Dye-Encapsulated Lanthanide-Based Metal–Organic\nFrameworks as a Dual-Emission Sensitization Platform for Alachlor\nSensing

Abstract

As\nan important factor affecting global agricultural output, pesticides\nhave a significant impact on the ecosystem. It is an urgent task to\naccurately and conveniently detect pesticide residues after their\napplication. Herein, a fluorescent dye@MOF platform was designed via\nthe encapsulation of rhodamine B (RhB) into the MOF structure (named\nRhB@<b>HNU-48</b>), which can significantly enhance the sensing\nsensitivity of alachlor with an ultralow detection limit of 0.59 ppb.\nThe improved sensitivity of RhB@<b>HNU-48</b> to pesticides\nwas attributed to the host–guest interactions that affect the\nexcitation and emission spectra of the composites. Based on the sensing\ncapability of RhB@<b>HNU-48</b>, a logic gate was built to evaluate\nthe safety level of alachlor residues in rivers and soil. The preparation\nof photofunctionalized MOF composites through modulation of host–guest\ninteractions offers a promising strategy for the construction of desired\nsensors for agricultural residues.