Development and characterization of ion-imprinted sol–gel-derived fluorescent film for selective recognition of mercury(II) ion

Abstract

In this work, an ion-imprinted fluorescent sensor by combining sol-gel processing and spin coating was developed. Fluorescent functional silane was first synthesized and reacted with tetramethoxysilane to obtain solgel-derived materials and then used as a receptor for selective removal and sensing of Hg 2? in aqueous solution. Ion-imprinted material synthesized in the presence of Hg 2? was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, N 2 adsorptiondesorption analysis and thermogravimetric analysis by comparing with non-imprinted material obtained in the absence of Hg 2? . Surface area, pore volume and diameter were analyzed from the profile of nitrogen adsorption. It was observed that fluorescent sol-gel film exhibits distinctive change in fluorescence emission upon interaction with Hg 2? . Steady-state fluorescence experiments were performed for spectral characterization of the films, and the advancement of the reaction was defined. The shift in emission maxima and other spectral changes of the different matrices have been identified, and gelation time of sol-gel network was revealed by monitoring the emission of fluorescent silane in pre-gel solution. The corresponding selectivity factors of the imprinted fluorescent film toward Hg 2? against the other analogs were evaluated. Graphical AbstractKeywords Optical sensor Á Sol-gel thin film Á Mercury ion-imprinting Á Fluorescence sensing

Development of an Electrochemical Sensor Based on Covalent Molecular Imprinting for Selective Determination of Bisphenol‐A

“…Figure B displays the most evident infrared absorption bands, indicating the production of sol‐gel polymers. The band observed at 1068 cm −1 in both of two samples indicates the existence of Si−O stretching vibration . N−H bending peak at 1630 cm −1 is clearly visible for BPA‐IP, indicating the formation of amino groups after chemical cleavage of urethane bonds.…”

Nanomaterial-based optical sensors for mercury ions

“…Therefore, it is of great importance to research and develop sensitive sensing strategies for the recognition and detection of Hg 2+ in biological and environmental systems. Traditionally reported approaches available to monitor Hg 2+ in aqueous samples include atomic absorption spectrometry [5,6], atomic fluorescence spectrometry [7-9], inductively coupled plasma-mass spectrometry [10,11], fluorometry [12][13][14][15][16] and electrochemical analysis [17][18][19][20][21][22]. Recently, liquid crystal based sensor system and resonance Rayleigh scattering aptasensor are also be used to detect Hg 2+ [23,24].…”

An Electrochemical Sensing Platform Based on Graphene Oxide and Molecularly Imprinted Polymer Modified Electrode for Selective Detection of Amoxicillin

“…Prior to synthesis of AMOX ‐imprinted GO composite ( MIP‐GO ), GO was functionalized with siloxane groups. For this purpose, 100 mg of synthesized GO nanoparticles was dispersed in a 100 mL solution containing ethanol/water/TMOS (80/10/10, v/v) via a sonicator bath for 45 minute and 0.65 mL of 0.1 M HCl was added, and then solution was refluxed at 70 °C for 3 h to condensate the TMOS chemically bounded on the GO nanosheets surface [42]. The pH of the pregel solution containing siloxane functionalized GO (GO‐SiOH) nanohybrids was adjusted to pH 7.0 with 0.1 M NaOH solution (Figure 1).…”