This paper reports the way for the synthesis of nanoplate VO2 (B) particles with controlled morphology. Nanoplate VO2 (B) particle was synthesized by hydrothermal method. Microstructure of VO2 (B) particles were controlled by hydrothermal temperatures and use of Zn doping into VO2 (B) matrix. The microstructure of the particles was shifted from nanowires to nanoplate morphology by changing of hydrothermal temperatures. The doping of Zn into VO2 nanoparticles resulted in an effective achievement of VO2 (B) phase. In addition, luminescence of VO2 (B) nanoparticle was also controlled by the use Zn doping. These results suggest that the potential application of Zn doped VO2 (B) particles for potential application in optical and energy techniques.

Recently, lead halide perovskite nanocrystals have been considered as potential light-emitting materials because of their narrow full width at half-maximum (FWHM) and high photoluminescence quantum yield (PLQY). In addition, they have various emission spectra because the bandgap can be easily tuned by changing the size of the nanocrystals and their chemical composition. However, these perovskite materials have poor long-term stability due to their sensitivity to moisture. Thus far, various approaches have been attempted to enhance the stability of the perovskite nanocrystals. However, the required level of stability in the mass production process of perovskite nanocrystals under ambient conditions has not been secured. In this work, we developed a facile two-step ball-milling and ethanol/water-induced phase transition method to synthesize stable CsPbBr3 perovskite materials. We obtained pure CsPbBr3 perovskite solutions with stability retention of 86% for 30 days under ambient conditions. Our materials show a high PLQY of 35% in solid films, and excellent thermal stability up to 80 °C. We believe that our new synthetic method could be applicable for the mass production of light-emitting perovskite materials.

Climate change has adversely affected the agriculture of indigenous farmers. Farmers can lessen agricultural losses by using adaptation strategies to climate change. However, the adaptation process depends on several factors, including barriers. This paper examines the farmers’ opinion toward adaptation barriers and tries to identify how the barriers influence farmers’ adaptation intention. We collected data from 362 randomly selected farmers by using face to face interview method and focus group discussions in Backan province, Vietnam. The severity index technique was applied to calculate farmers’ perception of barriers and climate change vulnerability indexes, and we used the probit model to determine the factors affecting farmers’ adaptation intention. The results indicate that farmers identified 10 internal factors and 14 external barrier factors that influence the adaptation intention. Moreover, probit model confirmed that farmers’ adaptation intention was significantly affected by education level, major occupation, income, lack of technical process, high cost of farm labor, lack of access to pesticides, and lack of technical officers. As a result, climate vulnerability indexes and barriers, and adaptation factors should be considered for designing and performing the policies in the future for indigenous farmers.

In this article, micro-/nano urchin-like VO2 particles were successfully synthesized by hydrothermal method. Vanadium pentoxide (V2O5), oxalic acid (C2H2O4) and sodium dodecyl sulfate (SDS) surfactant were used as reagents for the synthesis of VO2. The article reports on the synthesis procedure of VO2 nanorods and micro-/nano urchin-like VO2 structure and evaluates the methylene blue (MB) adsorption properties. Morphology and particle size of VO2 were observed by FE-SEM. The VO2 formation phase was studied by XRD. Raman spectroscopy was also used for characterizing VO2. Micro-/nano urchin-like VO2 structure shows good MB adsorption properties that have potential applications in dye-contaminated water treatment.

No abstract