Fully printed high performance humidity sensors based on two-dimensional materials

P He; J R Brent; H Ding; J Yang; D J Lewis; P O'Brien; B Derby

doi:10.1039/C7NR08115D

Fully printed high performance humidity sensors based on two-dimensional materials

Nanoscale. 2018 Mar 22;10(12):5599-5606. doi: 10.1039/C7NR08115D.

Authors

P He¹, J R Brent¹, H Ding¹, J Yang¹, D J Lewis¹, P O'Brien², B Derby¹

Affiliations

¹ School of Materials, University of Manchester, Oxford Road, M13 9PL, UK. Brian.Derby@manchester.ac.uk.
² School of Chemistry, University of Manchester, Oxford Road, M13 9PL, UK.

PMID: 29565064
DOI: 10.1039/C7NR08115D

Abstract

Fully printed humidity sensors based on two-dimensional (2D) materials are described. Monolayer graphene oxide (GO) and few-layered black phosphorus (BP) flakes were dispersed in low boiling point solvents suitable for inkjet printing. The humidity sensors were fabricated by printing GO and BP sensing layers on printed silver nanoparticle electrodes. The electrical response of the GO and BP sensors to humidity levels ranges from 11 to 97% relative humidity, which revealed a high capacitance sensitivity of 4.45 × 104 times for the GO sensor and 5.08 × 103 times for the BP sensor at 10 Hz operation frequency. Response/recovery times of the GO and BP sensor were found to be 2.7/4.6 s and 4.7/3.0 s respectively. These sensors also showed sensitive and fast response to a proximal human fingertip, showing potential applications in contactless switching.