Triode-Mimicking Graphene Pressure Sensor with Positive Resistance Variation for Physiology and Motion Monitoring

Abstract

The flexible pressure sensor is one of the essential components of the wearable device, which is a critical solution to the applications of artificial intelligence and human−computer interactions in the future. Due to its simple manufacturing process and measurement methods, research related to piezoresistive mechanical sensors is booming, and those sensors are already widely used in industry. However, existing pressure sensors are almost all based on negative resistance variations, making it difficult to reach a balance between the sensitivity and the detection range. Here, we demonstrated a low-cost flexible pressure sensor with a positive resistance−pressure response based on laser scribing graphene. The sensor can be customized and modulated to achieve both an ultrahigh sensitivity and a broad detection range. Furthermore, the device possesses the signal amplification property like a mechanical triode under the external pressure bias. Based on its amplification ability, varieties of physiological signals and human movements have been detected using our devices; then, an integrated gait monitoring system has been realized. The reported positive graphene pressure sensor has outstanding capability, showing a wide application range such as intelligent perception, an interactive device, and real-time health/motion monitoring.

Flourishing energy harvesters for future body sensor network: from single to multiple energy sources

“…The rapid advancement in materials, sensors, circuits, and wireless transmission technologies will give way to the body sensor network (bodyNET) (Niu et al, 2019;Tian et al, 2019), which enables human physiological signal detection not only on the skin but also inside the body as shown in Figure 1A (Lee et al, 2019a;Zheng et al, 2020). Flexible electronic technologies allow the sensors to exist in various forms, including electronic skins that are directly attached to the skin (Chen et al, 2019a;Oh and Bao, 2019;Pu et al, 2017b), clothes that are worn on the human body (Chen et al, 2020b;Shi et al, 2020c), glasses (Vera Anaya et al, 2020), face masks (Zhang et al, 2020a), watches (Quan et al, 2015), gloves (Sundaram et al, 2019), insoles (Wu et al, 2020b), socks (Zhang et al, 2020c), shoes (Li et al, 2017), and implantable devices (Arab Hassani et al, 2020;Hinchet et al, 2019;Xiang et al, 2016), to provide comprehensive monitoring of the user's health status and motions. For instance, the sensors attached to the skin or worn on the body can record body temperature, pulse, respiration rate, blood pressure, etc.…”

Low‐Cost, Highly Sensitive, and Flexible Piezoresistive Pressure Sensor Characterized by Low‐Temperature Interfacial Polymerization of Polypyrrole on Latex Sponge

“…Pressure sensors with flexible, highly sensitive, and wide strain range show great promise in the fields of human motion monitoring, [ 1 ] robotics, [ 2 ] speech recognition, [ 3 ] electronic skin, [ 4 ] wearable healthcare devices, [ 5 ] etc. According to the work principles, pressure sensors have been classified as piezoresistivity, capacitance, piezoelectricity, and triboelectricity.…”

Optimization of IoT-Based Artificial Intelligence Assisted Telemedicine Health Analysis System

“…After the rapid development and evolution of IoT technology in the last decade, it has gradually transitioned from the early theoretical research and the exploration stage to the practical deployment and application stage, which have produced many representative IoT applications in some application fields [1]. At present, IoT is in the stage of expansion and penetration of early coordination network and Radio Frequency Identification (RFID) applications to various levels of the national economic and social life, and the new application scenarios and demands put forward higher requirements for traditional Internet of Things (IoT) [2].…”