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Interaction of Radiation with Graphene Based Nanomaterials for Sensing Fissile Materials

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Technical Report,07 Jul 2009,06 Jul 2013

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Purdue University West Lafayette United States

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We fabricated graphene on various semiconductor substrates and graphene nanocomposites with semiconductor nanoparticle fillings. We studies the transient interactions of photons visible, X-rays and gamma rays with graphene field effect transistors GFET made from exfoliated, epitaxial, and CVD graphene on various absorber substrates such as Si, SiC, and GaAs, CdTe. The potential of GFETs to sense ionizing radiation with high sensitivity, low noise, and room temperature operationhas been experimentally demonstrated. We studied the photoresponse photoconductivity of photodectors based on graphene, graphene composite and graphene-semiconductor hybrid and achieved a high photoresponsivity at room temperature. We also investigated the long term effects of charged radiation particular e-beam on graphene material and its devices. Our work on the exploiting graphene-based nanostructured materials to detect ionizing radiations with high sensitivity may lead to new schemes of sensing fissle materials at long range, a major challenge in countering weapons of mass destruction WMD.

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