Interstitial Defects Induced Ferroelectricity in Undoped ZnO Nanorods at Room Temperature


Autoria(s): Ghosh, Moumita; Rao, Mohan G
Data(s)

2013

Resumo

A simple approach for obtaining room temperature ferroelectricity in ZnO rod structures at the nanoscale is reported. A systematic comparative study between two kinds of nanorods prepared by different processes reveals the physics behind it. It is observed that ZnO nanorods grown (in-situ) by a sol gel method on platinum substrate show ferroelectric behaviour. On the contrary, ZnO nanorods first grown by a sol gel method and then spin-coated on a platinum substrate (ex-situ) do not demonstrate this kind of feature. X-ray diffraction analysis confirms partially (002) and (100) plane oriented growth of both samples. From photoluminescence (PL) spectral analysis it is interpreted that oxygen vacancies/zinc interstitial defects, which arises from the large lattice mismatch between the Pt substrate and the ZnO nanorods grown thereon, and preferential ZnO growth along 002], can be causes of this type of phenomena. C-V characterization, P-E hysteresis loop along with piezoelectric force microscopy support this observation.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/47312/1/sci_adv_mat_5-7_733_2013.pdf

Ghosh, Moumita and Rao, Mohan G (2013) Interstitial Defects Induced Ferroelectricity in Undoped ZnO Nanorods at Room Temperature. In: SCIENCE OF ADVANCED MATERIALS, 5 (7). pp. 733-739.

Publicador

AMER SCIENTIFIC PUBLISHERS

Relação

http://dx.doi.org/10.1166/sam.2013.1511

http://eprints.iisc.ernet.in/47312/

Palavras-Chave #Centre for Nano Science and Engineering #Instrumentation and Applied Physics (Formally ISU)
Tipo

Journal Article

PeerReviewed