2, Korea University, Seoul, , Korea (the Republic of)
Bio-integrated electronics is of great interest in emerging fields of bio-injectable and bio-medical applications. One of recent technologies, transient electronics, has peculiar characteristics that suggest the different behavior: it completely dissolves/disappear over time in a prescribed and/or triggered manner. Electronic system that is ‘transient’ in this sense has unique advantages that cannot be addressed with conventional electronics, such as biomedical implants that can be operational for clinically useful time span, then physically degrades/resorbs into the body. One of key properties, the control of entire lifetime of the system still has limitation. Previous researches have been trying to overcome this drawback with regulating pH level, passivating electronic components with other materials, and varying thickness of transient materials. In spite of these efforts to control the lifetime of devices, those strategies are limited to solution-based control. Here, we suggest a new approach that transient devices are successfully compromised by external heat source using near infrared (NIR) light, and all experiments are confirmed by in vivo and in vitro tests, and simple analytical (theoretical and FEM) simulations.