Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.052
Publication date: 18th July 2019
Solid state Electron Transport (ETp), electronic conduction, across junctions with an ultra-thin protein film as active layer, can be surprisingly efficient. Length-normalized, their ETp efficiency can be similar or even exceed that of conjugated molecules; on top of that, it is temperature-independent down to 4 K. That is amazing as nature does not seems to need these features at RT, where electron transfer, ET, involving proteins in solution and/or membranes is a central, ion transport-coupled process. If contacts do not limit ETp which is a challenge in itself to measure and achieve, i.e., transport across the proteins dominates, then we cannot measure a transport barrier. For small proteins we have now good evidence for tunnelling as the mechanisms, also as result of fruitful collaborations with computational theory experts. However, behaviour of larger proteins remains a puzzle, which is still unsolved. I will show experimental data1,2, incl. recent ones (ours and others), which should at least help to define this puzzle. Note that understanding ETp may be important also for ET, in which coupling to the contacts is replaced by electron injection/extraction.
* work done with Mordechai Sheves & Israel Pecht, at the Weizmann Inst. of Science, Rehovot, Israel
(DC is also at Bar-Ilan Univ., Ramat Gan, Israel).
- C. Bostick et al. Rep. Prog. Phys., 81 (2018) 026601
- N. Amdursky et al., Adv. Mater. 42, (2014) 7142
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