材料科学
电子皮肤
生物电子学
纳米技术
柔性电子器件
光电子学
导电体
导电油墨
可伸缩电子设备
微电子
数码产品
生物传感器
电气工程
复合材料
薄板电阻
图层(电子)
工程类
作者
Pedro Alhais Lopes,Hugo Paisana,Anı́bal T. de Almeida,Carmel Majidi,Mahmoud Tavakoli
标识
DOI:10.1021/acsami.8b13257
摘要
We introduce a soft ultrathin and stretchable electronic skin with surface-mounted components that can be transferred and wrapped around any three-dimensional (3D) surface or self-adhere to the human skin. The ∼5 μm thick circuit is fabricated by printing the pattern over a temporary tattoo paper using a desktop laser printer, which is then coated with a silver ink and eutectic gallium-indium (EGaIn) liquid metal alloy. The resulting "Ag-In-Ga" traces are highly conductive and maintain low electrical resistivity as the circuit is stretched to conform to nondevelopable 3D surfaces. We also address integration of surface-mounted microelectronic chips by introducing a novel z-axis conductive interface composed of magnetically aligned EGaIn-coated Ag-Ni microparticles embedded in polyvinyl alcohol (PVA). This " zPVA conductive glue" allows for robust electrical contacts with microchips that have pins with dimensions as small as 300 μm. If printed on the temporary tattoo transfer paper, the populated circuit can be attached to a 3D surface using hydrographic transfer. Both printing and interfacing processes can be performed at the room temperature. We demonstrate examples of applications, including an electronic tattoo over the human epidermis for electromyography signal acquisition, an interactive circuit with touch buttons, and light-emitting diodes transferred over the 3D printed shell of a robotic prosthetic hand, and a proximity measurement skin transferred over a 3D surface.
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