Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine

Journal Article · Mon Sep 28 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4932124· OSTI ID:22482188

Ben Aziza, Zeineb ^[1]; Zhang, Kang ^[2]; Baillargeat, Dominique ^[1]; Zhang, Qing ^[1]

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1. CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, Singapore 637553 (Singapore)
2. School of Electrical and Electronics Engineering, Nanyang Technological University, Block S1, 50 Nanyang Avenue, Singapore 639798 (Singapore)

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.

• OSTI ID: 22482188
• Journal Information: Applied Physics Letters, Vol. 107, Issue 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMINES
CHEMICAL VAPOR DEPOSITION
ELECTRON TRANSFER
ENERGY RECOVERY
FIELD EFFECT TRANSISTORS
GEOMETRY
GRAPHENE
HUMIDITY
MATERIALS RECOVERY
POLYMERS
SENSITIVITY
SENSORS