Congratulations to Ph.D student Xuefeng Zhao for publishing his work on Nano Energy
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A Skin-Like Sensor for Intelligent Braille Recognition

Inspired by human skin, our team designed and manufactured a novel flexible piezoresistive tactile sensor with high sensitivity and linearity. It is composed of three main parts including the random Gaussian distribution (RGD) spinosum on polydimethylsiloxane as the top substrate, the multilayer Ti2C-MXene film as the intermediate conductive filler, and the commercial polyimide-based interdigital electrodes as the bottom substrate. The working mechanism of RGD spinosum and Ti2C-MXene films in the flexible tactile sensor are clarified by COMSOL Multiphysics simulations and density functional theory calculations, respectively. The sensitivity of the sensor can reach 507 kPa− 1. In addition, it is the first time to realize real-time Braille effective intelligent recognition by such a flexible skin-like tactile sensor with the random decision forests algorithm.
 (a) Schematic diagram of human skin, which is mainly composed of three parts: epidermis, dermis and subcutaneous tissue. The RGD spinosum of the outer epidermis is one of the most the crucial factors for obtaining high sensitivity. (b) Schematic diagram of the skin-like tactile sensor, consisting of the top PDMS surface layer with RGD spinosums, the intermediate Ti2C-MXene assembly films as flexible conductive sensing layer, and the bottom PI-based interdigital electrode. (c) Recognition Braille in real-time by the sensor array based on the RDFA.