A direct and sensitive electrochemical sensing platform based on ionic liquid functionalized graphene nanoplatelets for the detection of bisphenol A (original) (raw)
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Sensing and Bio-Sensing Research, 2015
The synthesis of room-temperature stable ionic liquids was obtained via metathesis reaction, which was accomplished by the reaction 1,10-Phenanthroline monohydrate hydrochloride with lithium-bis(trifluoromethane)sulfonamide in water (shortly, 1,10-PhenanNTf 2 ). The prepared 1,10-PhenanNTf 2 was characterized in details with various conventional methods. Finally, it was mixed with conducting binders and deposited on flat-silver electrode (AgE) to result in a sensor that has a fast response to bisphenol A (BPA) in the phosphate buffer phase (PBP). Features include high sensitivity, low-sample volume, reliability, reproducibility, ease of integration, long-term stability, and enhanced electrochemical responses.
Microchemical Journal, 2019
BSA templated Au-Cu bimetallic nanoclusters (Au-Cu@BSA) were synthesized. The characteristics of the prepared bimetallic nanoclusters were demonstrated by UV-Vis absorption, fluorescence spectrometry and transmission electron microscopy. The Au-Cu@BSA was mixed by graphene nanoribbons (GNRs) and Au-Cu@BSA-GNRs was applied as a modifier of glassy carbon electrode (GCE). Also, the properties of the prepared sensors were investigated by cyclic voltammetry, square wave anodic stripping voltammetry and electrochemical impedance spectroscopy. Au-Cu@BSA-GNRs/GCE was employed for the low cost, high efficiency, rapid, selective and sensitive determination of bisphenol A (BPA) as an effective sensing layer of the electrochemical sensor. Upon the optimization of chemical and instrumental parameters, including pH, deposition potential and time, the oxidation peak current was linearly dependent on the concentration of BPA. The dynamic ranges of BPA were linear between 0.01 to 2.0 and 2.0 to 70 µmol L-1 , with a limit of detection 0.004 µmol L-1. The Au-Cu@BSA-GNRs/GCE has high selectivity, stability, repeatability, and reproducibility. These results suggest that the constructed sensor has an excellent capacity as an alternative to routine analysis methods for the determination of BPA. The constructed electrode was used for electrochemical determination of BPA in tap water, bottled water, baby bottle and food storage container by the standard addition method. The obtained results indicate the ability of the proposed method to detect BPA in different real sample matrices.
Analytical Chemistry, 2020
Bisphenol A, an endocrine disrupting compound, is widely used in food and beverage packaging, and it then leaches in food and source water cycles, and thus must be monitored. Here, we report a simple, low-cost and sensitive electrochemical sensor using graphene oxide and 20 1 functionalized multi-walled carbon nanotubes for the detection of BPA in water. This sensor electrode system combines the high surface area of graphene oxide and carbon nanotubes, and the superior host-guest interaction capability of 20 1 A diffusion-controlled oxidation reaction involving equal numbers of protons and electrons facilitated the electrochemical sensing of BPA. The sensor showed a twostep linear response from 0.05-5 µM and 5-30 : with a limit of detection of 6 nM. The sensors also exhibited a reproducible and stable response over one month with negligible interference from common inorganic and organic species, and an excellent recovery with real water samples. The proposed electrochemical sensor can be promising for the development of simple low-cost water quality monitoring system for monitoring of BPA in water.
Electrochemical Detection of Bisphenol A Using Graphene-Modified Glassy Carbon Electrode
2012
Graphene's nano-dimensional nature and excellent electron transfer properties underlie its electrocatalytic behavior towards certain substances. In this light, we have used graphene in the electrochemical detection of bisphenol A. Graphene sheets were produced via soft chemistry route involving graphite oxidation and chemical reduction. X-ray diffraction, Fourier transform infra-red (FT-IR) and Raman spectroscopy were used for the characterization of the as-synthesized graphene. Graphene exhibited amorphous structure in comparison with pristine graphite from XRD spectra. FTIR showed that graphene exhibits OH and COOH groups due to incomplete reduction. Raman spectroscopy revealed that multi-layered graphene was produced due to low intensity of the 2D-peak. Glassy carbon electrode was modified with graphene by a simple drop and dry method. Cyclic voltammetry was used to study the electrochemical properties of the prepared graphene-modified glassy carbon electrode using potassium ...
Nano-Structures & Nano-Objects, 2017
h i g h l i g h t s • FRET biosensor based on aptamer/functionalized graphene for ultrasensitive detection of bisphenol A. • Qualitative and quantitative detection of BPA were successfully elucidated and realized with limit of detection <1 pg/mL by assessing the change followed by recovery of fluorescent intensity on BPA addition. • We applied the developed sensor for real water (river water, drinking mineral water and tap water) samples because of its facile preparation and manipulation, scalability and excellent performance with good recovery. • The specificity is evaluated by measuring the fluorescent intensity change with BPA analogs (BP, BPB, BPC and DES) for benchmarking this biosensor.
Microchimica Acta, 2016
The main aim of the work was to develop an efficient strategy for preparing molecularly imprinted polymers (MIPs) on the surface of graphene oxide (GO) sheets. Amine functionalization of GO was accomplished by a facile and efficient procedure with 3-aminopropyltriethoxysilane (APTES). Then, the template was immobilized onto aminofunctionalized GO in order to improve the recognition ability of MIP-based sensors. Also, prior to polymerization, ethylene glycol dimethacrylate was grafted onto the APTES coated graphene oxide sheets by the Michael addition reaction. In this way, many homogeneous imprinting sites were formed on the GO sheets. The resulting composite was placed on a glassy carbon electrode (GCE) which then was used for determination of bisphenol A (BPA) by electrochemical technique. The composite of amino-functionalized GO and MIP (GO/ APTES-MIP) was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy. The electrochemical behaviors of the sensors were investigated by cyclic voltammetry and differential pulse voltammetry (DPV) techniques. Compared with non-imprinted polymer, the DPV current response of MIP sensor is about 4.6 times larger. Under the optimized conditions, GO/APTES-MIP sensor displays two linear ranges (from 0.006 to 0.1 μM and 0.2 to 20 μM) for determination of BPA, and the detection limit is 0.003 μM (at an S/N ratio of 3). The MIP-based sensor was applied to the in-situ determination of BPA in milk and mineralised water without any pre-treatment and matrix interfering effects.
Polyaniline/carbon nanotube-graphite modified electrode sensor for detection of bisphenol A
Ionics, 2018
Endocrine disruptors bisphenol A (BPA) have dreadful impacts on both humans and animals. A highly sensitive polyaniline-MWCNT-graphite (PANI-MWCNT-Gr)-base electrode sensor has been developed for the detection of BPA in water. The nanocomposite electrode was fabricated using a facile sol-gel chemical route by the reaction of graphite electrode (Gr) and polyaniline/ multiwall carbon nanotube (PANI/MWCNT). Synergistic electrochemical interaction between MWCNT and PANI boosts electron transfer, resulting improvement in the generated current as compared to bare graphite and other reported electrodes. Consequently, a PANI/MWCNT-Gr-supported electrode sensor shows the unique potential of detecting BPA in a sub-nano range. Prepared nanocomposite electrode has been effectively employed for the detection of BPA in real samples (such as baby feed bottles), with more than 95% accuracy, which could potentially replace conventional detection systems. Advance experiments related to the stability of PANI/MWCNT-Gr-supported nanocomposite electrodes are in progress for replacing carbon electrodes in microbial fuel cells.
Journal of AOAC International, 2016
An electrochemical and sensitive sensing of 2,2-bis(4-hydroxyphenyl) propane [bisphenol A (BPA)] was developed based on a didodecyldimethylammonium bromide-modified expanded graphite paste electrode (DDAB-EGPE). The DDAB-EGPE was prepared by suspending an EGPE in a DDAB aqueous solution, and allowing the DDAB to form a hydrophobic film on the expanded graphite surface. Compared with the EGPE, the DDAB-EGPE showed improved electrochemical response of BPA because of the preconcentration of BPA in DDAB via hydrophobic interaction. Due to the electrocatalytic activity of BPA, a sensor for BPA was constructed based on the DDAB-EGPE. The DDAB-EGPE exhibited a wide linear response to BPA ranging from 6.0 × 10(-8) to 2.0 × 10(-5) mol/L with a detection limit of 7.1 nmol/L at S/N = 3. The designed sensor showed good reproducibility and stability. The proposed sensor was successfully applied to the determination of BPA in three types of real plastic product samples. This sensor presented a si...