Flexible electronics with great functional characteristics have proved to be a stepping stone in the field of wearable devices. Amongst all, gesture-sensing techniques have been widely studied for human-machine interfaces. In this paper, we propose a self-powered gesturesensing system attached to the back of the hands, which has the capability of distinguishing hand gestures by measuring the triboelectric nanogenerator output signal. By attaching the sensor on the back of the hand, we can sense the displacement of tendons to detect the gestures. In addition, humidity resistance and durability of the device were tested and validated. Furthermore, we have established a set of rules to define the relationship between gestures and corresponding English letters. Therefore, the proposed sensor can further serve as an electronic sign language translator by converting gestures into words. Finally, we can integrate this system into gloves to enhance the applicability and utility. Overall, we have developed a real-time self-powered back-of-hand sensing system which can recognize various hand gestures.
Bacteria is present everywhere in our daily lives, and bacterial assays have become a topic of constant concern in the world. Common urinary tract pathogenic Escherichia coli (UPEC) which has type 1 pili, easily attaches to the epithelial cells of the human body, causing urinary tract infections, cystitis, or inflammatory bowel disease. Type 1 pili are found in more than 95% of E. coli isolates of intestinal and extraintestinal infections (eg, urine infections). There are many studies on type 1 pili, which are mainly composed of proteins, and the most significant is the terminal fim H protein, which can specifically bind to D-mannose. This research is dedicated to the development of a rapid-responding E. coli sensor that uses mannose to capture bacteria. Based on the principle of contact-electrification, as the E. coli attached to the surface of the sample is in contact with a liquid, the concentration of the bacteria can be detected in a short time by measuring the voltage output. For the first time, a simple, rapid and low-cost E. coli sensor was developed as a triboelectric system.
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