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Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes

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Floating gate memory with charge storage dots array formed by Dps protein modified with site-specific binding

Hiroki Kamitake¹, Mutsunori Uenuma, Naofumi Okamoto

¹Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara 630-0192, Japan.

|April 22, 2015

Summary

Researchers developed a high-density nanodot array memory using a biological process. Cage-shaped proteins accommodated cobalt oxide nanodots, enabling efficient fabrication of novel nanodot floating gate memory (NFGM) devices.

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Area of Science:

Materials Science
Nanotechnology
Biotechnology

Background:

Developing high-density memory arrays is crucial for advanced electronic devices.
Biological self-assembly offers a promising route for precise nanomaterial fabrication.
Controlling nanodot size and density is key for memory performance.

Purpose of the Study:

To report a novel nanodot (ND) floating gate memory (NFGM) utilizing a biological nano process.
To demonstrate the formation of high-density cobalt oxide nanodot arrays using protein templates.
To evaluate the performance of NFGM devices based on these bio-fabricated nanodot arrays.

Main Methods:

Utilized cage-shaped proteins (ferritin and Dps) displaying SiO2 binding peptide (minTBP-1) to accommodate and position cobalt oxide nanodots.
Controlled nanodot diameters by leveraging the cavity sizes of ferritin and Dps proteins.
Fabricated high-density nanodot arrays via spin coating and subsequent embedding in metal-oxide-semiconductor (MOS) capacitors.

Main Results:

Achieved high-density cobalt oxide nanodot arrays with densities of 6.8 × 10^11 dots cm^-2 (ferritin) and 1.2 × 10^12 dots cm^-2 (Dps).
Dps-based nanodot arrays exhibited a wider memory window in MOS capacitors compared to ferritin-based arrays.
Fabricated NFGM devices using Dps nanodot arrays demonstrated competent writing/erasing characteristics and long retention times.

Conclusions:

Biological nano processes using protein templates enable precise control over nanodot size and high-density array formation.
Dps protein-templated cobalt oxide nanodot arrays offer superior performance for NFGM applications.
This approach presents a viable method for fabricating high-performance nanodot floating gate memory.