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Keywords:

  • paper;
  • capacitance;
  • touch pads;
  • sensors;
  • flexible electronics
Thumbnail image of graphical abstract

Metallized paper is patterned to create touch pads of arrayed buttons that are sensitive to contact with both bare and gloved fingers. The paper-based keypad detects the change in capacitance associated with the touch of a finger to one of its buttons. Mounted on an alarmed cardboard box, the keypad requires the appropriate sequence of touches to disarm the system.