Highly uniform and densely packed ZnO nanowire arrays have been successfully synthesized by a low hydrothermal method combined with Anodic Aluminum Oxide (AAO) template-filling method, and their morphology, structure and luminescence property were investigated in detail. The scanning electron microscopy images indicates that the ZnO nanowire arrays are highly ordered and their diameter and length are about 0.4 and 60 μm, respectively, precisely defined by the pore of the AAO template. Simultaneously, the ZnO nanowire arrays are indexed to hexagonal wurtzite polycrystalline as revealed by X-ray diffraction patterns. The photoluminescence spectrum of ZnO nanowire arrays is resolved into two bands centered at about 470 nm and 510 nm, and which are originated from AAO template and the oxygen vacancies of ZnO nanowire arrays, respectively. It is expected that the ZnO nanowire arrays within AAO template is a promising candidate for development of radiation detection and imaging with ultrafast and high-spatial-resolution.
Photon diagnostic for high-repetition-rates XFEL are treated to be a huge challenge for all the XFEL project, especially the single pulse imager diagnostic. A device has been designed by our team for single pulse photon diagnostics of future CAEP-XFEL project with 2.3ns gap of each pulse in pulse trains. The most popular way to obtain the imager of photon beam is directly seeing it from a scintillators such as YAG:Ce with a common CCD/CMOS camera. However, the gap of pulse to pulse can be around 220ns at a typical high-repetition-rates XFEL facility such as EU-XFEL while the gap may as small as 2.3ns for CAEP-XFEL. In this circumstances, this kind of devices may not be suitable any more. Ultrafast scintillator with the decay time less than 2.3ns and framing camera with sub-nanosecond exposure time may be a feasible way to achieve it. Some research have been done to find the suitable ultrafast scintillator.
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