Study of lithium-conducting ceramics Li1.3Al0.3Ti1.7(PO4)3 with the nasicon structure

NASICON-type Li1.3Al0.3Ti1.7(PO4)3 ceramics with a high-density was obtained from powders synthesized from a liquid-phase precursor. The technological scheme of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte production is given. It is established that at 800 °C a single-phase well-crystallized Li1.3Al0.3Ti1.7(PO4)3 is formed. The ionic conductivity of the sintered Li1.3Al0.3Ti1.7(PO4)3 tablets (density 88–90 %) was 1,9·10–4 S/cm at room temperature, and the electronic conductivity did not exceed 5·10–10 S/cm. The Li+ ion transfer number, measured by potentiostatic chronoamperometry, was 0.99, indicating that the solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 is a purely ionic conductor.

One-Step Solution Deposition of Antimony Selenoiodide Films via Precursor Engineering for Lead-Free Solar Cell Applications

Ternary chalcohalides are promising lead-free photovoltaic materials with excellent optoelectronic properties. We propose a simple one-step solution-phase precursor-engineering method for antimony selenoiodide (SbSeI) film fabrication. SbSeI films were fabricated by spin-coating the precursor solution, and heating. Various precursor solutions were synthesized by adjusting the molar ratio of two solutions based on SbCl3-selenourea and SbI3. The results suggest that both the molar ratio and the heating temperature play key roles in film phase and morphology. Nanostructured SbSeI films with a high crystallinity were obtained at a molar ratio of 1:1.5 and a temperature of 150 °C. The proposed method could be also used to fabricate (Bi,Sb)SeI.

Varying chiral ratio of Pinic acid enantiomers above the Amazon rainforest

Chiral chemodiversity plays a crucial role in biochemical processes such as insect and plant communication. However, the vast majority of organic aerosol studies do not distinguish between enantiomeric compounds in the particle phase. Here we report chirally specified measurements of secondary organic aerosol (SOA) at the Amazon Tall Tower Observatory (ATTO) at different altitudes during three measurement campaigns at different seasons. Analysis of filter samples by liquid chromatography coupled to mass spectrometry (LC-MS) has shown that the chiral ratio of pinic acid (C9H14O4) varies with increasing height above the canopy. A similar trend was recently observed for the gas-phase precursor α-pinene, but more pronounced. Nevertheless, the measurements indicate that neither the oxidation of (+/−)-α-pinene nor the incorporation of the products into the particulate phase proceeds with stereo preference and that the chiral information of the precursor molecule is merely transferred to the low-volatility product. The observation of the weaker height gradient of the present enantiomers in the particle phase at the observation site can be explained by the significant differences in the atmospheric lifetimes of reactant and product. Therefore, it is suggested that the chiral ratio of pinic acid is mainly determined by large-scale emission processes of the two precursors, while meteorological, chemical, or physicochemical processes do not play a particular role. Characteristic emissions of the chiral aerosol precursors from different forest ecosystems, in some cases even with contributions from forest related fauna, could thus provide large-scale information on the different contributions to biogenic secondary aerosols via the analytics of the chiral particle-bound degradation products.

Recoil Implantation Using Gas-Phase Precursor Molecules

Ion implantation underpins a vast range of devices and technologies that require precise control over the physical, chemical, electronic, magnetic and optical properties of materials. A variant termed “recoil implantation”...

Facile construction of N-doped carbon nanotubes encapsulating Co nanoparticles as a highly efficient multifunctional catalyst for electrochemical reactions

A multifunctional electrocatalyst, N-doped carbon nanotubes encapsulating Co nanoparticles (Co@NCNTs), has been synthesized by a facile solid-phase precursor pyrolysis method. It displays high performance for the ORR, OER and HER in alkaline medium.

Facile preparation of a cobalt diamine diketonate adduct as a potential vapor phase precursor for Co3O4films

A novel heteroleptic Co(ii) complex has been synthesized, characterized and successfully evaluated as a precursor for the CVD of Co3O4 thin films with tailored properties.

Modified MAX Phase Synthesis for Environmentally Stable and Highly Conductive Ti3C2 MXene

One of the primary factors limiting further research and the commercial use of the two-dimensional (2D) MXene titanium carbide (Ti3C2), as well as MXenes in general, is the rate at which freshly made samples oxidize and degrade when stored as aqueous suspensions. Here, we show that including excess aluminum during synthesis of the Ti3AlC2 MAX phase precursor leads to the creation of Ti3AlC2 grains with improved stoichiometry and crystallinity. Ti3C2 nanosheets produced from the improved Ti3AlC2 are of higher quality, as evidenced by their increased resistance to oxidation and an increase in their electrical conductivity to 20,000 S/cm. Our results indicate that defects created during the synthesis of Ti3C2 (and by inference, other MXenes) lead to the previously observed instability. We show that by eliminating those defects results in Ti3C2 that is highly stable in aqueous solutions and in air. Aqueous suspensions of single- to few-layer Ti3C2 flakes produced from the modified Ti3AlC2 have a shelf life of over ten months, compared to one to two weeks for Ti3C2 produced from conventional Ti3AlC2, even when stored in ambient conditions. Freestanding films made from Ti3C2 suspensions stored for ten months show minimal decreases in electrical conductivity and negligible oxidation. Oxidation of the improved Ti3C2 in air initiates at temperatures that are 100-150°C higher than conventional Ti3C2. The observed improvements in both the shelf life and properties of Ti3C2 will facilitate the widespread use of this material. <br>