Electrochemical Growth of Highly Oriented Organic−Inorganic Superlattices Using Solid-Supported Multilamellar Membranes as Templates

Abstract

Controllable depositing of relatively thick inorganic sublayers into organic templates to fabricate organic-inorganic superlattices is of great importance. We report a novel approach to fabricating phospholipid/Ni(OH)(2) superlattices by electrochemical deposition of the inorganic component into solid-supported multilamellar templates. The well-ordered and highly oriented multilamellar templates are produced by spreading small drops of lipid solution on silicon surfaces and letting the solvent evaporate slowly. The templates which are used as working electrodes preserve the lamellar structure in the electrolyte solution. The resulting superlattices are highly oriented. The thickness of the nickel hydroxide is controlled by the concentration of nickel ions in the electrolyte bath. The electron density profiles derived from the X-ray diffraction data reveal that the thickness of the nickel hydroxide sublayers increases from 15 to 27 A as the concentration of nickel nitrate increases from 0.005 mol/L to 0.08 mol/L. We expect that the new method can be extended to depositing a variety of inorganic components including metals, oxides, and semiconductors.

New Development in the Preparation of Micro/Nano-Wires of Molecular (Magnetic) Conductors

“…However, a reliable silicon wafer-based method favoring the selective growth of nanowires was necessary. Li and his colleagues modified one-side surface of a silicon wafer with a photochemically-bridged multi-lamellar membrane of phospholipid molecules having two conjugated carbon-carbon triple bonds in each long alkyl chain, 1,2-bis(10,12-tricosadiynoyl)- sn -glycero-3-phosphocholine (DC 8,9 PC ) (Figure 38) and succeeded in the formation of Ni(OH) 2 -based nano-size sublayers incorporated in the open space between the lamellar layers by the electrochemical reduction of an Ni(NO 3 ) 2 aqueous solution using this modified silicon wafer as an electrode [36]. …”

Nanowires of molecule-based charge-transfer salts

“…As thin films of this new phase do not grow on neat silicon, we have decided to use a Si-supported multilemallar membrane as template, following a recently published procedure. 10 This work reports a new approach for fabricating organic-inorganic superlattices by electrochemical deposition of nickel hydroxide into solid-supported multilamellar templates. The well-ordered multilamellar templates are produced by spreading small drops of lipid solution on Si surfaces and allowing the solvent to evaporate slowly.…”

“…Each alkyl chain has two conjugated carbon-carbon triple bonds which can polymerize by irradiation with UV light. 10 In ref. 10, the interheadgroup spacings are filled with nickel nitrate aqueous solution.…”

“…Electrodeposition of (EDT-TTFVO) 4 (FeCl 4 ) 2 nanowires was performed on hydrophilic silicon-supported multilamellar membranes prepared according to the method described before. 10…”

Biomimetic Block Copolymer Membranes

“…Solid supported membranes can also be seen as a perspective platform for sensors [21] or templates for inorganics growth. [22] …”