Improvements in photostability and sensing properties of EuVO4 nanoparticles by microwave-assisted sol–gel route for detection of H2O2 vapors

Abstract

The inorganic thin-film fluorescence probe, with the advantages of long life span and high sensitivity, has attracted much attention in explosive detection. The poor ultraviolet absorption and lack of an aromatic ring make peroxide-based explosives very hard to detect. As the signature compound of peroxide-based explosives, H 2 O 2 vapor detection became more and more important. Rareearth-doped vanadate is considered to be a suitable material for the detection of hydrogen peroxide due to the quenching of its fluorescence in the presence of hydrogen peroxide. Its only drawback lies on its poor photostability. In this work, we have developed a new synthesis to limit the photobleaching of EuVO 4 -based films. We propose herein an original protocol using microwave-assisted solgel route. The photostability of luminescent EuVO 4 has been achieved and the sensitivity has been greatly increased. The detection limit for H 2 O 2 vapor is as low as 100 parts per billion (ppb). The characterization of these nanoparticles by photoelectron spectroscopy clearly correlates their sensitivity to H 2 O 2 to the surface chemistry. Graphical AbstractEuVO 4 : Sensitive material Substrate Measurement system ΔI lum ΔI lum

Preparation and Characterization of Magnetic Fe3O4/CdWO4 and Fe3O4/CdWO4/PrVO4 Nanoparticles and Investigation of Their Photocatalytic and Anticancer Properties on PANC1 Cells

“…The ELISA plate reader was used at λ = 570 nm. The percentage of cell cytotoxicity and viability was achieved using the following relation [29]:cytotoxicity %=1− mean absorbance of toxicantmean absorbance of negative control × 100.…”

“…Semiconductor materials such as ZnS, TiO 2 , WO 3 , and CdS are promising candidates for the degradation of contaminated environments via photocatalytic reactions [25,26]. For example, transition metal-based orthovanadates (MVO 4 ) such as PrVO 4 have the potential to be applied in several fields, including the gas-sensor, solar-cell, catalyst, photoluminescent, and photocatalyst fields [27,28,29,30,31].…”