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Title: Graphene films printable on flexible substrates for sensor applications
Authors: Banerjee, I
Faris, T
Stoeva, Z
Harris, PG
Chen, J
Sharma, AK
Ray, AK
Issue Date: 2016
Publisher: IOP Publishing
Citation: 2D Materials, pp. 1-29, (2016)
Abstract: Fifteen-layered graphene films have been successfully deposited onto flexible substrates using a commercial ink consisting of graphene particles dispersed in an acrylic polymer binder. A value of 74.9 × 105cm−2 was obtained for the density of defects, primarily located at the flake edges, from the ratio of the D and G Raman peaks located at 1345cm1 and 1575cm1 respectively. 0.5μm thick drop-cast films on interdigitated silver electrodes exhibited Ohmic conduction with a small activation energy of 12meV over the temperature range from 260K to 330K . The photo-thermoelectric effect is believed to be responsible for photoconduction through graphene films under illumination intensity of 10mWm-2 at 270 nm, corresponding to the UV absorption peak. The photo-transient decay at the bias of 1V involves two relaxation processes when the illumination is switched off and values of 8.9 × 103𝑠 and 4.3 × 104𝑠 are found for the relaxation time constant using the Kohlrauch stretched exponential function analysis.
ISSN: 2053-1583
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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