Triboelectric‐Based Transparent Secret Code

Abstract

Private and security information for personal identification requires an encrypted tool to extend communication channels between human and machine through a convenient and secure method. Here, a triboelectric‐based transparent secret code (TSC) that enables self‐powered sensing and information identification simultaneously in a rapid process method is reported. The transparent and hydrophobic TSC can be conformed to any cambered surface due to its high flexibility, which extends the application scenarios greatly. Independent of the power source, the TSC can induce obvious electric signals only by surface contact. This TSC is velocity‐dependent and capable of achieving a peak voltage of ≈4 V at a resistance load of 10 MΩ and a sliding speed of 0.1 m s−1, according to a 2 mm × 20 mm rectangular stripe. The fabricated TSC can maintain its performance after reciprocating rolling for about 5000 times. The applications of TSC as a self‐powered code device are demonstrated, and the ordered signals can be recognized through the height of the electric peaks, which can be further transferred into specific information by the processing program. The designed TSC has great potential in personal identification, commodity circulation, valuables management, and security defense applications.

Self‐Sustainable Wearable Textile Nano‐Energy Nano‐System (NENS) for Next‐Generation Healthcare Applications

“…The further development of wearable electronics is in high demand for widely distributed and mobile power sources, where most cases are still conventional batteries that cannot bypass the repetitive recharging processes . To this end, substantial efforts have been made for the development of environmentally friendly and sustainable energy harvesters that are capable of converting extensively existed mechanical energy into electrical energy based on the mechanism of piezoelectric, electromagnetic, and triboelectric . And the harvested energy could be used for powering diversified wearable sensors, or for direct muscle and nerve stimulation for rehabilitation, which enables a self‐sustainable wearable system for the next‐generation healthcare applications.…”

Self‐Powered Bio‐Inspired Spider‐Net‐Coding Interface Using Single‐Electrode Triboelectric Nanogenerator

“…To overcome this issue, information coding can be potentially introduced into the sensing electrodes, [53,76,77] then forming 2D layout for multidirectional detection and control. A possible design is using connected strip electrodes with varying number of electrodes in different directions for multiple motion control.…”

A Green Triboelectric Nano-Generator Composite of Degradable Cellulose, Piezoelectric Polymers of PVDF/PA6, and Nanoparticles of BaTiO3

“…In previous studies, it has been proved that nano-generators can effectively convert mechanical energy into electrical energy [1][2][3][4], and the conversion efficiency depends on the degree of coupling between friction effect and electrostatic induction. Moreover, nano-generators have the characteristics of high output voltage, small size, light weight, low cost and good safety [5][6][7][8][9]. They are widely used in the fields of mobile electronic devices, sensing systems and biomedicine [10][11][12][13].…”