Electric property measurement of free-standing SrTiO₃ nanoparticles assembled by dielectrophoresis

Abstract

Free-standing strontium titanate (SrTiO 3 /STO) nanoparticles (NPs) were synthesized by the sol-gel method. X-ray diffractometry revealed that the required minimum annealing temperature to synthesize pure and highly crystalline STO NPs was 500 °C. Moreover, morphological observation by field emission scanning electron microscopy showed that the STO NPs have a spherical structure and their size depended on annealing condition. Electrical properties were measured using a low-temperature probing system. Here, an electrode was fabricated by electron beam lithography and the synthesized STO NPs were aligned at the electrodes by dielectrophoresis. The conductance of a sample was proportional to temperature. Two conduction mechanisms originating from hopping and tunneling appeared in the Arrhenius plot.

Wirelessly powered dielectrophoresis of metal oxide particles using spark‐gap Tesla coil

“…For example, it is used in the assembly of single GaAs nanowires (NWs) for photodetectors [15] and in GaN nanoarchitecture assembly for field-effect transistors [16]. In our previous work, we utilized the DEP technique to place SrTiO 3 nanoparticles between two electrodes and measure their electrical properties [17]. In the biological science field, DEP has also been utilized for trapping microorganisms [18,19], cell separation and characterization [1,[20][21][22][23], preventing membrane fouling in bioreactors [24], and bacterial isolation [25].…”