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Optoelectronic property of ZnO epitaxial layer grown by plasma-assisted epitaxy at temperature as low as 340°C using Ti2O3 buffer layer on a-sapphire were studied by low temperature photoluminescence at 10 K comparing to the layers on c-sapphire and a-sapphire without the buffer layer. The near band-edge emission consisting of free-exciton emissions and neutral-donor bound exciton emissions was significantly dependent on the buffer thickness and dominated by the free-exciton emissions in the layer grown on the very thin buffer layer about 0.8 nm, whereas the intense emissions by neutral-donor bound excitons were observed in the ZnO layer on c-sapphire. The structural behavior indicated the donor was originated from the three-dimensional growth of ZnO layer and details of the optoelectronic feature suggested the residual donors were Al and interstitial-Zn.
A 4-week low dosage (500 mg/day) L-carnitine supplementation in combination with motivation training was carried out in 24 overweight (BMI 25.8 - 26.6 kg/m2) Japanese males in the course of a double-blind randomized placebo-controlled study. L-carnitine motivated group showed significant body weight loss and a decrement of serum triglyceride level vs. the non-motivated placebo group. Serum adiponectin levels increased in both L-carnitine supplemented groups. The beneficial effects of L-carnitine were amplified by motivation training. For clinical evaluation of supplements, whose efficacy is potentially affected by inter-individual life style variability, supportive motivation training might be advisable for future clinical trials.
Pentacene thin layers were deposited on Si with the native oxide at 80°C
by remote-plasma-assisted deposition (RPAD) using hydrogen-plasma cell to
supply atomic hydrogen radicals. The deposition rate was increased by RPAD comparing
to that by non-excited hydrogen gas supply whereas thermal evaporation rate of
pentacene from crucible was same in the both process. DFM and XRD studies
showed the grain laterally grew in the thin film phase with the size above 10 μm
by RPAD. First-principles molecular orbital calculations suggested pentacene is evaporated from crucible as the trimer or larger cluster but
atomic hydrogen penetrated into the cluster enhances cracking of pentacene
clusters to the monomer.
Plasma-assisted chemical vapor deposition (PCVD)
at pressure as low as 3 mtorr using titanium-tetra-isopropoxide (TTIP) and oxygen mixed gas plasma
generated by 13.56 MHz radio frequency power (RF-power) below 70 W were applied to deposit titanium-oxide layer at
temperature under 40°C. Plasma optical emission spectroscopy and FTIR indicated
that density of OH group in the amorphous layer was related to the density of
OH or H2O in the plasma and the species was formed on electrode to
induce the RF-power. Hydrophilicity on the layer was dependent on the density
of chemisorbed OH, but was
degraded by the excess OH. The PCVD-TiOx coating was demonstrated
on polyethylene terephthalate and showed good hydrophilic property with the
contact angle of water about 5°.