,the loop height has no effect on the triboelectric output performance of M-TENG.(2)When the loop spacing is greater than the loop height,the triboelectric output performance of M-TENG increases with the increase of the loop height.(3)When the distance of loop compression recovery increases,the charge amount of loop triboelectrification remains unchanged and the contact-separation time increases,so the current of M-TENG decreases in vertical contact-separation working mode.(4)A fabric based warp knitted terry smart fabric(TF-TENG)was prepared using double side warp knitted towel fabric,PTFE fabric and silver coated nylon fabric as raw materials,and the triboelectric output performance of TF-TENG was investigated under different applied pressure,working frequency and applied load resistance conditions.The experimental results show that TF-TENG has:(1)Sensitive pressure responsiveness,the pressure sensitivity in vertical contact-separation mode is about 1.71,slightly less than the pressure sensitivity of M-TENG.(2)It has a high output power density.In the vertical contact-separation working mode,when the resistance value of the external resistance is 300 MΩ,the triboelectric output power density of M-TENG is the maximum,reaching about 1.1 m W/m~2,slightly less than the maximum triboelectric output power density of M-TENG.However,in the lateral-sliding working mode,when the resistance value of the external resistance is 1 GΩ,the triboelectric output power density of M-TENG is the maximum,which can reach about 9.99 m W/m~2,slightly greater than the maximum triboelectric output power density of M-TENG.(5)By placing TF-TENG on the underarm and sole of the foot of the human body to monitor human movement,the motion state and frequency of human movement when walking slowly,running fast and jumping were successfully identified.In addition,the TF-TENG in lateral-sliding mode is used to power and charge 496 series LED lights,common commercial calculators and capacitors of different capacitance sizes under manual drive.Experiments prove the feasibility of TF-TENG in the field of human motion monitoring and energy collection. |
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