Wearable triboelectric devices have been widely used for sensing and energy harvesting applications, and further improving the compactness will enhance the convenience and comfortability. In this work, an easy-fabricated and compact untethered triboelectric patch is proposed with Polytetrafluoroethylene (PTFE) as triboelectric layer and human body as conductor. We find that the conductive characteristic of human body has negligible influence on the outputs, and the untethered triboelectric patch has good output ability and robustness. The proposed untethered triboelectric patches can work as sensor patches and energy harvester patches. Three typical applications are demonstrated, which are machine learning assisted objects distinguishing with accuracy up to 93.09–94.91 %, wireless communication for sending typical words to a cellphone, and human motions energy harvesting for directly powering electronics or charging an energy storage device.

可穿戴摩擦电器件已广泛用于传感和能量收集应用，进一步提高紧凑性将提高便利性和舒适性。在这项工作中，以聚四氟乙烯（PTFE）作为摩擦电层，人体作为导体，提出了一种易于制造且紧凑的无束缚摩擦电贴片。我们发现人体的导电特性对输出的影响可以忽略不计，无束缚摩擦电贴片具有良好的输出能力和鲁棒性。所提出的无束缚摩擦电贴片可以用作传感器贴片和能量收集器贴片。展示了三个典型应用，它们是机器学习辅助对象识别，准确率高达 93.09–94.91%，用于向手机发送典型单词的无线通信，