Abstract
In recent years, the development and research of flexible sensors have gradually deepened, and the performance of wearable, flexible devices for monitoring body temperature has also improved. For the human body, body temperature changes reflect much information about human health, and abnormal body temperature changes usually indicate poor health. Although body temperature is independent of the environment, the body surface temperature is easily affected by the surrounding environment, bringing challenges to body temperature monitoring equipment. To achieve real-time and sensitive detection of various parts temperature of the human body, researchers have developed many different types of high-sensitivity flexible temperature sensors, perfecting the function of electronic skin, and also proposed many practical applications. This article reviews the current research status of highly sensitive patterned flexible temperature sensors used to monitor body temperature changes. First, commonly used substrates and active materials for flexible temperature sensors have been summarized. Second, patterned fabricating methods and processes of flexible temperature sensors are introduced. Then, flexible temperature sensing performance are comprehensively discussed, including temperature measurement range, sensitivity, response time, temperature resolution. Finally, the application of flexible temperature sensors based on highly delicate patterning are demonstrated, and the future challenges of flexible temperature sensors have prospected.
Highlights
All life activities of the human body based on metabolism and relatively constant body temperature is necessary for a healthy metabolism [1]
Specific stretch and stretch characteristics to adapt to the adhesion on the human body surface, common flexible substrates are usually processed into a film, such as polydimethylsiloxane (PDMS) [17–20], polyimide (PI) [21, 22], polyurethane (PU) [23], polyethylene terephthalate (PET) [24, 25], polyvinyl alcohol(PVA) [26], polyvinyl butyral(PVB) [27], paper [28, 29], silicone rubber [5, 30, 31], and more skin-friendly biodegradable materials can be used, such as pectin [32], cotton, silk [33], and other cellulose materials [34, 35]
The current temperature sensor response time can be within a few milliseconds, but there is a problem of too long reset time
Summary
All life activities of the human body based on metabolism and relatively constant body temperature is necessary for a healthy metabolism [1]. Hyperthermia or hypothermia will affect the activity of enzymes in the body, thereby affecting the regular operation of human metabolism, causing disorders of various cells, tissues and organs, and even death in severe cases. Flexible temperature sensors have been developing towards wearable, highly sensitive, portable, large-area, accurate, and real-time trends. Su et al Nanoscale Res Lett (2020) 15:200 to realize the real-time monitoring of the temperature [4]. It uses the character of the flexible substrate to adhere strictly to the skin to realize its function. In order to solve the above problems, wearable flexible, thin and sensitive patterned temperature sensors have become a research hotspot for scientific researchers
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