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J Am Chem Soc. 2006 Sep 13;128(36):11958-63.

Room-temperature biosynthesis of ferroelectric barium titanate nanoparticles.

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1
Nanoscience Group, Materials Chemistry Division and Biochemical Sciences Division, National Chemical Laboratory, Pune - 411 008, India.

Abstract

The syntheses of inorganic materials by biological systems is characterized by processes that occur close to ambient temperatures, pressures, and neutral pH, as is exemplified by biosilicification and biomineralization processes in nature. Conversely, laboratory-based syntheses of oxide materials often require extremes of temperature and pressure. We have shown here the extracellular, room-temperature biosynthesis of 4-5 nm ternary oxide nanoparticles such as barium titanate (BT) using a fungus-mediated approach. The tetragonality as well as a lowered Curie transition temperature in sub-10 nm particles was established, and the ferroelectricity in these particles was shown using Kelvin probe microscopy.

PMID:
16953637
DOI:
10.1021/ja063011m
[Indexed for MEDLINE]
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