January 24, 2024 | Chenglong Li, Hongyu Luo, Xinyi Lin, Shun Zhang, Jizhou Song
This paper reports a novel laser-driven noncontact bubble transfer printing technique using a hydrogel composite stamp. The stamp features a circular reservoir filled with hydrogel, encapsulated by a laser absorption layer and an adhesion layer. The hydrogel's liquid-gas phase transition under laser heating causes a bulge on the stamp surface, eliminating interfacial adhesion and facilitating the transfer of microscale Si platelets onto various challenging surfaces, including glass, keys, wrenches, steel spheres, dry petals, and droplets. This method offers strong adhesion under a small preload and reliable damage-free pick-up, making it suitable for deterministic assembly of unconventional electronic systems such as flexible inorganic electronics, curved electronics, and micro-LED displays. The hydrogel composite stamp's unique design and adhesion modulation mechanism are detailed, along with experimental and numerical studies demonstrating its effectiveness and versatility.This paper reports a novel laser-driven noncontact bubble transfer printing technique using a hydrogel composite stamp. The stamp features a circular reservoir filled with hydrogel, encapsulated by a laser absorption layer and an adhesion layer. The hydrogel's liquid-gas phase transition under laser heating causes a bulge on the stamp surface, eliminating interfacial adhesion and facilitating the transfer of microscale Si platelets onto various challenging surfaces, including glass, keys, wrenches, steel spheres, dry petals, and droplets. This method offers strong adhesion under a small preload and reliable damage-free pick-up, making it suitable for deterministic assembly of unconventional electronic systems such as flexible inorganic electronics, curved electronics, and micro-LED displays. The hydrogel composite stamp's unique design and adhesion modulation mechanism are detailed, along with experimental and numerical studies demonstrating its effectiveness and versatility.