The paper describes for the first time the successful synthesis of Fe(2)O(3)/TiO(2) tube-like nanostructures, in which TiO(2) shell is of quasi-single crystalline characteristic and its thickness can be controlled through adjusting the added amount of aqueous Ti(SO(4))(2) solution. The characterization of samples obtained at different stages using transmission electron microscope indicates that the outer TiO(2) shell is changed gradually from amorphous and polycrystalline phase into quasi-single crystal under thermal actions through the Ostwald ripening process, accompanying the corrosion of the central parts of Fe(2)O(3) nanorods, and the formation of small particles separating each other, leading to the special core/shell nanorods. Furthermore, Fe(2)O(3)/TiO(2) tube-like nanostructures can be transformed into Fe(2)TiO(5) nanostructures after they are thermally treated at higher temperatures. Those nanostructures exhibit enhanced ethanol sensing properties with respect to the monocomponent. Our results imply that not only hollow nanostructures, but also a novel type of nanostructures can be fabricated by the present method for nanodevices.
This brief presents 2-D numerical simulation results of single-event burnout (SEB) in power UMOSFETs (trench-gate MOSFET) and investigates hardening solutions to SEB such as carrier lifetime reduction, emitter doping decrease, and p + plug modification. We find that the linear energy transfer (LET) does not have an important influence on the occurrence of SEB. In addition, we present the effect of a varied ion strike position, and the result is that the position in the middle of the neck is easier to SEB than the other positions. In addition, the single-event gate rupture (SEGR) threshold voltages in different LETs are given in order to compare with SEB.
Index Terms-Linear energy transfer (LET), PowerUMOSFET, SEB hardening solution, single-event burnout (SEB).
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