Potentiometric determination of nanomolar concentration of Cu (II) using a carbon paste electrode modified by a self-assembled mercapto compound on gold nanoparticles

Mashhadizadeh, Mohammad Hossein; Ramezani, Soleyman; Ebrahimi, Saeed

doi:10.1016/j.snb.2012.04.086

Cited by 29 publications

(17 citation statements)

References 33 publications

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“…Preparation of AuNPs/sol-gel process was concisely depicted in Scheme 2. The UV-Vis spectrum shows a peak at 527 nm which is indicative of the formation of AuNPs in the colloidal solution Mashhadizadeh et al 2012). Also the UV-Vis absorption spectrum of SGAN shows a wide peak at the maximum wavelength of about 590.6 nm implying on the dispersion and self-assembling of AuNP in MPTS sol-gel texture (Fig.…”

Section: Preparation Of Aunps and Sganmentioning

confidence: 92%

“…Colloidal gold nanoparticles were firstly prepared and then densely dispersed into the sol-gel network (SGAN) closely Scheme 2 Figurative representation of CCAE/SGAN sensing platform preparation pathway as discussed previously (Mashhadizadeh et al , 2012(Mashhadizadeh et al , 2013. Preparation of AuNPs/sol-gel process was concisely depicted in Scheme 2.…”

Section: Preparation Of Aunps and Sganmentioning

confidence: 99%

“…The performance of the electrodes was investigated by measuring the emfs of silver nitrate solution which was prepared with a concentration range of 2.2 9 10 -1 to 4.0 9 10 -11 mol L -1 by serial dilution. All measurements were implemented at *25°C (more details are exactly similar to the previously reported works) Mashhadizadeh et al 2012Mashhadizadeh et al , 2013Mashhadizadeh et al , 2015.…”

Section: General Proceduresmentioning

confidence: 99%

“…Carbon paste electrodes (CPEs) are one of the most interesting ISEs. These kinds of electrodes are inexpensive and possess many advantages such as low background current, easy fabrication and rapid renewal, broad potential window (-1.40 to ?1.30 V), chemical modifiability and suitability for various sensing and detecting applications Mashhadizadeh et al 2012Mashhadizadeh et al , 2015. The main reason of modification of CPEs is to improve sensitivity, selectivity, durability, and stability of response of the electrochemical measurements by preconcentrating the target analyte from a dilute solution on the electrode surface (Hu et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The main reason of modification of CPEs is to improve sensitivity, selectivity, durability, and stability of response of the electrochemical measurements by preconcentrating the target analyte from a dilute solution on the electrode surface (Hu et al 2016). The operation mechanism of such CMCPEs depends drastically on the properties of the modifier materials used to enhance durability, selectivity, and sensitivity toward the target species (Mashhadizadeh et al 2012.…”

Section: Introductionmentioning

confidence: 99%

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Silica gel/gold nanoparticles/(NS)2 ligand nanoporous platform-modified ionic liquid carbon paste electrode for potentiometric ultratrace assessment of Ag(I)

Ramezani

Mashhadizadeh

Ghobadi

et al. 2016

Int. J. Environ. Sci. Technol.

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A novel ionic liquid carbon paste electrode has been developed using sol-gel/Au nanoparticle (SGAN) involving (NS) 2 compound of N,N 0 -di-(cyclopentadienecarbaldehyde)-1,2-di(o-aminophenylthio) ethane (CCAE) as an appropriate neutral ion-carrier for ultrahigh-sensitive potentiometric determination of Ag(I). Colloidal gold nanoparticles (AuNPs) also well dispersed self-assembly into the 3-(mercaptopropyl)-trimethoxysilane (MPTS)-derived sol-gel network through Au-S covalent bond engendering continuous and super-conductive nanoporous three-dimensional array. The room-temperature ionic liquid, 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMIM.PF 6 ), was applied as a super-conductive pasting agent (binder). The SGAN/CCAE/IL-CPE exhibited a significantly enhanced sensitivity and preferential selectivity toward Ag(I) over a wide concentration range of 2.4 9 10 -9 to 2.2 9 10 -2 mol L -1 (R 2 = 0.9996) with a lower limit of detection of 7.9 9 10 -10 M and a Nernstian slope of 58.5 (±0.3) mV decade -1 . The electrode has a short response time of *5 s and long-time durability of about 2 months without any considerable divergence in potentials. Moreover, the potentiometric examinations could be carried out within the wide pH range of 3.5-9.5. Eventually, the practical utility of the proposed Ag(I)-sensor was evaluated by volumetric titration of AgNO 3 solution by sodium chloride and recovery of silver content in some real samples using flame atomic absorption spectroscopy as a confident reference.

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Section: Preparation Of Aunps and Sganmentioning

confidence: 92%

Section: Preparation Of Aunps and Sganmentioning

confidence: 99%

Section: General Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Silica gel/gold nanoparticles/(NS)2 ligand nanoporous platform-modified ionic liquid carbon paste electrode for potentiometric ultratrace assessment of Ag(I)

Ramezani

Mashhadizadeh

Ghobadi

et al. 2016

Int. J. Environ. Sci. Technol.

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Tellurite Carbon Paste Sensors: Microscopic Analysis Provides New Insights on the Nature of the Interaction Between the Ionophore and Analytical Species

et al. 2017

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In this work, scanning electron microscopy (SEM) was used for the characterization of chemically modified carbon paste sensors (CMCPSs), with the aim of understanding their chemical and electrochemical properties. The work also provides a microscopic study on the role of the binder, type of carbon, amount and nature of modifier, composition of the carbon paste and its impact on the electrochemical performance of the sensor. In addition, energy dispersive X‐ray spectroscopy (EDX) was utilized for the direct observation of the interaction between the chemical modifier and the carbon paste. This has enabled the fabrication of new sensitive and selective chemically modified carbon paste sensors that were successfully applied for the detection of tellurite ions in pure solutions, environmental and biological samples. This work provides new insights on the rational design and integration of carbon paste sensors for a variety of applications.

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Self‐assembly of p‐Aminothiophenol on Gold Surface: Application for Impedimetric and Potentiometric Sensing of Cobalt (II) Ions – A Comparative Study

Kaur

2019

Electroanalysis

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Cobalt, despite an essential biological element, imposes threat to humans when exposed to high concentration or even to low concentration for long term which demands the development of highly sensitive and selective analytical methods for its trace analysis. In the present work, self‐assembly of p‐aminothiophenol (p‐ATP) on gold surface (Au−ATP SAM) was carried out and for the first time, applied as a platform for impedimetric and potentiometric sensing of Co2+. Au−ATP SAM was characterized using electrochemical techniques: cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), in the presence of two redox probes: [Fe(CN)6]3−/4− and [Ru(NH3)6]2+/3+ to evaluate associated passivating behaviour. Au−ATP SAM completely blocked [Fe(CN)6]3−/4− as compared to [Ru(NH3)6]2+/3+ which may be attributed to inner‐sphere and outer‐sphere ET mechanisms, respectively. Au−ATP SAM was found to exhibit excellent sensitivity towards Co2+ in a wider concentration range from 1.0×10−12 M to 1.0×10−5 M (r2=0.963) at pH 5.5 with a detection limit of 6.0×10−13 M and superior selectivity. Further, carbon paste electrode (CPE) was prepared by incorporating p‐ATP bound gold nanoparticles and explored for potentiometric sensing of Co2+ which exhibited Nernstian slope of 29.2±0.2 mV/dec in linear concentration range of 1.0×10−6 M–1.0×10−1 M (r2=0.971) with a detection limit of 8.0×10−7 M. The proposed sensors were successfully applied for estimation of Co2+ content in water samples.

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Potentiometric determination of nanomolar concentration of Cu (II) using a carbon paste electrode modified by a self-assembled mercapto compound on gold nanoparticles

Cited by 29 publications

References 33 publications

Silica gel/gold nanoparticles/(NS)2 ligand nanoporous platform-modified ionic liquid carbon paste electrode for potentiometric ultratrace assessment of Ag(I)

Silica gel/gold nanoparticles/(NS)2 ligand nanoporous platform-modified ionic liquid carbon paste electrode for potentiometric ultratrace assessment of Ag(I)

Tellurite Carbon Paste Sensors: Microscopic Analysis Provides New Insights on the Nature of the Interaction Between the Ionophore and Analytical Species

Self‐assembly of p‐Aminothiophenol on Gold Surface: Application for Impedimetric and Potentiometric Sensing of Cobalt (II) Ions – A Comparative Study

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