Enhanced dielectric properties of BaTiO₃nanocube assembled film in metal–insulator–metal capacitor structure

Abstract

In this study, a BaTiO3 (BT) nanocube assembly with metal–insulator–metal capacitor structure was fabricated by a dip-coating process. The BT nanocube assembly had relatively ordered structure after sintering. A high dielectric constant of approximately 3000 was achieved, with relatively low loss tangent. The enhanced dielectric properties of the nanocube assembled film were robust against thickness variation. We conjecture that the mechanism that enhanced the dielectric constant of the BT nanocube assembly is also contributed to by the effect of interfacial lattice strain between neighboring nanocubes.

Dielectric properties of barium zirconate titanate nanocube 3D-ordered assemblies

“…For comparison, the changes of capacitance and loss of BT NC assembly were also plotted in the same figure. 13) As the top electrodes on BT and BZT NC assemblies after measurement were broken by repetitive probing which was inevitable against the unexpected heat expansion of the sample stage, the correct dielectric constant could not be determined. This is serious problem to understand the properties of NC assemblies.…”

Multiferroic nanocomposite fabrication via liquid phase using anodic alumina template

“…As for achieving the absolute filling of nanotubes, supercritical fluid impregnation [24], vacuum impregnation [25,26], electrophoretic deposition of BTO nanoparticles [27], and the combination of them will work; thus, they are currently under investigation in our research group. On the other hand, BTO nanoparticle assembly has shown enhanced dielectric properties compared to bulk BTO [28]. Moreover, a possibility of drastic modulation of Curie temperature and piezoelectricity with controlling the pore structure of BTO has recently been reported [29]; thus, the property improvement of our nanocomposite can be well expected.…”

Measurement of Barium Ion Displacement Near Surface in a Barium Titanate Nanoparticle by Scanning Transmission Electron Microscopy

“…Because there has been a strong demand to downsize these devices in recent years, ferroelectric materials of smaller scale such as nanoparticles (NPs), has been intensively studied (Arlt et al, 1985;Frey & Payne, 1996;Imanaka et al, 2013;Mimura & Kato, 2014;Tsurumi et al, 2006;Varghese et al, 2013;Zhao et al, 2004). Although it is well known that dielectric and ferroelectric properties of BTO NP primarily depend on the particle sizes (Hoshina et al, 2008;Huan et al, 2014;Imanaka et al, 2013;Smith et al, 2008;Tsurumi et al, 2006;Varghese et al, 2013;Zhao et al, 2004), clear understanding for the size effect has not been obtained.…”