Pencil drawn interdigitated capacitive sensors on wood substrate

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Abstract

This research presents the fabrication and characterization of an interdigitated capacitive (IDC) sensor on a wooden substrate using pencil traces. The resistance of the pencil traces decreased from 100 kΩ to 5 kΩ as the pencil grade shifted from HB to 8B. Concurrently, capacitance measurements revealed an increase from approximately 5 pF for a 5-finger IDC made with HB pencil to around 32 pF for an 8B pencil counterpart. Increasing the number of pencil traces from 10 to 50 resulted in a significant decrease in resistance and a proportional increase in capacitance. Application of the IDC sensor demonstrated notable changes in capacitance upon proximity and touch, with a significant decrease upon removal. The interdigitated capacitance sensor exhibits good proximity effects and contact sensitivity in touch, with capacitance increasing exponentially from 0.3 pF (7 cm) to 1.2 pF (direct contact), highlighting its ability to detect objects with high precision. Additionally, environmental factors such as temperature and humidity influence capacitance values. These findings underscore the potential of pencil-drawn IDC sensors for responsive and adaptable applications in various fields.

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铅笔绘制的木质基底互嵌电容式传感器
本研究介绍了在木质基板上使用铅笔迹线制作互插电容式(IDC)传感器并对其进行表征。随着铅笔等级从 HB 到 8B,铅笔痕迹的电阻从 100 kΩ 下降到 5 kΩ。同时,电容测量显示,使用 HB 铅笔制作的 5 指 IDC 的电容从约 5 pF 增加到 8B 铅笔的约 32 pF。铅笔线迹数量从 10 条增加到 50 条后,电阻显著下降,电容也成比例增加。IDC 传感器的应用表明,在接近和触摸时电容会发生显著变化,而移除后电容则会明显减小。互斥电容传感器在触摸时表现出良好的接近效应和接触灵敏度,电容值从 0.3 pF(7 厘米)呈指数增长到 1.2 pF(直接接触),突出了其高精度检测物体的能力。此外,温度和湿度等环境因素也会影响电容值。这些发现凸显了铅笔绘制的 IDC 传感器在各个领域的反应灵敏、适应性强的应用潜力。
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