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Ferroelectric yttrium-doped hafnium-zirconium dioxide (Y-HZO) thin films were fabricated by solution process on Pt/Ti/SiO2/Si substrates. Both metal–ferroelectric–metal (MFM) structures with Pt top electrode and metal–ferroelectric–semiconductor (MFS) structures with indium tin oxide (ITO) top electrode were fabricated and characterized. Solution-derived Y-HZO films annealed at 600 °C–800 °C showed ferroelectric properties which were confirmed by polarization–voltage loops (P–V) and capacitance–voltage (C–V) curves. The ferroelectric properties of Y-HZO were superior to those of undoped HZO, Y-doped HfO2 and undoped HfO2 samples. C–V curves showed clear butterfly loops with depletion of top ITO layer in the case of MFS, while no depletion was observed in the case of MFM structures. Large memory window was obtained for MFS structures and ferroelectric properties were observed even after high temperature annealing process during the solution deposition of ITO electrodes. These results suggest that a solution processed Y-HZO is a promising candidate for ferroelectric gate thin film transistor.

The anal secretions of 16 phlaeothripine thrips species (Thysanoptera: Phlaeothripidae) were studied, including a reinvestigation of three species previously reported. A total of 37 components were detected, including hydrocarbons, acetates, terpenes, carboxylic acids, a quinone, an aromatic compound, and a pyranone compound. The secretions of all species were composed of some of these components, with Xylaplothrips inquilinus possessing as many as 11 components. Of these components, (Z)-9-octadecene, (Z)-9-nonadecene, nonadecadiene, octanoic acid, decanoic acid, geranial, neral, alpha-pinene, beta-pinene, caryophyllene, 2-hydroxy-6-methylbenzaldehyde, and two unidentified monoterpenes [UK-I (M+136) and UK-II (M+168)] were detected for the first time. The chemicals were species-specific; four Liothrips species and three Holothrips species could be distinguished from each other and their congeners by the GC profiles of the ether extracts of their anal secretions. The anal secretions of gall-inducing thrips commonly contained terpenes. of which citral (a mixture of geranial and neral) and beta-acaridial repelled ants or had antifungal activity. The findings suggest that these terpenes play a defensive role and prevent galls from fungal infestation. 3-Butanoyl-4-hydroxy-6-methyl-2H-pyran-2-one, found from three Holothrips spp., caused paralysis in ants. Chemical analysis of anal secretion components is a useful method for the classification of tubuliferan species that are difficult to distinguish on the basis of morphological characters.

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