A new organic redox species-indole tetraone trapped MWCNT modified electrode prepared by in-situ electrochemical oxidation of indole for a bifunctional electrocatalysis and simultaneous flow injection electroanalysis of hydrazine and hydrogen peroxide

Mayuri, Pinapeddavari; Huang, Sheng‐Tung; Mani, Veerappan; Kumar, Amit

doi:10.1016/j.electacta.2018.02.107

Cited by 22 publications

(12 citation statements)

References 34 publications

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“…Based on the results, it is proposed that the Car-HQ get strongly adsorbed on the graphitic structure of MWCNT via π–π interaction and fraction of C–C bond formation. It is believed that the attachment of N-benzyl-indole moiety of Car-HQ strongly supports the improved π–π tethering on the graphite structure 37 . For control experiments (Fig.…”

Section: Resultsmentioning

confidence: 91%

A prototype device of microliter volume voltammetric pH sensor based on carbazole–quinone redox-probe tethered MWCNT modified three-in-one screen-printed electrode

Srinivas

Ashokkumar

Kamaraj

et al. 2021

Sci Rep

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As an alternate for the conventional glass-based pH sensor which is associated with problems like fragile nature, alkaline error, and potential drift, the development of a new redox-sensitive pH probe-modified electrode that could show potential, current-drift and surface-fouling free voltammetric pH sensing is a demanding research interest, recently. Herein, we report a substituted carbazole-quinone (Car-HQ) based new redox-active pH-sensitive probe that contains benzyl and bromo-substituents, immobilized multiwalled carbon nanotube modified glassy carbon (GCE/MWCNT@Car-HQ) and screen-printed three-in-one (SPE/MWCNT@Car-HQ) electrodes for selective, surface-fouling free pH sensor application. This new system showed a well-defined surface-confined redox peak at an apparent standard electrode potential, Eo′ = − 0.160 V versus Ag/AgCl with surface-excess value, Γ = 47 n mol cm−2 in pH 7 phosphate buffer solution. When tested with various electroactive chemicals and biochemicals such as cysteine, hydrazine, NADH, uric acid, and ascorbic acid, MWCNT@Car-HQ showed an unaltered redox-peak potential and current values without mediated oxidation/reduction behavior unlike the conventional hydroquinone, anthraquinone and other redox mediators based voltammetry sensors with serious electrocatalytic effects and in turn potential and current drifts. A strong π–π interaction, nitrogen-atom assisted surface orientation and C–C bond formation on the graphitic structure of MWCNT are the plausible reasons for stable and selective voltammetric pH sensing application of MWCNT@Car-HQ system. Using a programed/in-built three-in-one screen printed compatible potentiostat system, voltammetric pH sensing of 3 μL sample of urine, saliva, and orange juice samples with pH values comparable to that of milliliter volume-based pH-glass electrode measurements has been demonstrated.

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Section: Resultsmentioning

confidence: 91%

A prototype device of microliter volume voltammetric pH sensor based on carbazole–quinone redox-probe tethered MWCNT modified three-in-one screen-printed electrode

Srinivas

Ashokkumar

Kamaraj

et al. 2021

Sci Rep

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“…The composite electrode exhibited a pore structure with large surface areas and excellent biocompatibility. In addition, the chains of PIT@Fe3O4 nanocomposite present an appropriate matrix for immobilization of hemoglobin resulting in direct electrocatalytic performances of hemoglobin with a low detection limit of 0.54 μM and a linear range up to 350 µM 302 . Please do not adjust margins Please do not adjust margins 5.2.2.4.…”

Section: Volatile Organic Compounds (Voc)mentioning

confidence: 99%

“…In addition, the chains of the PIT@Fe 3 O 4 nanocomposite present an appropriate matrix for the immobilization of hemoglobin, resulting in direct electrocatalytic performances of hemoglobin with a low detection limit of 0.54 mM and a linear range up to 350 mM. 302 5.2.2.4. Humidity.…”

Section: H 2 Omentioning

confidence: 99%

Polyindole and polypyrrole as a sustainable platform for environmental remediation and sensor applications

et al. 2022

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“…Nowadays, various conventional methods have been applied for accurate hydrazine determination, such as spectrophotometry [6], chromatography [7], colorimetry [8], flow injection analysis [9] and electrochemistry [10]. Among them, the electroanalytical method possesses many advantages, including high sensitivity, low cost, fast response and simplicity of operation for hydrazine determination.…”

Section: Introductionmentioning

confidence: 99%

Constructing and electrochemical performance of AuNPs decorated MIL-53 (Fe, Ni) MOFs–derived nanostructures for highly sensitive hydrazine detection

Wang

Zhao

Qian

et al. 2022

Applied Surface Science

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A new organic redox species-indole tetraone trapped MWCNT modified electrode prepared by in-situ electrochemical oxidation of indole for a bifunctional electrocatalysis and simultaneous flow injection electroanalysis of hydrazine and hydrogen peroxide

Cited by 22 publications

References 34 publications

A prototype device of microliter volume voltammetric pH sensor based on carbazole–quinone redox-probe tethered MWCNT modified three-in-one screen-printed electrode

A prototype device of microliter volume voltammetric pH sensor based on carbazole–quinone redox-probe tethered MWCNT modified three-in-one screen-printed electrode

Polyindole and polypyrrole as a sustainable platform for environmental remediation and sensor applications

Constructing and electrochemical performance of AuNPs decorated MIL-53 (Fe, Ni) MOFs–derived nanostructures for highly sensitive hydrazine detection

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