We all know that everything in the world requires a large amount of energy to operate, which will consume a large amount of energy. In order to further reduce energy consumption, people have strengthened research on this. Then, the thermoelectric effect What inspiration can it bring to the research and development of smart clothing? Today, many wearable biosensors, data transmitters, and similar personal health monitoring devices are highly advanced and increasingly smaller. However, these devices still require a lot of energy to operate, and the power supplies can be large and bulky. A new study from materials chemist Trisha Andrew and her doctoral student Linden Allison from the University of Massachusetts shows that they have developed a new type of fabric that can harvest body heat to power small wearable microelectronic devices such as activity trackers. Relevant research results were published in the online version of "Advanced Materials Technology". Trisha Andrew explained that in theory, body heat can use the difference between the body temperature and the surrounding cooler air to generate energy, which is a "thermoelectric effect." Materials with high electrical conductivity and low thermal conductivity can transfer charges from areas of higher temperature to areas of lower temperature in this way. Research shows that the human body can obtain a small amount of electricity during an eight-hour work day, but the special materials currently required are either expensive, toxic, or inefficient. Trisha Andrew said: "We have developed a new method to add biocompatible, flexible and lightweight polymer films to everyday cotton cloth, so that it has high enough thermoelectric properties to generate high thermovoltage and can Driving small devices to function properly." In the study, the researchers took advantage of the naturally low heat transfer properties of wool and cotton to create a thermoelectric garment that can maintain temperature gradients across an electronic device called a thermopile . The electronic device can convert heat into electricity even when worn continuously for long periods of time. This is a very realistic and feasible solution that can ensure the continuous electrical, mechanical and thermal stability of conductive materials. "Essentially, we took advantage of the fabric's basic insulating properties and solved a long-standing problem in the equipment industry," says Trisha Andrew. Specifically, they combined a conductive polymer, persistent P-doped polymer (PEDOT- Cl), made by steam printing on a high percale and a medium percale commercial cotton fabric to create all-fabric thermostacks. They then integrated this thermopile into a specially designed wearable ring, which can generate a thermal voltage greater than 20 millivolts when worn on the hand. The researchers evaluated the abrasion resistance of the PEDOT-Cl coating by rubbing or washing the coated fabrics in hot water, and also evaluated the performance of the coating through scanning electron micrographs. The results show that this coating has no cracks or delamination, and the coating will not be worn after mechanical washing. The mechanical strength of the steam-brushed PEDOT-Cl coating can be confirmed. They then measured the coating surface conductivity using a specially designed probe and found that loose fabrics exhibited higher conductivity than tight fabrics. They highlighted that the electrical conductivity of both fabrics remained essentially unchanged after rubbing and mechanical washing.

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