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This paper presents an organic field effect transistor for the detection of dinitrotoluene (DNT). DNT is a common explosive simulant or a by-product of trinitrotoluene (TNT). The sensors in this work were exposed to dinitrotoluene (DNT). The electron withdrawing nitro group allows OFETs to be used as sensors. Both n-channel (electron carrying) and p-channel (hole carrying) transistors were tested and gave varying responses to DNT vapors.