Acta Physica Sinica, Volume. 69, Issue 17, 178702-1(2020)
Fig. 2. (a) Schema of sericin memristor; (b) the retention characteristics of the device; (c) typical
Fig. 3. Schema of egg albumen memristor: (a) Proposed fabrication process and schematic of a W/egg albumen/ITO/PET memristor; (b) extracted device HRS and LRS versus bending length; (c) superposition of
Fig. 4. Ferritin based memristor: (a) Illustration of the fabrication of a single nanorod device with ferritin nanocage spanning OWL-generated about 12 nm gap; (b) ON/OFF ratio of ferritin-based memristive nanodevices with different Fe loading (the color intensity of the protein nanocage core indicates the density of Fe atom); (c) schematic diagram of ferritin, the spherical shell consists of peptide subunits (green) and the mineral core consisting of hydrous iron oxide (orange), lower right panel is the schematic illustration of the Pt/ferritin/Pt memristor on the SiO2/Si substrate; (d) switching voltage distributions of the non-volatile memory; (e)
Fig. 5. (a) Schema of S-layer protein memristor; (b) endurance characteristics; (c) schematic diagrams of the fabricated rDnaJ device arrays; (d)
Fig. 6. (a) Schematic diagrams of keratin from human hair, and the fabrication process of Ag/keratin/FTO memory devices; (b) set and reset voltage distributions collected from eight different devices; (c) the retention characteristics of the device; (d) distribution of the HRS and LRS over 150 consecutive cycles[50,55].
Fig. 7. Silk fibroin-based memristors prepared by Hota’s research group[61]: (a) The
Fig. 8. The silk fibroin based memristor: (a) Model of silk fibroin based memristor; (b)
Fig. 9. Scheme of electron transport in mesoscopic materials: (a) TEM image of AgNCs@BSA showing a core size of 3−4 nm. AFM topographic image (b) and KPFM image (c) of a AgNC (white circles)-functionalized SF film, the electronic wells (b) are 200 nm in size and (c) have a much lower electric potential due to the accumulation of electrons at the surface, the nano seeds (AgNCs) is 30% (the applied voltage is 500 mV, and the gap between the tip and the sample is 100 nm); (d) the corresponding electric potential; (e) the simulation of Poisson-Nernest-Planck; steady state Ag ion and electron density distributions without (f) and with (g) AgNC; (h) scheme of new mesoscopic functionalized SF materials (left side) and the barrier of metal ion migration (right side); (i) scheme of ion transport under an electric field in new mesoscopic functionalized SF materials (left side) and the corresponding schema of different ion transport paths (right side). Two paths to overcome a high potential barrier of metal ion migration (∆
Fig. 10. Mesoscopic functionalization strategies were used to construct Au-doped silk fibroin-based memristors by Liu's group[68]: (a) Schema of meso-functionalized silk memristor; (b) the 100 times
Fig. 11. Electronic characteristics of meso-devices: (a) Typical current-voltage (
Fig. 12. Schematic structure diagrams illustrating resistances switching mechanism in the pure SF memristor: (a) Initial state; (b) HRS state during corresponding positive sweeps; (c) LRS state, conductive filaments are formed in LRS state during corresponding set sweeps; (d) the device switches to HRS when applied reset voltage corresponds to rupture of the conductive filaments; (e) HRS state during corresponding negative sweeps; (f) the random conductive filaments formed in subsequent repeated sweeps under an electric field; (g) endurance cycles of neat SF memristor[24].
Fig. 13. Schematic structure diagrams illustrating the resistance switching mechanism in AgNC meso-functionalized devices. (a) Current-voltage diagrams representing the resistance state during step-by-step changes in the electric field. (b) Schematic of filament growth dynamics corresponding to the resistance state. The red Ag clusters in the schematic represent mesoscopic functionali-zation in the memristive material; these clusters can act as a positive charge trap when polarized by an external electric field. The arrows indicate the switching direction: (i) Initial state; (ii) HRS state during corresponding positive sweeps; (iii) LRS state, conductive filaments are formed in the LRS state during corresponding set sweeps; (iv) the device remains in the LRS when the applied reverse voltage corresponds to the dissolution of the conductive filaments; (v) the device switches to the HRS when the applied reverse voltage reaches the reset voltage, which corresponds to the rupture of the conductive filaments; (vi) HRS state during corresponding negative sweeps. Well-organized conductive filaments are formed in subsequent repeated sweeps under an electric field. (c) Endurance cycles of Meso-functionalized silk fibroin memristor[24].
Fig. 14. Carbon dots(CDs)-doped silk fibroin-based memristors: (a) Cross-sectional SEM image of the device structure; (b) TEM images of pristine CDs; (c) AFM topographic images of CDs-silk composite film on a mica substrate, scale bar is 300 nm; (d) Ag top electrode, exposed to UV light (λ = 365 nm) with intensity from 0 to 0.15 Mw/cm2 (sweeping rate is 50 mV); (e) distribution of SET voltages without (left) and with (right) UV light treatment; (f) an enlarged SEM image of the conductive filament and EDS spectra in different regions; (g) cross-sectional SEM image of the Au/pentacene/CDs/silk/SiO2/Si device; (h) AFM topographic images of the CDs/silk bicomponent blend film; (i) output characteristics of the memory under dark conditions (left panel) and light illumination (right panel, λ = 365 nm, light intensity: 0.15 Mw/cm2); (j) KPFM image of CDs/silk film after electrons injection through incrementally increasing voltage applied to the tip under dark (left panel) and under UV illumination (right panel); (k) the CPD value of the selected cross sections in (j)[70,71].
Fig. 15. Other functionalized silk fibroin based memristors: (a) Schema of Au nanoparticles functionalized silk memristor; (b)
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Chen-Yang Shi, Guang-Zong Min, Xiang-Yang Liu.
Received: Apr. 27, 2020
Accepted: --
Published Online: Jan. 4, 2021
The Author Email: