We have developed a piezoelectric sensor for the determination of atrazine. It is based on the modification of a molecularly
imprinted film of TiO2 that was placed on a quartz crystal via a surface sol–gel process. The resulting sensor exhibits high selectivity for atrazine,
a re-usability that is better than that of other sensors, a response time of 3min, a wider linear range (0.0005–8mM), and
a lower detection limit (0.1μM). The analytical application of the atrazine sensor confirms the feasibility of atrazine determination.
Graphical abstractThe response of QCM electrodes prepared by various methods to atrazine (pH 5.0).
"Moreover, this device is a widely used sensing device when combined with MIP materials. In the reported studies describing MIP-based QCM sensors     , the advantageous stability and selectivity of MIP materials and the sensitivity of the QCM sensor might combine effectively. However, some challenges have appeared, including the need to enhance the signal response and achieve selective analyte binding, restricting the development and application of MIP-based QCM sensors. "
[Show abstract][Hide abstract] ABSTRACT: This study describes the development of a poly(amidoamine) (PAMAM) dendrimer-based molecularly imprinted biomimetic QCM sensor for methimazole (MMI) determination. This report is the first involving a PAMAM dendrimer as a functional monomer used during the imprinting process to enhance the amount of recognition sites in the polymer matrix to improve the recognition ability. The PAMAM dendrimer (3.0 generation) was first grafted using methacrylic acid (MAA), and the obtained PAMAM-MAA monomer was characterized using FT-IR and NMR spectra. Furthermore, an MMI imprinted material using PAMAM-MAA as a functional monomer was synthesized and modified on the surface of a quartz crystal Au electrode to develop a novel molecularly imprinted biomimetic QCM sensor. Through evaluation over a series of experiments, the QCM sensor exhibited significant selective adsorption, as well as recognition for the template, and provided a highly selective and sensitive strategy for determining the MMI in urine samples. At three spiked concentrations (2.0 mg L−1, 4.0 mg L−1, 8.0 mg L−1) in different urine samples, the recoveries for the measurements ranged from 84.4% to 91.7% with SD of 1.4-6.3% (n = 3), indicating that the prepared sensor has high accuracy and precision for determining MMI in complex biological samples.
Sensors and Actuators B Chemical 02/2015; 207:588-595. DOI:10.1016/j.snb.2014.10.103 · 4.10 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Environmental and health safety requires thorough determination of hazardous compounds and drugs of abuse. In determinations of these analytes, traditional instrumental analytical techniques often suffer from tedious assay procedures.Biosensors are simpler to construct and faster in use, so they can better meet the analytical demands in determination of these biohazards. However, their stability and reproducibility when operating under harsh conditions are poor, so artificial recognition units have become attractive as replacements for natural receptors in sensing applications.Molecular imprinting is one of the most powerful tools for preparing materials that can bind analytes reversibly and selectively in the presence of their interferents.This review critically evaluates the development of chemical sensing of biohazards and drugs of abuse using the molecular-imprinting approach to recognition in combination with different ways of analytical signal transduction.We compile analytical parameters of the molecularly-imprinted receptors, identify difficulties in the determinations encountered and highlight proposed solutions to problems.
[Show abstract][Hide abstract] ABSTRACT: TiO2 nanotube array is a novel inorganic functional material, its unique chemical and physical properties such as chemical inertness, gas sensitivity, dielectric effect, biocompatibility, better photocatalytic activity and resistance to chemical and light attacks, especially excellent photocatalytic activity, which resulted in many researches and applications in various fields such as storage and utilization of solar energy, environmental clean, catalyst, and photocatalytic degradation of pollutants. TiO2 nanotube array has been successfully used as photoanodes to transfer solar energy to electric energy, which provides a new way to our energy supply. As a highly efficient catalyst, TiO2 nanotube array has also transferred macromolecules such as dyes and other persistent pollutants into small molecules like CO2 and H2O, which will play an important role in the reduction of pollutants in environment. Meanwhile it can transfer CO2 to hydrocarbons by reduction reaction which cuts down not only the amounts of CO2 in atmosphere but also hydrocarbon fuel gases like CH4 that speed up carbon cycle, and further decrease the greenhouse effects. As a special functional material, it has been proved to be used in monitoring COD value and pollutants in environmental mediums based on its electrochemical properties, and also enriching pollutants at trace or ultratrace levels. Moreover, doping or modification will lead to the migration of the adsorption spectra of the TiO2 nanotube array to visible region, and enhance the effective use of solar energy. Due to the advantages of low cost and environmental friendliness, more attention has been put on TiO2 nanotube arrays for the reduction and monitoring of environmental pollutants. This review focused on the photocatalytic degradation of pollutants and applications in environmental analytical chemistry of TiO2 nanotube arrays in recent years, and provided a reference for developing new techniques for treatment and monitoring of pollutants and widened the potential of TiO2 nanotube arrays.
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