Fibrous proteins from bacteria can be used to make biofilms with electrical conductivities that are comparable to those measured in conducting polymers.
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Qian, F., Li, Y. A natural source of nanowires. Nature Nanotech 6, 538–539 (2011). https://doi.org/10.1038/nnano.2011.148
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DOI: https://doi.org/10.1038/nnano.2011.148
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