Enhanced chemosensing activity of Schiff base ligand through quantum dot hybridization: Silver and zinc quantum dot-based hybrid receptors for lanthanum ion detection
摘要
A previously reported Schiff base receptor (H2L) showed strong sensitivity for lanthanum ions (Ka = 2.09×107 M−1, LOD = 5.89×10−8 M). To improve performance, H2L was hybridized with silver (Ag) and zinc (Zn) nanoparticles, forming Ag@H2L and Zn@H2L. These hybrids were characterized by TEM, DLS, UV-vis, fluorescence, and optical analysis. Ag@H2L displayed exceptional sensitivity and selectivity (Ka = 2×109 M−1, LOD = 2.8×10−10 M), surpassing both H2L and Zn@H2L (Ka = 1.47×107 M−1, LOD = 1.41×10−7 M). Results confirm that nanoparticle hybridization, especially with Ag, greatly enhances chemosensory efficiency for lanthanum ion detection.
Graphical abstractA Schiff base receptor (H2L) and its nanoparticle-based hybrids, Ag@H2L and Zn@H2L, were developed for selectivelanthanum (La3+) ion sensing. Hybridization with Ag nanoparticles significantly enhanced fluorescence intensity, binding affinity, and detection sensitivity due to π-conjugation and surface effects, resulting in superior sensingperformance (Ka = 2×109 M−1, LOD = 2.8×10−10 M) compared to H2L and Zn@H2L.