Vertically-Ordered Mesoporous Silica Films for Electrochemical Detection of Hg(II) Ion in Pharmaceuticals and Soil Samples

Abstract

Rapid and simple determination of mercury ion (Hg2+) in pharmaceuticals and soil samples is vital for human health and the environmental monitoring. Vertically-ordered mesoporous silica films (VMSF) supported by the indium tin oxide (ITO) electrode surface were prepared by electrochemically assisted self-assembly method and utilized for electrochemical detection of Hg2+. Owing to the negatively charged channel walls and ultrasmall pore diameter, VMSF displays obvious cationic selectivity and has highly electrostatic interaction for Hg2+, giving rise to the strong electrochemical signals. By recording the anodic stripping signals of adsorbed Hg2+ using differential pulse voltammetry, quantitative detection of Hg2+ was achieved with a wide linear range (0.2 μM–20 μM) and a low limit of detection (3 nM). Furthermore, considering the anti-fouling and anti-interference capacity of VMSF, the proposed VMSF/ITO sensor has been successfully applied to detect Hg2+ in pharmaceuticals and soil samples without tedious pretreatment processes of samples.

Disposal Immunosensor for Sensitive Electrochemical Detection of Prostate-Specific Antigen Based on Amino-Rich Nanochannels Array-Modified Patterned Indium Tin Oxide Electrode

“…Moreover, the cost is low, and it can be prepared in batches in a large area, so it is an ideal electrode modification material. VMSF can be stably modified on indium tin oxide (ITO) electrodes [ 52 , 53 ]. This is attributed to the covalent bonding between VMSF and the ITO surface through the formation of -Si-O-In- or -Si-O-Sn- bonds.…”

Fabrication of a Ratiometric Fluorescence Sensor Based on Carbon Dots as Both Luminophores and Nanozymes for the Sensitive Detection of Hydrogen Peroxide

“…Nanomaterials usually exhibit novel optical/electrical/magnetic properties and have a high specific surface area due to their unique microstructure and nanoscale size [ 33 , 34 , 35 ]. In recent years, the use of various functional nanomaterials to construct novel sensing systems has attracted much attention [ 36 , 37 , 38 , 39 ]. As 0D fluorescent carbon nanomaterials, carbon dots (CDs) have the advantages of a wide range of synthetic raw materials and good biocompatibility and have been widely applied in the development of advanced fluorescence sensors.…”

Nanochannel array modified three-dimensional graphene electrode for sensitive electrochemical detection of 2,4,6-trichlorophenol and prochloraz

“…Decorating electrodes with vertically ordered mesoporous silica-nanochannel film (VMSF) is an effective way to improve their anti-interference and anti-fouling capabilities ( Zhou et al, 2022c ; Ma et al, 2022 ; Zhang et al, 2022 ; Zou et al, 2022 ). VMSFs have uniform and ordered arrays of nanochannels with adjustable diameters (2–11.8 nm, usually 2–3 nm), nanoscale film thicknesses (commonly 30–290 nm), and high porosity (∼75000 pore/μm ( Henry and Sisler, 1984 )) ( Yan and Su, 2016 ; Zhou et al, 2020 ; Walcarius, 2021 ).…”