the electronic properties derived from proteins through high electron transfer efficiency

and distinctive energy bandgap characteristics, particularly in the development of protein-

based biomemory. Güzel’s group developed the photo-induced biomemory device. [32].

Ferritin-based Fe and Mn containing bionanocages (FeMnFBNC) immobilized on the

graphene surface by electrostatic bonding were fabricated using photosensitive cross-

linkers. The ferritin in the FeMnFBNC acted as an electron bridge, enabling electron transfer

between graphene and the FeMnFBNC. Besides, Fe and Mn were able to capture the

moving electrons for a long time through redox reaction properties. Using a developed

biomemory device, multi-state biomemory behavior was demonstrated through regulation

of the oxidation potential (write state), open-circuit potential (read state), and reduction

potential (erase state) by UV light irradiation.

Zhang’s group developed a biomemristor (a word blending of memory and resistor)

device composed of Ag-doped silk fibroin [33] (Figure 17.5a). Conventional silk fibroin-

based biomemristors need a high operating current because silk fibroin forms a random

FIGURE 17.5

(a) The Ag-doped silk fibroin-based biomemristor. Adapted with permission [ 33]. Copyright (2021) American

Chemical Society. (b) The AuNP-based biologic gate. Adapted with permission [ 35]. Copyright (2019) American

Chemical Society. (c) A SWCNT-based FET. Adapted with permission [ 36]. Copyright (2020) American Chemical

Society.

Nanomaterial-Assisted Devices

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