Contact potential induced enhancement of magnetization in polyaniline coated nanomagnetic iron oxides by plasma polymerization

TitleContact potential induced enhancement of magnetization in polyaniline coated nanomagnetic iron oxides by plasma polymerization
Publication TypeJournal Article
Year of Publication2013
AuthorsSethulakshmi, N, Sooraj, V, Sajeev, US, Nair, SS, Narayanan, TN, Joy, LK, Joy, PAlias, Ajayan, PM, Anantharaman, MR
JournalApplied Physics Letters
Volume103
Issue16
Pagination162414
Date PublishedOCT
ISSN0003-6951
Abstract

The present work derives motivation from the so called surface/interfacial magnetism in core shell structures and commercial samples of Fe3O4 and gamma Fe2O3 with sizes ranging from 20 to 30 nm were coated with polyaniline using plasma polymerization and studied. The High Resolution Transmission Electron Microscopy images indicate a core shell structure after polyaniline coating and exhibited an increase in saturation magnetization by 2 emu/g. For confirmation, plasma polymerization was performed on maghemite nanoparticles which also exhibited an increase in saturation magnetization. This enhanced magnetization is rather surprising and the reason is found to be an interfacial phenomenon resulting from a contact potential. (C) 2013 AIP Publishing LLC.

DOI10.1063/1.4826459
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

3.515

Divison category: 
Physical and Materials Chemistry