Abstract
Metal ions with smaller radii than Pb2+ can stabilize CsPbBr3 NCs' cubic structure by lattice shrinkage, but lacking sensing research. Herein, Ni-substituting CsPbBr3 NCs were prepared to rapidly and accurately detect water content (WC) in edible oils. CsPb0.95Ni0.05Br3 NCs had the highest fluorescence intensity, approximately 125% of CsPbBr3 NCs. The results displayed that CsPb0.95Ni0.05Br3 NCs were uniformly quadrilateral crystalline packing (8.78±0.28nm particle size) with inter-planar distances of 0.41, 0.33, and 0.29nm. Given the fluorescence quenching behavior, a superior linear curve between fluorescence-decreased ratio and WC was established within 0-3‰ (v/v) and a detection limitation of 0.042‰. Furthermore, excellent precision and accuracy were verified in various oils with a relative error of 2.06%. It was suggested that water destroyed and dissolved CsPb0.95Ni0.05Br3 NCs' crystal structure to induce fluorescence quenching. Thus, Pb-site substitutions of CsPbBr3 NCs enhanced the sensing performance, enlightening other elements-substituted CsPbBr3 NCs for sensing.
Published Version
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