Damdam, A. N.; Qaisar, N.; Hussain, Muhammad Mustafa(Applied Physics Letters, AIP Publishing, 2019-09-09)[Article]
The shape reconfiguration is an arising concept in advanced electronics research, which allows the electronic platform to change in shape and assume different configurations while maintaining high electrical functionality. The reconfigurable electronic platforms are attractive for state of the art biomedical technologies, where the reshaping feature increases the adaptability and compliance of the electronic platform to the human body. Here, we present an amorphous silicon honeycomb-shaped reconfigurable electronic platform that can reconfigure into three different shapes: the quatrefoil shape, the star shape, and an irregular shape. We show the reconfiguration capabilities of the design in microscale and macroscale fabricated versions. We use finite element method analysis to calculate the stress and strain profiles of the microsized honeycomb-serpentine design at a prescribed displacement of 100 μ m. The results show that the reconfiguration capabilities can be improved by eliminating certain interconnects. We further improve the design by optimizing the serpentine interconnect parameters and refabricate the platform on a macroscale to facilitate the reconfiguration process. The macroscale version demonstrates an enhanced reconfiguration capability and elevates the stretchability by 21% along the vertical axis and by 36.6% along the diagonal axis of the platform. The resulting reconfiguring capabilities of the serpentine-honeycomb reconfigurable platform broaden the innovation opportunity for wearable electronics, implantable electronics, and soft robotics.
Qaiser, Nadeem; Damdam, A. N.; Khan, Sherjeel M.; Shaikh, Sohail F.; Hussain, Muhammad Mustafa(Applied Physics Letters, AIP Publishing, 2019-10-28)[Article]
Currently, stretchable electronics has gained intensive attention due to its numerous applications, especially for implantable medical diagnostics and soft actuator based surgeries. A practical stretchable system requires the use of a feedback-assisted structure, i.e., that can detect the movement of the device, analyze the data, and manage the motion, referred to as digitally controlled actuation. An island-interconnect configuration is used to attain the stretchable electronics such as a spiral interconnect is commonly used architecture due to its high stretchability and ability to accommodate large deformations. Here, we fabricate the microscale stretchable series networks and experimentally demonstrate their stretching profiles. A systematic comparison using experiments and finite element method modeling illustrates the mechanical response of the series network up to their fracture limit and shows the stretchability of 160% before the fracture. Cyclic testing shows that the spiral-interconnect experiences no fracture up to 412 cycles. We then devise a sensing mechanism, which detects the actual movement of the island during stretching. The sensitivity and resolution of the sensing mechanism are 1.4 fF/μm and 0.7 μm, respectively. Our proposed sensing mechanism might digitally control the soft robotic-arms and actuators for next-generation drug delivery and targeted application of artificial entities.
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