Chemical sensors based on periodic mesoporous organosilica @NaYF₄:Ln³⁺ nanocomposites

Abstract

Here, three unique organic-inorganic hybrid nanocomposite materials prepared by combining NaYF4: Yb3+, Ln3+ (Ln3+ = Er3+, Tm3+, Ho3+) and periodic mesoporous organosilica (PMO) are proposed for both metal ion sensing...

Recent advances in fluorescent materials for mercury(ii) ion detection

“…Based on this principle, many lanthanide-based fluorescent probes have been developed in recent years, including the sensor of Hg 2+ ions. 154–162…”

“…Based on this principle, many lanthanide-based uorescent probes have been developed in recent years, including the sensor of Hg 2+ ions. [154][155][156][157][158][159][160][161][162] In 2010, Liu et al 163 reported for the rst time a highly selective Hg 2+ ion probe based on the lanthanide complex. They designed and synthesized novel pendant benzo crown ether using a benzo-15-crown-5 unit as a macrocyclic receptor and Nbenzylsalicylamide as a chromophore and coordination unit.…”

Periodic mesoporous organosilica based sensor for broad range mercury detection by simultaneous downshifting/upconversion luminescence

“…10 nM), [74][75][76] it transpires that our turn off fluorescence chemical sensor could be employed firstly as a LnPMOs sensitive probe for Hg 2+ ion quantification in aqueous conditions at a wide detection range. Furthermore, up to date, only few mercury sensors based on LnPMOs have been reported as the turn-on fluorescence chemical sensor, 34,36 so it is hard to compare these materials with the LnPMOs from our work (Table 1).…”

“…It was not until the late 2010s that the field of chemical sensing emerged, coalescing around a small number of articles that sparked the research. [32][33][34][35][36] These works, especially concerning Hg 2+ sensing, constitute the only current knowledge, and as such, the field has received scant attention in the research literature. This is likely because the lanthanide hybrid materials with large detection range suffer from poor luminescent properties and low sensitivity towards cations.…”

“…37 To circumvent the narrow detection range of high sensitivity ion sensors, this study was set out to combine the large detection range of LnPMOs with the high sensitivity of rhodamine B thiolactone dye coupled upconversion luminescence nanoparticles (UCNP + RBT) (Scheme 1). On top of downshifting chemical sensors, upconversion luminescence (UCL) has emerged as a promising method for sensing (ion sensing, temperature sensing, solvent sensing) [38][39][40][41] and bioimaging. 42 UCL of rare-earth nanophosphors is a multi-photon absorption or energy transfer process that converts low-energy light into higher-energy visible light.…”