High-sensitive and selective Eu3+ electrochemical sensor based on LaB6 electrode and sodium dodecylbenzene sulfonate

Ma, Xiaofu; Xu, Zhinan; Yuan, Huatang; He, Yunyun; Xiao, Dingquan; Choi, Martin M.F.

doi:10.1016/j.snb.2010.02.061

Cited by 19 publications

(32 citation statements)

References 36 publications

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“…It can be seen that depressed semicircles and typical angles between 45° and 90° exist for the linear region with respect to the Z re and Z im axes, indicating that a nonideal capacitor known as constant phase element (CPE) is present (Figure E). , CPE is generally considered to originate from the distribution of double layer capacitance along the electrode interface as a result of surface inhomogeneity, which in this case should be due to the roughness of the MWCNT modification . A model equivalent circuit (Figure F) adapted from a previous study was found to most adequately fit the EIS data . It contains the solution resistance ( R s ), which contains the resistance of the supporting electrolyte and the film (Nafion alone or MWCNT + Nafion) resistance, the charge-transfer resistance of the electrochemical reaction of the redox couple ( R ct ), the CPE corresponding to the double layer capacitance ( C dl ) of the electrode ( Z Q ), and the finite thickness Warburg diffusion impedance of Eu 3+ for the electrode ( Z O ).…”

Section: Resultsmentioning

confidence: 88%

“…It has many important applications in industry, materials science, and life sciences due to its unique electronic and optical properties . With the increasing use of europium, continuous exposure to it is a concern for potential health issues, yet few regulations have been proposed to monitor europium levels in industry . To date, commonly applied techniques for trace europium determination (mainly through the detection of Eu 3+ ) are inductively coupled plasma atomic mass spectrometry, graphite furnace and tungsten coil electrothermal atomic absorption spectrometry, UV–vis absorption spectrophotometry, and luminescence. − Although quite sensitive and accurate, those techniques typically require sample pretreatment and expensive apparatus.…”

mentioning

confidence: 99%

“…Chemically modified electrodes can also be exploited to preconcentrate analyte of interest through a selective interaction between the electrode and the analyte prior to voltammetric quantitation . Until now, two main electrochemical preconcentration methods have been developed for europium sensing through the reduction of Eu 3+ to Eu 2+ : mercury electrode-based adsorptive stripping voltammetry and Nafion-modified electrode-based preconcentration voltammetry. − Also, recent work using a LaB 6 electrode in conjunction with the surfactant sodium dodecylbenzenesulfonate has been reported to sensitively detect Eu 3+ by differential pulse voltammetry …”

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confidence: 99%

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Carbon Nanotube-Loaded Nafion Film Electrochemical Sensor for Metal Ions: Europium

et al. 2014

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A Nafion film loaded with novel catalyst-free multiwalled carbon nanotubes (MWCNTs) was used to modify a glassy carbon (GC) electrode to detect trace concentrations of metal ions, with europium ion (Eu(3+)) as a model. The interaction between the sidewalls of MWCNTs and the hydrophobic backbone of Nafion allows the MWCNTs to be dispersed in Nafion, which was then coated as a thin film on the GC electrode surface. The electrochemical response to Eu(3+) was found to be ∼10 times improved by MWCNT concentrations between 0.5 and 2 mg/mL, which effectively expanded the electrode surface into the Nafion film and thereby reduced the diffusion distance of Eu(3+) to the electrode surface. At low MWCNT concentrations of 0.25 and 0.5 mg/mL, no significant improvement in signal was obtained compared with Nafion alone. Scanning electron microscopy and electrochemical impedance spectroscopy were used to characterize the structure of the MWCNT-Nafion film, followed by electrochemical characterization with Eu(3+) via cyclic voltammetry and preconcentration voltammetry. Under the optimized conditions, a linear range of 1-100 nM with a calculated detection limit of 0.37 nM (signal/noise = 3) was obtained for determination of Eu(3+) by Osteryoung square-wave voltammetry after a preconcentration time of 480 s.

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Section: Resultsmentioning

confidence: 88%

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confidence: 99%

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confidence: 99%

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Carbon Nanotube-Loaded Nafion Film Electrochemical Sensor for Metal Ions: Europium

et al. 2014

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“…EIS was used to investigate the impedance changes at the electrode surface caused by the modification process and the effect of the ratio of CNFs to Nafion (expressed as weight of CNFs to volume of Nafion solution, mg/mL) in the preparation used to coat the GC (Figure ). Figure a shows the Randle’s equivalent circuit used to fit the impedance data. ,, The circuit is made up of solution resistance ( R s ) which contains the resistance of supporting electrolyte and the electrode film (CNFs and Nafion) resistance, the charge transfer resistance of the electrochemical reactions of the redox couple ( R ct ), the CPE corresponding to the double layer capacitance ( C dl ) of the electrode ( Z Q ), and the finite thickness Warburg diffusion impedance of Ru(bpy) 3 2+ for the electrode ( Z O ). (Detailed information about the model equivalent circuit is included in the Supporting Information, and the fitting values of the parameters are summarized in Table S1.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Carbon Nanofiber Modified Electrodes for Stripping Voltammetry

et al. 2015

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Electrospun polyacrylonitrile (PAN) based carbon nanofibers (CNFs) have attracted intense attention due to their easy processing, high carbon yield, and robust mechanical properties. In this work, a CNF modified glassy carbon (GC) electrode that was coated with Nafion polymer was evaluated as a new electrode material for the simultaneous determination of trace levels of heavy metal ions by anodic stripping voltammetry (ASV). Pb(2+) and Cd(2+) were used as a representative system for this initial study. Well-defined stripping voltammograms were obtained when Pb(2+) and Cd(2+) were determined individually and then simultaneously in a mixture. Compared to a bare GC electrode, the CNF/Nafion modified GC (CNF/Nafion/GC) electrode improved the sensitivity for lead detection by 8-fold. The interface properties of the CNF/Nafion/GC were characterized by electrochemical impedance spectroscopy (EIS), which showed the importance of the ratio of CNF/Nafion on electrode performance. Under optimized conditions, the detection limits are 0.9 and 1.5 nM for Pb(2+) and Cd(2+), respectively.

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“…In recent years, several electrode sensors have been developed to select Eu(III). − They make the analysis simpler and are able to detect specific species in situ and in real time. These results inspired us to explore the combination of Ln(III) ions with electron-transfer (ET) photochromic behavior, which may allow us to achieve a unique way to Ln(III) ion sensing.…”

Section: Introductionmentioning

confidence: 99%

Photochromic Lanthanide(III) Materials with Ion Sensing Based on Pyridinium Tetrazolate Zwitterion

2019

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Lanthanide(III) ion (Ln(III)) sensing has become a major research area owing to its intriguing prospect in clinic, biology, and environmental studies. However, the existing methods have limitations like requirement of expensive instrumentation, long analytical times, and sample pretreatments, revealing the necessity of other methods. In this work, by using N -methyl-4-pyridinium tetrazolate (mptz) zwitterion as an electron acceptor, we obtained several new Ln(III) compounds with electron-transfer (ET) photochromic properties: [Ln(NO 3 ) 3 (H 2 O) 4 ]·mptz [Ln = Sm ( 1 ), Eu ( 2 ), Gd ( 3 ), La ( 4 ), Ce ( 5 ), Pr ( 6 ), Nd ( 7 ), Tb ( 8 ), Dy ( 9 ), Ho ( 10 ), Er ( 11 ), Tm ( 12 ), Yb ( 13 ), Lu ( 14 )]. Notably, different Ln(III) ions in these compounds can be visually identified by their different photoinduced color changes related to the ET process. This work may not only contribute to the more understanding of the structure–photosensitivity relationships of pyridinium-based compounds, but also provide a new approach for Ln(III) ion sensing.

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High-sensitive and selective Eu3+ electrochemical sensor based on LaB6 electrode and sodium dodecylbenzene sulfonate

Cited by 19 publications

References 36 publications

Carbon Nanotube-Loaded Nafion Film Electrochemical Sensor for Metal Ions: Europium

Carbon Nanotube-Loaded Nafion Film Electrochemical Sensor for Metal Ions: Europium

Electrospun Carbon Nanofiber Modified Electrodes for Stripping Voltammetry

Photochromic Lanthanide(III) Materials with Ion Sensing Based on Pyridinium Tetrazolate Zwitterion

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