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

Abstract

We report a nanodot (ND) floating gate memory (NFGM) with a high-density ND array formed by a biological nano process. We utilized two kinds of cage-shaped proteins displaying SiO2 binding peptide (minTBP-1) on their outer surfaces: ferritin and Dps, which accommodate cobalt oxide NDs in their cavities. The diameters of the cobalt NDs were regulated by the cavity sizes of the proteins. Because minTBP-1 is strongly adsorbed on the SiO2 surface, high-density cobalt oxide ND arrays were obtained by a simple spin coating process. The densities of cobalt oxide ND arrays based on ferritin and Dps were 6.8 × 10(11) dots cm(-2) and 1.2 × 10(12) dots cm(-2), respectively. After selective protein elimination and embedding in a metal-oxide-semiconductor (MOS) capacitor, the charge capacities of both ND arrays were evaluated by measuring their C-V characteristics. The MOS capacitor embedded with the Dps ND array showed a wider memory window than the device embedded with the ferritin ND array. Finally, we fabricated an NFGM with a high-density ND array based on Dps, and confirmed its competent writing/erasing characteristics and long retention time.

Estimation of charge effects of ultrafine channel utilizing junctionless transistor with nanodot-type floating gate

“…This matches their respective work functions in a descending order when the core center is assumed to reduce upon metallization annealing in the reduction atmosphere at the last step of the preparation process. 29) In particular, for the device using cobalt oxide NPs, V th shifts to the positive direction, which corresponds to the high-work-function gate electrode required for n-type JL-FETs. 30) Subsequently, NPs were used as a floating gate during programming, and I D -V G was characterized with charges accumulated in the NPs.…”

CNT Binding Peptides Selected by the Phage Display Method

“…The mutant ferritin or Dps adsorbed on the specific positions of the devices and made the nanostructures as designed. Using the Bio Nano process, we fabricated prototypes of floating gate memory, − Re RAM, dye-sensitized solar cells, , and quantum nanodisk devices. − …”

Biotemplated Synthesis of TiO2-Coated Gold Nanowire for Perovskite Solar Cells

“…19,28−30 The BNP approach has also been effective in the field of inorganic hybrid material production, which improves the performance of electronic devices. Applications cover wide and expanding areas, such as random-access memory, 31,32 Li-ion batteries, 33,34 DSSCs, 35,36 and thermoelectric devices. 37…”

“…When inorganic-binding peptides are also decorated on the artificial protein surface, it is possible to locate protein conjugates with nanomaterials on a specific area of the substrate and selectively make a two-dimensional (2D) layer. ,− The BNP approach has also been effective in the field of inorganic hybrid material production, which improves the performance of electronic devices. Applications cover wide and expanding areas, such as random-access memory, , Li-ion batteries, , DSSCs, , and thermoelectric devices …”