Hydroprinted Electronics: Ultrathin Stretchable Ag–In–Ga E-Skin for Bioelectronics and Human–Machine Interaction
- Pedro Alhais LopesPedro Alhais LopesInstitute of Systems and Robotics, University of Coimbra, Coimbra 3030-290, PortugalMore by Pedro Alhais Lopes,
- Hugo PaisanaHugo PaisanaInstitute of Systems and Robotics, University of Coimbra, Coimbra 3030-290, PortugalMore by Hugo Paisana,
- Anibal T. De AlmeidaAnibal T. De AlmeidaInstitute of Systems and Robotics, University of Coimbra, Coimbra 3030-290, PortugalMore by Anibal T. De Almeida,
- Carmel Majidi*Carmel Majidi*E-mail: [email protected] (C.M.).Integrated Soft Materials Lab, Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United StatesMore by Carmel Majidi, and
- Mahmoud Tavakoli*Mahmoud Tavakoli*E-mail: [email protected] (M.T.).Institute of Systems and Robotics, University of Coimbra, Coimbra 3030-290, PortugalMore by Mahmoud Tavakoli
Abstract

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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