A Self-Powered Tactile Sensor Resistant to Environmental Interference.
basic_science · Level V
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- Record sourced from PubMed, PMID 41178140.
- Also identified by DOI 10.1002/adma.202516596.
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Abstract
Developing advanced tactile sensors is important for cutting-edge applications such as human-machine interaction. However, the current tactile sensing technology primarily exploits triboelectrification, which is inherently susceptible to ambient interference, obstructing their real-world applications. Herein, a robust tactile sensing platform is presented that leverages piezoelectrics for mechano-optoelectronic transduction. A new class of ScBO<sub>3</sub>:Cr<sup>3+</sup> crystals is developed that can produce intense broadband near-infrared light under sole mechanical pressure through self-recoverable mechanoluminescence (ML). Through a combinatorial doping strategy, deliberate modulation of ML profile is achieved across a broad wavelength range with a precision down to ≈1 nm and a full width at half maximum up to ≈273 nm. This effect allows maximal optoelectronic conversion using a basic silicon photodiode free of ambient interference. These findings enable a fast-response (≈20 ms) and low-threshold (≈kPa level) tactile stylus that can accurately authenticate signatures with the aid of machine learning algorithms in complex environments presenting moisture and light interference.