Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine

Zeineb Ben Aziza (1, 2, 3) , Kang Zhang (1) , Dominique Baillargeat (2, 3) , Qing Zhang (3, 1)

1 EEE - School of Electrical and Electronic Engineering
2 XLIM-SRF - Systèmes RF
3 CINTRA - CNRS International - NTU - Thales Research Alliance

In this work, we show that the sensing performance of graphene based humidity sensors can be largely improved through polymer functionalization. Chemical vapor deposited graphene is functionalized with amine rich polymer, leading to electron transfer from amine groups in the polymer to graphene. The functionalized graphene humidity sensor has demonstrated good sensitivity, recovery, and repeatability. Charge transfer between the functionalized graphene and water molecules and the sensing mechanism are studied systemically using field effect transistor geometry and scanning Kelvin probe microscopy.

Mots clés: Graphene; Doping; Polymer; Gold; Superconductor

Domaines: Sciences de l'ingénieur [physics]; Electronique

Zeineb Ben Aziza, Kang Zhang, Dominique Baillargeat, Qing Zhang. Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine. Applied Physics Letters, 2015, 107 (13), pp.134102. ⟨10.1063/1.4932124⟩. ⟨hal-01501915⟩