Ecologically friendly wood electronics will help alleviating the shortcomings of state-of-art cellulose-based “green electronics”. Here we introduce iron-catalyzed laser-induced graphitization (IC-LIG) as an innovative approach for engraving large-scale electrically conductive structures on wood with very high quality and efficiency, overcoming the limitations of conventional LIG including high ablation, thermal damages, need for multiple lasing steps, use of fire retardants and inert atmospheres. An aqueous bio-based coating, inspired by historical iron-gall ink, protects wood from laser ablation and thermal damage while promoting efficient graphitization and smoothening substrate irregularities. Large-scale (100 cm²), highly conductive (≥2500 S m⁻¹) and homogeneous surface areas are engraved single-step in ambient atmosphere with a conventional CO₂ laser, even on very thin (∼450 µm) wood veneers. We demonstrate the validity of our approach by turning wood into highly durable strain sensors, flexible electrodes, capacitive touch panels and an electroluminescent LIG-based device.

生态友好的木质电子产品将有助于缓解最先进的纤维素基“绿色电子产品”的缺点。在这里，我们介绍铁催化激光诱导石墨化 (IC-LIG) 作为一种创新方法，用于在木材上以非常高的质量和效率雕刻大型导电结构，克服了传统 LIG 的局限性，包括高烧蚀、热损伤、需要对于多个激光步骤，使用阻燃剂和惰性气氛。受历史悠久的铁胆墨水启发的水性生物基涂料可保护木材免受激光烧蚀和热损伤，同时促进高效石墨化和平滑基材不规则性。大尺度（100 cm ²）、高导电（≥2500 S m ⁻¹_{) 和均匀的表面区域是在环境大气中使用传统的 CO 2}激光一步雕刻的，即使是在非常薄的 ( ∼ 450 µm) 木板上。我们通过将木材变成高度耐用的应变传感器、柔性电极、电容式触摸面板和基于 LIG 的电致发光设备来证明我们方法的有效性。