Thick AlN crystals were grown by conventional hydride vapor phase epitaxy (HVPE) on AlN/sapphire templates under low pressure (∼15 Torr) at high temperature (1100°C–1200°C). Colorless, mirror-like AlN films were obtained at the growth rates of up to 20.6 µm/h. The best root mean square (RMS) value of atomic force microscope (AFM) observations for the AlN surface was 2.34 nm. The typical values of full width half maximum (FWHM) of X-ray rocking curves for (0002) and (1012) diffraction of AlN films were 173–314 arcsec and 1574–1905 arcsec, respectively. We also investigated the influences of carrier gas, growth temperature and growth rate on the crystal quality.
Thick AlN crystals were grown by conventional hydride vapor phase epitaxy (HVPE) on AlN/sapphire templates under low pressure (∼15 Torr) at high temperature (1100 °C-1200 °C). Colorless, mirror-like AlN films were obtained at the growth rates of up to 20.6 µm/h. The best root mean square (RMS) value of atomic force microscope (AFM) observations for the AlN surface was 0.19 nm in a surface of 5×5 µm 2 .The typical values of full width half maximum (FWHM) of X-ray rocking curves for (0002) and (101 2) diffraction of AlN films were 173-314 arcsec and 1574-1905 arcsec, respectively. We also investigated the influences of carrier gas, growth temperature and growth rate on the crystal quality.
Japan is one of the resource-rich countries in the world from the standpoint of "urban mine", and the establishment of simple, low-cost and environment-friendly technology for noble metal recovery is the urgent issue to be solved. In this study, the nonwoven fabric which can adsorb gold ions selectively was developed using nanofiber with extremely high specific surface area as an adsorbent. The nanofiber material useful for gold ion adsorption was explored, and as a result, it was found out that nylon 6 has a great affinity for gold ions. The nanofiber nonwoven fabric was prepared by depositing nylon 6 nanofibers produced by electrospinning method. The mean diameters of nanofibers produced in this study were 143 and 206 nm at the nylon 6 concentrations of 10 and 20 wt%, respectively. The nonwoven fabric with thinner fibers has higher adsorption capacity due to larger specific surface area. The adsorption test of a mixture of Au 3+ , Cu 2+ , Al 3+ and Fe 3+ was also performed. As a result, only gold ions could be selectively adsorbed to the nylon 6 nanofiber nonwoven fabric. Moreover, the desorbability of gold ions adsorbed to the fabric was increased by shifting the immersion fluid to the higher pH environment.
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