Naslov
Increased photoconductivity in BaTiO3/TiO2 composites

Autori
Plodinec, Milivoj ; Gajović, Andreja ; Šantić, Ana ; Zavašnik, Janez ; Čeh, Miran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
PROCEEDINGS 3rd CROATIAN MICROSCOPY CONGRESS with International Participation / Andreja Ambriović Ristov, Andreja Gajović, Igor Weber and Ana Vidoš - Zagreb : Institut Ruđer Bošković ; Hrvatsko mikroskopijsko društvo, 2015, 67-68

ISBN
978-953-7941-05-5

Skup
3rd CROATIAN MICROSCOPY CONGRESS with International Participation

Mjesto i datum
Zadar, Hrvatska, 26.04.2015. - 29.04.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
heterojunctions; nanotubes; photoconductivity; vacancies; surface conductivity

Sažetak
BaTiO3 (BTO), is a well-known and widely investigated dielectric material. It is mainly used in capacitors due to its high dielectric constant. The dielectric properties of BTO are controlled by purity and microstructure which are dependent on the methods of preparation. Recent advances in nanotechnology such as MLCC, MEMS, DRAM have resulted in miniaturization of devices [1, 2]. In this work barium titanate TiO2 nanostructured arrays (BTO- TiO2 NT) were synthesized by hydrothermal processing of titanium based precursor (TiO2 nanotube arrays prepared by anodisation of titanium foils) in aqueous solution of BaCl2 and NaOH (Fig. 1.). Structural and compositional properties were investigated by XRD, SEM, EDX, TEM, HRTEM, SAED and Raman spectroscopy (ex–situ and in-situ), while electric measurements were studied by impendence spectroscopy. The persistent photoconductivity (PPC) effect in nanotube arrays of barium titanate and TiO2 (BTO/TiO2NT) was studied at room temperature under daylight illumination. The BTO/TiO2NT heterostructures exhibited a giant PPC effect that was six orders of magnitude higher than the dark conductivity, followed by a slow relaxation for 3 hours . The PPC effect in this material was explained by the existence of defects at the surfaces and the interfaces of the investigated heterostructures. The sample was prepared using a two-step synthesis: the anodization of a Ti-foil and a subsequent hydrothermal synthesis. References: [1] N. A. Hill, J. Phys. Chem. B, 2000, 104, 6694– 6709. [2] M. A. Pena and J. L. G. Fierro, Chem. Rev., 2001, 101, 1981–2018.

Izvorni jezik
Engleski

POVEZANOST RADA