Label-sensor is an essential component of the label printer which is becoming a most significant tool for the development of Internet of Things (IoT). However, some drawbacks of the traditional infrared label-sensor make the printer fail to realize the high-speed recognition of labels as well as stable printing. Herein, we propose a self-powered and highly sensitive tribo-label-sensor (TLS) for accurate label identification, positioning and counting by embedding triboelectric nanogenerator into the indispensable roller structure of a label printer. The sensing mechanism, device parameters and deep comparison with infrared sensor are systematically studied both in theory and experiment. As the results, TLS delivers 6 times higher signal magnitude than traditional one. Moreover, TLS is immune to label jitter and temperature variation during fast printing and can also be used for transparent label directly and shows long-term robustness. This work may provide an alternative toolkit with outstanding advantages to improve current label printer and further promote the development of IoT.

标签传感器是标签打印机的重要组成部分，标签打印机正在成为物联网（IoT）发展的最重要工具。然而，传统红外标签传感器的一些缺陷使得打印机无法实现标签的高速识别和稳定打印。在此，我们提出了一种自供电且高灵敏度的摩擦标签传感器（TLS），通过将摩擦纳米发电机嵌入标签打印机不可或缺的滚筒结构中，实现精确的标签识别、定位和计数。从理论和实验上对传感机理、器件参数以及与红外传感器的深度比较进行了系统研究。结果，TLS 提供的信号强度比传统信号高 6 倍。此外，TLS在快速打印过程中不受标签抖动和温度变化的影响，也可以直接用于透明标签，并显示出长期的稳健性。这项工作可能为改进现有标签打印机并进一步促进物联网的发展提供具有突出优势的替代工具包。