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Title: Enhancement of humidity sensitivity of graphene through functionalization with polyethylenimine

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3] ;  [1] ;  [2]
  1. CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, Singapore 637553 (Singapore)
  2. (Singapore)
  3. (France)
  4. School of Electrical and Electronics Engineering, Nanyang Technological University, Block S1, 50 Nanyang Avenue, Singapore 639798 (Singapore)
Publication Date:
OSTI Identifier:
22482188
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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