زجاج يتذكر اللمسات سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2602.08056

Contact electrification (CE) remains a critical challenge in advanced material technologies where uncontrolled surface charging can compromise manufacturability, reliability, and performance in practical applications. Ultrathin glass with micrometer-scale thickness is a state-of-the-art specialty oxide material for flexible touchscreens in next-generation electronic devices. Here, we visualize and quantify CE-induced surface charges on ultrathin glass using sideband-mode Kelvin probe force microscopy (KPFM). Nanoscale atomic force microscopy (AFM) probes are used to scan and induce triboelectric charges on stand-alone glass surfaces under ultra-pure N$$_2$$ conditions. Time-dependent measurements reveal that surface charges on a 30~$$\mu$$m-thick glass sample decay from 4.47~V to 0.37~V over 240~minutes. Furthermore, electrostatic charges are found to exhibit capacitor-like discharging behavior primarily through the bulk material, yielding a long relaxation time constant of approximately 41~minutes. This behavior differs from the lateral surface discharging observed in thermally grown SiO$$2$$ thin films reported previously. A self-capacitance analytical model is developed to estimate the corresponding surface charge density ($$\sigma$$), yielding comparable values of 136.26~$$\pm$$~16.25~$$\mu$$C/m$$^2$$ at 30~$$\mu$$m and 131.44~$$\pm$$~28.41~$$\mu$$C/m$$^2$$ at 100~$$\mu$$m. Additionally, external bias applied to AFM tips can be used to enhance, suppress, or invert the intrinsic CE response of glass materials.