In this study, we report the photoresponse of vertically aligned few-layered graphene (VAG) upon infra-red (IR) irradiation at room temperature. Four probe measurements showed the current-voltage (I-V) characteristic of electrical switching during pulsed IR irradiation. The photoresponse reported here for VAG was significantly higher than that reported for carbon nanotube (CNT) samples. Our investigation shows that such a photoresponse arose solely from the bolometric effect, where the conductivity changed with temperature. The resistance magnitude of the VAGs increased~two fold for each 6 • C increase in temperature. Also, the Thermal Coefficient of Resistance (TCR) in this region was~11%/K, which is the highest TCR value reported for any carbon nanomaterial. formal analysis, data curation, S.M.K., A.K. and R.R.; writing-original draft preparation, K.S.H.; writing-review and editing, N.S. and J.M.; coordinating, D.S.M.Funding: This research received external funding from DST-SERB India, Project EEQ/2017/000497, for supporting the project.
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