Label-free upconversion nanosensor for water safety monitoring of permanganate and dichromate ions.

Water contaminated with heavy metal ions poses serious threat to the human health and environment protection. It is imperative to develop analytical tools to detect heavy metal ions. Herein, we propose autofluorescence free SiO modified upconversion nanosensor for label-free and fast determination of MnO and CrO anions.

Upconversion luminescent nanomaterials: A promising new platform for food safety analysis.

Foodborne diseases have become a significant threat to public health worldwide. Development of analytical techniques that enable fast and accurate detection of foodborne pathogens is significant for food science and safety research. Assays based on lanthanide (Ln) ion-doped upconversion nanoparticles (UCNPs) show up as a cutting edge platform in biomedical fields because of the superior physicochemical features of UCNPs, including negligible autofluorescence, large signal-to-noise ratio, minimum photodamage to biological samples, high penetration depth, and attractive optical and chemical features.

Synthesis and structural properties of thermoelectric Ca3-xAgxCo4O9+δ powders.

A series of Ca3-xAgxCo4O9+δ (0 ≤ x ≤ 0.2) powders is prepared by the Pechini sol-gel method. The effect of dispersants on the size and morphology of the Ca2.