SummaryThe effect of palladium doping of zinc oxide nanoparticles on the photoluminescence (PL) properties and hydrogen sensing characteristics of gas sensors is investigated. The PL intensity shows that the carrier dynamics coincides with the buildup of the Pd-related green emission. The comparison between the deep level emission and the gas sensing response characteristics allows us to suggest that the dissociation of hydrogen takes place at PdZn-vacancies ([Pd 2+(4d9)]). The design of this sensor allows for a continuous monitoring in the range of 0–100% LEL H2 concentration with high sensitivity and selectivity.
We
reported the synthesis and full characterization of ultralong
Bi2S3 nanowires with diameters of 60–80
nm and lengths above 1 μm, showing growth in the [001] direction.
Combining the computed lattice dynamics of orthorhombic Bi2S3 with the experimental micro-Raman scattering study
provided comprehensive solutions. We demonstrate that 10 active modes
originated from Raman symmetry modes (4Ag + 2B1g + 3B2g + 1B3g), and the peak at 124 cm–1 is due to the IR-active B3u mode. The
use of the Bi2S3 catalyst for dewatering hexavalent
chromium-containing wastewater was also reported. This confirms it
to be a potential candidate for photocatalytic environmental remediation.
Saltwater intrusion is a common phenomenon in Southern Vietnam, but salinization is becoming more serious due to the rising sea level related to climate change. Among potential methods for water desalination, the application of halophytic microalgae is gaining high interest. This study investigated the effect of Chlorella vulgaris (C. vulgaris) microalgae on reducing water salinity at different media (Bold Basal Medium and Sea Salt Medium) and in different salt concentrations (1 - 30 g/L). The results indicated that C. vulgaris microalgae had good growth in all mediums used and contributed to lowering the salt content from 20% to 40% after 15 days of cultivation.
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