Shape-changing substrates are pivotal for advancing minimally invasive, conformable bioelectronics, yet their implantation is hindered by inaccessible triggering mechanisms and complex geometric fabrication. Here, the authors report a digital 4D printing technique for fabricating customized shape memory hydrogel substrates enabling trigger-free shapeshifting with predefined onset periods.
- Chujun Ni
- Chunlei Zhang
- Qian Zhao
