One-step electrodeposition of a molecularly imprinting chitosan/phenyltrimethoxysilane/AuNPs hybrid film and its application in the selective determination of p-nitrophenol

Abstract

This paper presents the fabrication of a molecularly imprinting sol-gel hybrid film by the one-step electrodeposition of the constitutional individuals including chitosan (CS), phenyltrimethoxysilane (PTMS), in situ formed gold nanoparticles (AuNPs) and template p-nitrophenol (p-NP). The electrodeposition was triggered by applying an optimal potential at -0.30 V vs. SCE, leading to the formation of the p-NP imprinting CS/PTMS/AuNPs hybrid film on a glassy carbon electrode (GCE) with a roughly architectural and conductive nature, as revealed by scanning electron microscopy and electrochemical impedance analysis. The mechanism of the hybrid film formation was discussed accordingly. Upon complete removal of the template molecules assisted by cyclic voltammetry, the p-NP imprinted film modified electrode exhibited differential pulse voltammetric (DPV) responses to p-NP in a linear range from 3.0 × 10(-8) to 3.5 × 10(-4) M with a detection limit of 5.0 × 10(-9) M. The selectivity and reusability of the sensor was demonstrated by discriminating the p-NP response from its analogues and successive rebinding/debinding cycles, respectively. The methodology is extendable as a simple and general platform for developing hybrid film sensors for the specific determination of various electrochemically active species.

A Facile Approach to Preparing Molecularly Imprinted Chitosan for Detecting 2,4,6-Tribromophenol with a Widely Linear Range

“…The results show that the imprinted one had a lower electron transport barrier, presumably due to the existence of porous binding sites after the template removal. The decrease in interfacial impedance is desirable, because it can decrease both the interfacial resistance drop of the electrode current and overpotential, leading to the enhancement of sensorial sensitivity [37]. …”

A facile approach for synthesizing molecularly imprinted graphene for ultrasensitive and selective electrochemical detecting 4-nitrophenol

“…It can be seen that the GR/ MIPs sensor offered lower detection limit than most of other sensors. We also did a comparison of GR/MIPs with other MIPs [16,44,45] for detection of 4-NP. Although the detection limit is not improved, the detection linear range of our GR/MIPs sensor is much wider.…”

“…In this route, vinyl group functionalized graphene was used as supporting materials which was prepared by noncovalently attaching 4-vinylcarbazole onto graphene via p-p interaction. 4-Nitrophenol (4-NP), one of the nitrophenols cited in the list of priority pollutants of the U.S.A. Environmental Protection Agency (EPA) due to its toxicity and persistence [25], was used as the template molecule in this work. The subsequent selective free radical polymerization (FRP) of monomers and crosslinker on the surface of vinyl group functionalized graphene was carried out in the presence of 4-NP, leading to the generation of GR/MIPs composite.…”

Electrochemical determination of 4-nitrophenol using uniform nanoparticle film electrode of glass carbon fabricated facilely by square wave potential pulses

“…In this method, the electrode materials play a key role in improving the detection performances. Up to now, many kinds of active materials, including carbon nanomaterials [8][9][10][11][12][13][14][15][16], noble metal nanoparticles [17], inorganic salt/complex [18][19][20], ionic liquids (ILs) [21], organic compound/polymer [22][23] and composite [24][25][26][27], have been synthesized physically/chemically at first and then coated onto a solid substrate or dispersed into a conductive matrix to prepare the modified electrodes for the determination.…”