Touchless Optical Finger Motion Tracking Based on 2D Nanosheets with Giant Moisture Responsiveness

Katalin Szendrei; Pirmin Ganter; Olalla Sànchez-Sobrado; Roland Eger; Alexander Kuhn; Bettina V Lotsch

doi:10.1002/adma.201503463

Touchless Optical Finger Motion Tracking Based on 2D Nanosheets with Giant Moisture Responsiveness

Adv Mater. 2015 Nov 4;27(41):6341-8. doi: 10.1002/adma.201503463. Epub 2015 Sep 22.

Authors

Katalin Szendrei^{1

2

3}, Pirmin Ganter^{1

2}, Olalla Sànchez-Sobrado¹, Roland Eger¹, Alexander Kuhn¹, Bettina V Lotsch^{1

2

3}

Affiliations

¹ Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569, Stuttgart, Germany.
² Department of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.
³ Nanosystems Initiative Munich (NIM) and Center for Nanoscience, Schellingstraße 4, 80799, Munich, Germany.

PMID: 26394013
DOI: 10.1002/adma.201503463

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.

Keywords: 2D nanosheets; humidity sensors; photonic crystals; resistive sensing; touchless positioning interfaces.