Silole‐Infiltrated Photonic Crystal Films as Effective Fluorescence Sensor for Fe³⁺ and Hg²⁺

Abstract

We develop a highly effective silole-infiltrated photonic crystal (PC) film fluorescence sensor with high sensitivity, good selectivity and excellent reproducibility for Fe(3+) and Hg(2+) ions. Hexaphenylsilole (HPS) infiltrated PCs show amplified fluorescence due to the slow photon effect of PC because the emission wavelength of HPS is at the blue band edge of the selected PC's stopband. The fluorescence can be quenched significantly by Fe(3+)/Hg(2+) ions owing to electron transfer between HPS and metal ions. The amplified fluorescence enhances the sensitivity of detection, with a detection limit of 5 nM for Fe(3+)/Hg(2+) ions. The sensor is negligibly responsive to other metal ions and can easily be reproduced by rinsing with pure water due to the special surface wettability of PC. As a result, a highly effective Fe(3+)/Hg(2+) ions sensor based on HPS-infiltrated PC film has been achieved, which will be important for effective and practical detection of heavy metal ions.

Luminescent films for chemo- and biosensing

“…94 HPS-infiltrated PC film was fabricated by dripping HPS ethanol solution on the P(St-AM) PC films. 94 HPS-infiltrated PC film was fabricated by dripping HPS ethanol solution on the P(St-AM) PC films.…”

Silsesquioxane‐Based Hexaphenylsilole‐Linked Hybrid Porous Polymer as an Effective Fluorescent Chemosensor for Metal Ions

“…Although the normal π‐π interaction distance is about 3–4 Å, the extensive crosslinked structures and the twisted arrangements of the peripheral aromatic rings inhibit the metal ions with larger diameters from approaching HPS . The diameters of the metal ions are listed as follows: Fe 3+ , 1.1 Å; Ru 3+ , 1.4 Å; Cu 2+ , 1.5 Å; Co 2+ , 1.3 Å; Cd 2+ , 1.9 Å; Sr 2+ , 2.4 Å; Al 3+ , 1.1 Å; Sn 4+ , 1.4 Å; Ni 2+ , 1.4 Å; Ag + , 2.3 Å; Hg 2+ , 2.0 Å; Ca 2+ , 2.0 Å; Zn 2+ , 1.5 Å; Mn 2+ , 1.3 Å; Li + , 1.5 Å ,. This is why many metal ions whose standard electrode potentials are high enough but cannot lead to the fluorescence quenching, e. g. Ag + and Hg 2+ .…”

Fluorescent Terpolymers via In Situ Allocation of Aliphatic Fluorophore Monomers: Fe(III) Sensor, High‐Performance Removals, and Bioimaging

“…Iron, an essential trace element of many proteins and enzymes, plays dominant roles in metabolism and oxygen uptake. Though moderate concentration of Fe(III) is crucial in living systems, the deficiency or overloading causes biological disorders, such as endotoxemia, hepatic cirrhosis, hereditary hemochromatosis, and Alzheimer's, Huntington's, and Parkinson's diseases . Thus, sensing and removal of Fe(III) is tantamount for environment and human health.…”