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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 |
Keywords: | graphene ink;positive temperature coefficient of resistivity;photo-thermoelectric effect;Kohlrauch function |
Issue Date: | 16-Dec-2016 |
Publisher: | IOP Publishing |
Citation: | Banerjee, I., Faris, T., Stoeva, Z., Harris, P.G., Chen, J., Sharma, A.K. and Ray, A.K. (2016) 'Graphene films printable on flexible substrates for sensor applications', 2D Materials, 4(1), 015036, pp. 1 - 12. doi: 10.1088/2053-1583/aa50f0. |
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. |
URI: | https://bura.brunel.ac.uk/handle/2438/13555 |
DOI: | https://doi.org/10.1088/2053-1583/aa50f0 |
Other Identifiers: | 015036 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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