A novel Ln-MOF-based cataluminescence sensor for detection of propionaldehyde

A novel Ln-MOF was synthesized via a facile solvothermal approach and designed for the sensitive detection of propionaldehyde. The Ln-MOF was characterized for its crystal structure, thermal stability, surface morphology, elementary composition, and specific surface area and pore size using powder X-ray diffractometer, Fourier transform infrared spectroscopy, thermal gravimetric analyzer, transmission electron microscopy, scanning electron microscopy, energy dispersive spectrometer and surface and pore analyzer. The CTL mechanism of propionaldehyde on Tb-BTC was discussed by density functional theory and CTL emission wavelength. The exceptional crystalline structure, unique porous morphology, remarkable thermal stability, and efficient energy transfer characteristics would confer advantages for promoting gas transfer at the active sites and improving CTL sensing performance. The response time was 2.2 s and recovery time was 53 s. The usable linear range was 5.45 ∼ 218 mg L-1 (R2 = 0.992), with a low limit detection of 0.039 mg L-1. Furthermore, CTL sensor was successfully detected propionaldehyde in mixed samples with RSDs of 3.56 ∼ 5.04 %. The present study expands the application of Ln-MOF and realized the detection of low concentration propionaldehyde.