EXPLORING INORGANIC MATERIALS: FROM MOLECULAR SOLAR THERMAL (MOST) ENERGY SYSTEMS TO SOLID-STATE SEMICONDUCTORS
The rapid growth in the field of N,C-chelate organoborate photochemistry over the past ten years has inspired for research in energy storage. N, C- chelate photochromic organoborates were investigated as potential molecular solar thermal (MOST) energy conversion systems. Nine photochromic boron compounds were selected as the target compounds and converted to their respective photoisomers (“dark” isomers). The catalytic conversion of these high energy photoisomers back to the low energy starting materials using electron acceptors/oxidants was investigated. Trityl tetrakis(pentafluorophenyl)borate was successful at converting the respective “dark” isomers of ppyB(Mes)(3,5-bistrifluorophenyl), (2-ph-py)BMes2 and (5-BMes2-2-ph-py)BMes2 to their respective parent isomers. PpyB(Mes)(3,5-bistrifluorophenyl) was fully recovered when using tris(pentafluorophenyl)borane. Catalytic amounts of trityl fully recovered (2-ph-py)BMes2 in C6D6 but 5 mol% trityl was not enough to recover (5-BMes2-2-ph-py)BMes2. The stability of this photoisomer and the relatively low cost of CD2Cl2 favors this system for energy harvesting. Room temperature semiconductor detectors are an important class of gamma-ray sensors because they can generate high-resolution spectra at ambient operating temperatures. This work focuses on the development of high performance, low cost γ-ray detector material, CsPbBr3 at room temperature. Polycrystalline CsPbBr3 was produced (97% yield) from Cs2CO3 and Pb(NO3)2 via solution chemistry routes and its powder X-ray Diffraction (XRD) patterns indicated that they were of the room temperature orthorhombic phase. Despite, the lack of a reference material for CsPbBr3, we establish a method validation of inductively coupled plasma mass spectrometry (ICP-MS) for impurity detection and quantification. The validation includes the performance parameters linearity, range, repeatability (single laboratory precision), instrument limit of detection, limit of quantification. Apart from Cr and Se, a linear increase of detected concentration was observed amongst these elements only. Using method of standard addition, only Tl, In and Sb recovered concentrations comparable to their original values. The segregation of impurities was investigated in three sections cut from an ingot purified by zone refining. The total impurity levels of the zone-refined samples range from 15.7 ± 1.3 to 54.6 ± 1.2 μg/g and depends on the position of the samples within the ingot. ICP-MS also proved that zone refining is effective in producing detector materials.
URI for this recordhttp://hdl.handle.net/1974/28185
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