Carbon‐Rich Monolayers on ITO as Highly Sensitive Platforms for Detecting Polycyclic Aromatic Hydrocarbons in Water: The Case of Pyrene

Muñoz, J.; Crivillers, Núria; Mas‐Torrent, Marta

doi:10.1002/chem.201703264

Cited by 13 publications

(15 citation statements)

References 32 publications

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“…Spontaneous formation of a dipole induces a polarity in the neighboring molecules. Increment of the non-polar molecule concentration in the system enhances the formation of instantaneous dipoles and hence the net effective dipole moment of the system increases [18]. Such increase of net dipole moment augments the system polarization, and hence the effective permittivity of the solution under investigation, which consequently raises the capacitance of the system.…”

Section: Variation Of Electrical and Optical Parameters With Relativementioning

confidence: 99%

“…Recently, a substantial amount 32 of research is focused on onsite quick detection of PAHs in water. Electrochemical techniques such as formulation of self-assembled monolayer for detection of pyrene [18], fabrication of cadmium/aluminum layered electrodes for detection of anthracene [19] as well as preparation of polymer based molecularly imprinted sensors coupled with fluorescence and mass-sensitive transducers for the detection of PAHs [20] have been carried out in recent past. However amongst all other techniques, impedance spectroscopy has flourished as a potential contender in analytical measurements since last decade [21] due to its rapid turn out, simplicity and cost-effectiveness.…”

Section: Introductionmentioning

confidence: 99%

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Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

Chattopadhyay¹,

Barman²,

Chakraborty³

et al. 2019

Br J Anal Chem

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Graphical AbstractSchematic representation of the system under investigation and variation of its electrical and optical properties with varying concentration of naphthalene.Polyaromatic hydrocarbons (PAH) are organic compounds with fused benzene rings that have toxic and mutagenic properties, and have been well documented for their detrimental effect on animal and plant health. Naphthalene, a two-ring PAH, is a common water pollutant which has been linked to the disruption of immune system as well as deformation of red blood corpuscles in human and thereby raising substantial concerns. The present study quantitatively estimates naphthalene in its aqueous solution by employing electrical impedance spectroscopy (EIS), which is simultaneously supported by UV-vis spectral analysis. Naphthalene solutions of varying concentrations (0.2-1 ppm) are prepared and subjected to EIS as well as UV-visible spectroscopy. For the EIS based studies, the data is recorded for the frequency range of 1 KHz -1 MHz and electrical parameters such as capacitance, conductance and admittance are observed to increase from 3.5 pF -7.2 pF, 2.3 µS -6.1 µS and 2.4 µS -27.3 µS, Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene Article 31 respectively, with varying naphthalene concentration in its solution. On the other hand impedance values are observed to decrease with the same. Naphthalene is itself a non-polar molecule and the formation of instantaneous dipoles originating from the interaction of such molecules governs the overall dielectric nature of the solution. UV-vis spectroscopic measurements of the solutions reveal the characteristic absorbance maxima at 216 nm for all the concentrations under investigation. Absorbance values are observed to increase with the relative strength of naphthalene in the solution and such values vary in the range of 0.02 -0.16 au for the peak obtained. Thus by corroborating the electrical and the optical parameters, this study establishes a quick and handy method for detection of naphthalene in aqueous solutions and ascertains a framework for further work that can be done to formulate a naphthalene sensing device. CONCLUSIONSElectrical parameters including the impedance, admittance, capacitance and conductance of naphthalene solution of varying strength are measured by employing impedance spectroscopy in this study. Formation of instantaneous dipoles in the system is observed to govern the effective dielectric behavior of the naphthalene solution. Spontaneous formation of a dipole induces a polarity in the neighboring non-polar constituent molecules. Increment of the non-polar molecule concentration in the system augments the formation of instantaneous dipoles and hence the effective dipole moment of the system increases. Coefficient of sensitivity in terms of impedance is also calculated for the measuring system, from which a decent change in impedance is observed for a variation of naphthalene concentration of a unit ppm. Spectrophotometric analyses of the solu...

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Section: Variation Of Electrical and Optical Parameters With Relativementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

Chattopadhyay¹,

Barman²,

Chakraborty³

et al. 2019

Br J Anal Chem

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show abstract

“…Scheme 1 summarizes the general procedure of the surface modification. The electrode preparation was aimed at the covalent grafting of CNTs on the ITO-based substrates via three functionalization steps, which were adapted from reference [16]:…”

Section: Electrode Preparationmentioning

confidence: 99%

“…Some electrochemical platforms, mainly based on voltammetric approaches, have shown to be a good alternative for the in situ PAH identification in aqueous samples [11][12][13][14][15]. Nonetheless, the use of electrochemical impedance spectroscopy (EIS) for PAHs determination is not often reported, except for a paper where a pyrene-based recognition platform is used for the selective sensing of pyrene [16].…”

Section: Introductionmentioning

confidence: 99%

Study of carbon nanotube-rich impedimetric recognition electrode for ultra-low determination of polycyclic aromatic hydrocarbons in water

et al. 2018

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Carbon nanotubes (CNTs) have been studied as an electrochemical recognition element for the impedimetric determination of priority polycyclic aromatic hydrocarbons (PAHs) in water, using hexocyanoferrate as a redox probe. For this goal, an indium tin oxide (ITO) electrode functionalized with a silane-based self-assembled monolayer carrying CNTs has been engineered. The electroanalytical method, which is similar to an antibody-antigen assay, is straightforward and exploits the high CNT-PAH affinity obtained via π-interactions. After optimizing the experimental conditions, the resulting CNT-based impedimetric recognition platform exhibits ultra-low detection limits (1.75 ± 0.04 ng·L) for the sum of PAHs tested, which was also validated by using a certified reference PAH mixture. Graphical abstract Schematic of an indium-tin-oxide (ITO) electrode functionalized with a silane-based self-assembled monolayer carrying carbon nanotubes (CNTs) as a recognition platform for the ultra-low determination of total polycyclic aromatic hydrocarbons (PAHs) in water via π-interactions using Electrochemical Impedance Spectroscopy (EIS).

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“…Recently, a substantial amount of research is focused on onsite quick detection of PAHs in water. Electrochemical techniques such as formulation of self-assembled monolayer for detection of pyrene [18], fabrication of cadmium/aluminum layered electrodes for detection of anthracene [19] as well as preparation of polymer based molecularly imprinted sensors coupled with fluorescence and mass-sensitive transducers for the detection of PAHs [20] have been carried out in recent past. However amongst all other techniques, impedance spectroscopy has flourished as a potential contender in analytical measurements since last decade [21] due to its rapid turn out, simplicity and cost-effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

Chattopadhyay¹,

Barman²,

Chakraborty³

et al. 2019

Br J Anal Chem

View full text Add to dashboard Cite

Schematic representation of the system under investigation and variation of its electrical and optical properties with varying concentration of naphthalene. Polyaromatic hydrocarbons (PAH) are organic compounds with fused benzene rings that have toxic and mutagenic properties, and have been well documented for their detrimental effect on animal and plant health. Naphthalene, a two-ring PAH, is a common water pollutant which has been linked to the disruption of immune system as well as deformation of red blood corpuscles in human and thereby raising substantial concerns. The present study quantitatively estimates naphthalene in its aqueous solution by employing electrical impedance spectroscopy (EIS), which is simultaneously supported by UV-vis spectral analysis. Naphthalene solutions of varying concentrations (0.2-1 ppm) are prepared and subjected to EIS as well as UV-visible spectroscopy. For the EIS based studies, the data is recorded for the frequency range of 1 KHz-1 MHz and electrical parameters such as capacitance, conductance and admittance are observed to increase from 3.5 pF-7.2 pF, 2.3 µS-6.1 µS and 2.4 µS-27.3 µS, Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene Article 31 respectively, with varying naphthalene concentration in its solution. On the other hand impedance values are observed to decrease with the same. Naphthalene is itself a non-polar molecule and the formation of instantaneous dipoles originating from the interaction of such molecules governs the overall dielectric nature of the solution. UV-vis spectroscopic measurements of the solutions reveal the characteristic absorbance maxima at 216 nm for all the concentrations under investigation. Absorbance values are observed to increase with the relative strength of naphthalene in the solution and such values vary in the range of 0.02-0.16 au for the peak obtained. Thus by corroborating the electrical and the optical parameters, this study establishes a quick and handy method for detection of naphthalene in aqueous solutions and ascertains a framework for further work that can be done to formulate a naphthalene sensing device.

show abstract

Carbon‐Rich Monolayers on ITO as Highly Sensitive Platforms for Detecting Polycyclic Aromatic Hydrocarbons in Water: The Case of Pyrene

Cited by 13 publications

References 32 publications

Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

Study of carbon nanotube-rich impedimetric recognition electrode for ultra-low determination of polycyclic aromatic hydrocarbons in water

Optical Analysis Authenticated Electrical Impedance Based Quantification of Aqueous Naphthalene

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