Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.050
Publication date: 6th July 2018
Electron transport (ETp), i.e., electronic conduction, across protein monolayers in a solid state–like configuration is surprisingly efficient, comparable, length-normalized, to completely conjugated molecules. This is amazing as apparently nature does not use this capability, except for electron transfer, ET, within and some times between redox proteins, a process that is coupled to ionic transport.
Nature regulates ET via redox chemistry, while for ETp a redox process is not a necessary condition. This allows studying ETp via non-redox proteins, such as rhodopsins and albumins; remarkably, ETp is quite efficient also across these proteins.
If contact to the external world does not limit ETp, i.e., intra-protein transport dominates, there seems to be no barrier for transport. As ETp is temperature-independent, it may well be coherent…. This may be important also for electron transfer, ET, which involves injection and extraction of electrons, the analogue of which for ETp is the coupling to the electrodes. Then, efficient ETp via non-redox proteins suggests why there are redox centres in ET proteins, ito protect it from high reducing power.
I will discuss experimental data that illustrate our main results as well as some more recent ones on multi-heme proteins and on protein multilayers, which raise even more questions.1,2
* work with Mordechai Sheves & Israel Pecht, Weizmann Inst.
References
C. Bostick et al. Rep. Prog.Phys., 81 (2018) 026601, “Protein bioelectronics:a review of what we do and do not know” doi.org/10.1088/1361-6633/aa85f2 ,
N. Amdursky et al., Adv. Mater. 42, (2014) 7142 “Electronic Transport via Proteins” 10.1002/adma.201402304
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