title: Touchless Optical Finger Motion Tracking Based on 2D Nanosheets with Giant Moisture Responsiveness.
abstract: A new optical touchless positioning interface based on ultrasensitive humidity responsive 1D photonic crystals utilizing the giant moisture dependent swelling capacity of 2D phosphatoantimonate nanosheets is presented. The spatially confined, full spectral color change combined with reversible transparency switching induced by the humidity sheath of a human finger allows for real time, true color lateral finger motion tracking under touchless conditions.
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.|Department of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.|Nanosystems Initiative Munich (NIM) and Center for Nanoscience, Schellingstraße 4, 80799, Munich, Germany.
authors.forename: Katalin
authors.initials: K
authors.lastname: Szendrei
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.|Department of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.
authors.forename: Pirmin
authors.initials: P
authors.lastname: Ganter
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
authors.forename: Olalla
authors.initials: O
authors.lastname: Sànchez-Sobrado
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
authors.forename: Roland
authors.initials: R
authors.lastname: Eger
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Kuhn
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.|Department of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.|Nanosystems Initiative Munich (NIM) and Center for Nanoscience, Schellingstraße 4, 80799, Munich, Germany.
authors.forename: Bettina V
authors.initials: BV
authors.lastname: Lotsch
keywords: 2D nanosheets; humidity sensors; photonic crystals; resistive sensing; touchless positioning interfaces