Nanomagnets La0.8Pb0.2(Fe0.8Co0.2)O3 Assembled with a Bonded Surface Graphene Oxide: Sensitive for Sensing Small Gas Molecules
Abstract:Nanocrystallites La0.8Pb0.2(Fe0.8Co0.2)O3 (LPFC) when bonded through a surface layer (carbon) in small ensembles display surface sensitive magnetism useful for biological probes, electrodes, and toxic gas sensors. A simple dispersion and hydrolysis of the salts in ethylene glycol (EG) in water is explored to form ensembles of the nanocrystallites (NCs) by combustion of a liquid precursor gel slowly in microwave at 70–C80 °C (apparent) in a closed container in air. In a dilute sample, the EG molecules mediate hydrolyzed species to configure in small groups in process to form a gel. Proposed models describe how a residual carbon bridges a stable bonded layer of a grapheneoxide-like hybrid structure on the LPFC-NCs in attenuating the magnetic structure. SEM images, measured from a pelletized sample which was used to study the gas sensing features in terms of the electrical resistance, describe plate shaped NCs, typically 30–C60 nm widths, 60–C180 nm lengths and ∼50 m2/g surface area (after heating at ∼750 °C). These NCs are arranged in ensembles (200–C900 nm size). As per the X-ray diffraction, the plates (a Pnma orthorhombic structure) bear only small strain ∼0.0023 N/m2 and oxygen vacancies. The phonon and electronic bands from a bonded surface layer disappear when it is etched out slowly by heating above 550 °C in air. The surface layer actively promotes selective H2 gas sensor properties.
Document Type: Research Article
Publication date: April 1, 2012
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