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membrane was fixed on the outer rim by an annular acrylic sheet. Membrane deformation caused by acoustic waves triggered the contact and separation between FEP and the membrane electrode, and thus generated electrical outputs. The fabricated TAS device achieved an ultrahigh sensitivity of 112.4 mV/dB, with applications such as a sound- controllable switch and an antitheft system demonstrated. More importantly, the frequency response of the TAS could be tuned and optimized by the introduction of annular or sectional inner boundary architectures, which enables it to have applications in an electronic auditory system with high quality and fidelity in sound recording as well as security systems using voice recognition. The TAS with tunable frequency response also has huge potential in hearing aids since the signals of the impaired frequency region can be naturally enhanced through device design. Such a TAS-based system greatly reduces the complexity and cost of signal processing circuits in conventional hearing aids. 4.2 Keystroke Dynamics Enabled Authentication and Identification using TENG Array Keystroke dynamics, first proposed by Spillane in 1975,170 is a behavioral biometric based on people’s typing attributes. Its ballistic nature171 and non-invasive monitoring characteristics172, 173 have fostered its applications in multi-factor authentication174 for enhanced cyber security, especially after the establishment of its singularity to the typist by both the National Science Foundation and National Institute of Standards and Technology in the 1980s175. However, most academic and industrial efforts171 utilize only the features of keystroke latency and key hold time, without taking into account the typing force, typing speed and/or finger size of individuals.176-179 Here we developed a two-factor authentication and identification system composed of a triboelectric keystroke device that 109PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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