A monoamine–dithiol mixture is used to prepare homogeneous Cu(In, Ga)Se2 (CIGSe) molecular precursor solution, which yields a highly sulfur depleted CIGSe thin-film solar cell with a power conversion efficiency of 12.2%.
Boron
nitride nanotubes (BNNTs) are promising nanofillers in polymer
nanocomposites due to their high strength and high modulus as well
as thermal and chemical stability. In BNNTs nanocomposites, the orientation
of BNNTs and interfacial stress transfer between BNNTs and the matrix
determine the nanocomposite performance. In this study, Raman spectroscopy
was used to measure the orientation of BNNTs and interfacial stress
transfer of BNNTs in polyacrylonitrile (PAN) fibers. The orientation
of BNNTs in the nanocomposite fibers could be tuned by postdrawing
fibers, and fibers with higher draw ratios show higher BNNTs orientation.
In addition, fibers with higher draw ratios show a higher Raman band
shift rate than that of low draw ratio fibers, which indicates enhanced
interfacial shear stress between the PAN matrix and BNNTs. This study
shows that highly oriented BNNTs are critical to the mechanical properties
of the BNNTs reinforced polymer nanocomposites.
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