Quaternary phosphonium-based (TPQPCl)-ionomer/graphite nanoplatelets composite chemically modified electrodes: a novel platform for sensing applications

Hernandez-Aldave, Sandra; Kaspar, Robert; Letterio, Michael P.; Tarat, Afshin; Yan, Yushan; Bertoncello, Paolo

doi:10.1039/c8tc04967j

Cited by 10 publications

(5 citation statements)

References 66 publications

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“…This also contributes to avoiding the potential interference from water oxidation that may occur at such potential. This effect has already been described by Zanardi et al [ 55 ] and confirmed in one of our previous works [ 56 ].…”

Section: Resultssupporting

confidence: 90%

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

et al. 2019

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We report for the first time a procedure in which Nafion/Graphite nanoplatelets (GNPs) thin films are fabricated using a modified layer-by-layer (LbL) method. The method consists of dipping a substrate (quartz and/or glassy carbon electrodes) into a composite solution made of Nafion and GNPs dissolved together in ethanol, followed by washing steps in water. This procedure allowed the fabrication of multilayer films of (Nafion/GNPs)n by means of hydrogen bonding and hydrophobic‒hydrophobic interactions between Nafion, GNPs, and the corresponding solid substrate. The average thickness of each layer evaluated using profilometer corresponds to ca. 50 nm. The as-prepared Nafion/GNPs LbL films were characterized using various spectroscopic techniques such as X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), FTIR, and optical microscopy. This characterization highlights the presence of oxygen functionalities that support a mechanism of self-assembly via hydrogen bonding interactions, along with hydrophobic interactions between the carbon groups of GNPs and the Teflon-like (carbon‒fluorine backbone) of Nafion. We showed that Nafion/GNPs LbL films can be deposited onto glassy carbon electrodes and utilized for the voltammetric detection of caffeine in beverages. The results showed that Nafion/GNPs LbL films can achieve a limit of detection for caffeine (LoD) of 0.032 μM and linear range between 20‒250 μM using differential pulse voltammetry, whereas, using cyclic voltammetry LoD and linear range were found to be 24 μM and 50‒5000 μM, respectively. Voltammetric detection of caffeine in beverages showed good agreement between the values found experimentally and those reported by the beverage producers. The values found are also in agreement with those obtained using a standard spectrophotometric method. The proposed method is appealing because it allows the fabrication of Nafion/GNPs thin films in a simple fashion using a single-step procedure, rather than using composite solutions with opposite electrostatic charge, and also allows the detection of caffeine in beverages without any pre-treatment or dilution of the real samples. The proposed method is characterized by a fast response time without apparent interference, and the results were competitive with those obtained with other materials reported in the literature.

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Section: Resultssupporting

confidence: 90%

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

et al. 2019

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“…Few of the free solvent molecules in the framework, which are hard to accurately ascertain according to the serious disordered structures, were squeezed by the PLATON program. Cd−O bond lengths are from 2.298 to2.304 Å, and the average bond distance of Cd−N is 2.325 Å; the O−Cd−O and O−Cd−N angles range from 54.91°(8) to 148.23°(8) and 83.97°(9) to 92.37° (9), respectively. The detailed bond lengths of Cd−O and average bond distance between Cd 2+ and adjacent atoms are listed in Table S2 of Supporting Information.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As an essential basic vitamin for human and animals, ascorbic acid (AA, vitamin C) is famous as a vital antioxidant. − It is not only an important medication for wound healing, scurvy, and hypohemia but is also an indispensable cofactor for several enzymes, which are of the metabolism for folic acid, tyrosine, and tryptophan . Otherwise, the lack of ascorbic acid leads to hypo-immunity, cancer, and infertility, , while the overdose will cause kidney calculi, stomach cramps, and diarrhea . Considering the importance of AA, quantitative analysis of AA is capturing great attention in the clinical, pharmaceutical, and food industries.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Luminescence-Silent System Based on a Post-Synthetic Modification Cd-MOFs: A Highly Selective and Sensitive Turn-on Luminescent Probe for Ascorbic Acid Detection

et al. 2019

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A unique three-dimensional luminescent metal–organic framework (Cd-MOFs), [Cd(tpbpc)2]·2H2O·DMF (Htpbpc = 4′-[4,2′;6′,4″]-terpyridin-4′-yl-biphenyl-4-carboxylic acid; DMF = dimethylformamide), was synthesized and structurally characterized; it exhibits excellent luminescent property and structural stability in aqueous solutions. Interestingly, an unparalleled luminescence-silent system CrO4 2–@Cd-MOFs was successfully fabricated by postsynthetic modification of metal–organic frameworks. This luminescence-silent system represents a highly selective and sensitive turn-on luminescent responding to ascorbic acid. First, this advanced fluorescent sensor displays excellent performance for CrO4 2– ions with a quenching of fluorescence intensity originating from fluorescence resonance energy transfer (FRET) mechanism. What’s more, the fluorescent intensity of CrO4 2–@Cd-MOFs system can be recovered (turn-on) for sensing ascorbic acid because of the elimination of FRET process. Such a novel fabrication strategy should offer the guidance to develop various MOFs-implicated luminescence-silent systems as “turn-on” sensors for detection of specific chemicals.

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“…4 The abnormal level of AA in the human body may result in diseases such as scurvy, infertility, diarrhea, stomach cramps, kidney calculi and cancer. 5,6 Additionally, the content of AA in the body is closely related to AAO. Therefore, it is highly desirable to fabricate highly sensitive strategies for AA and AAO detection.…”

Section: Introductionmentioning

confidence: 99%

A facile fluorescence Eu MOF sensor for ascorbic acid and ascorbate oxidase detection

Dong,

Chen,

Kong

et al. 2024

Anal. Methods

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Quaternary phosphonium-based (TPQPCl)-ionomer/graphite nanoplatelets composite chemically modified electrodes: a novel platform for sensing applications

Abstract: Ionomer (TPQPCl)/graphite nanoplatelet-coated electrodes are developed as a new sensing platform for amperometric detection of ascorbic acid.

Cited by 10 publications

References 66 publications

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

Fabrication of a Luminescence-Silent System Based on a Post-Synthetic Modification Cd-MOFs: A Highly Selective and Sensitive Turn-on Luminescent Probe for Ascorbic Acid Detection

A facile fluorescence Eu MOF sensor for ascorbic acid and ascorbate oxidase detection

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