Selective Detection of Chromate and Permanganate Ions Using Gallic Acid Capped CaF:Tb Nanocrystals.

In this study, we have developed ligand-sensitized Ln-doped nanocrystals (NCs) for the selective sensing of CrO and MnO ions in nanomolar concentrations. This is accomplished with the gallic acid capped-CaF:Tb NCs. These NCs display bright green emission through an efficient energy transfer from surface functionalized gallic acid molecules to Tb ions upon UV light excitation.

4-Mercaptobenzoic acid capped terbium(III)-doped CaF nanocrystals: a fluorescent probe for nitroaromatic pollutants.

The authors report on an energy transfer based fluorometric approach for the detection of nitroaromatic pollutants. This is achieved using 4-mercaptobenzoic acid (4-MBA)-capped CaF:Tb nanocrystals that were synthesized by a microwave procedure. 4-MBA acts as both a capping agent and a sensitizer for the Tb ions in CaF host matrix.