changes in human body temperature are the first medical diagnostic assessment for the recent on-going COVID-19 pandemic. [1,2] Some emotion-related bodily sensations can also be observed by analyzing the subtle change of body temperature. [3] Hence, it is particularly important to real-time detect human body temperature and monitor external environmental temperature change to establish a smart healthcare system and create a comfortable living condition for human beings.Numerous temperature detectors have been developed to detect temperature through certain physical parameter changes, including mercury thermometers, infrared thermometers, and flexible temperature sensors. Specifically, a mercury thermometer can accurately measure the human body temperature based on the principle of heat-expansion and cold-contraction, however, it takes a much longer time to finish the measurement, and the glass maybe easily be broken, which will pollute the environment and pose potential harm risk to the users. An infrared thermometer is a thermometer with a wide range, fast response, and high sensitivity, which infers temperature from the thermal radiation, sometimes called black-body radiation emitted by human beings. Unfavorably, it is prone to be affected by human emissivity and thus the temperature measurement accuracy is always insufficient for practical application. Alternatively, flexible temperature sensors have attracted intense interest due to their favorable proprieties, such as high sensitivity, good accuracy, fast response, and friendly interface. Benefiting from the softness with conformability, flexible temperature sensors can be directly attached to human skin with ease to record both human body temperature and external environmental temperature in a continuous and long-term manner. Flexible temperature sensors are generally divided into thermo-sensitive sensors, thermo-resistive sensors, and thermoelectric sensors according to the change of electrical resistance in conductive materials or change of surface charge in thermoelectric materials. [4,5] Temperature variations can be precisely captured and these timely information are then transmitted to the human nervous system, providing a very useful tool to sense and respond to the environmental or physiological stimuli. Consequently, flexible temperature sensors open up many promising opportunities in emerging personal healthcare, [6,7] electronic skin, [8] artificial intelligence, [5,9] and next-generation smart robots. [10] There are various constructing materials for flexible temperature sensors, such as films, [11] rubbers, [12] hydrogels, [13] and Accurate and real-time detection of human body temperature changes is crucial to understand thermal homeostasis, to access complex health conditions, and to further build a smart healthcare system. Recent years have seen temperature sensors open up many potential applications in electronic skin, artificial intelligence, and next-generation smart robots. Currently, traditional mercury and infrared thermometers are ext...

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Piezo/triboelectric nanogenerators (PTNGs) have become the research frontier in many cutting‐edge applications, which open up promising possibilities for broad prospects. Fiber materials are the ideal candidate for constructing high‐performance PTNGs owing to the compelling features of lightweight, programmable structure, favorable softness, and brilliant breathability. To this end, working mechanisms, material selections, structural designs and fabrication methods of fiber constructed PTNGs are comprehensively presented. An in‐depth analysis of emerging applications ranging from intelligent clothing, smart home, and personalized medicine to artificial intelligence is thoughtfully demonstrated. Furthermore, the current problems and potential challenges that hinder their large‐scale commercial applications are systematically discussed, laying emphasis on the future development direction of fiber constructed PTNGs. It is expected that this review will supply the audience with some universal strategies and fresh ideas to conduct deep research on fiber constructed PTNGs toward better performance.