Gold‐dendrimer Nanocomposite Based Electrochemical Sensor for Dopamine

Sipuka, Dimpo S.; Arotiba, Omotayo A.; Sebokolodi, Tsholofelo I.; Tsekeli, Tebogo R.; Nkosi, Duduzile

doi:10.1002/elan.202200099

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…The AuNP modification process was easily promoted by a few potential cycles. The characterization showed both uniform distribu- TBABr/SDS•AuNPs/GO/GCE 0.02-1.0 0.01 [58] GCE-PPI-AuNPs 0.1-125 0.16 [59] AuNPs/1T-MoS 2 /GCE 0.2-80 0.16 [60] GCE/rGO−Zn(II)TPEBiPc 0.05-0.8 0.0016 [61] GCE-ERGO/polyCoTAPc 2.0-100 0.095 [62] Au-IPA-AmGQD-CoTCPhOPc 1.0-50 0.20 [63] CoTGPc/GCE 2-12 1.0 [64] The decrease in the sensitivity to DA concentration higher than 10 µmol/L can be ascribed to kinetic limitation, being related to irreversible adsorption of the DA molecules at electrode surface [65,66]. Indeed, the SPCE/p-NiTsPc/AuNP even in a solution in the absence of DA also showed DA peak oxidation (Figure S7) and the SERRS spectra also showed the DA vibration at 1483 cm −1 .…”

Section: Discussionmentioning

confidence: 99%

Nickel Tetrasulfonated Phthalocyanine Decorated with AuNP as a Double Sensorial Platform: SERS and Electrochemical

et al. 2023

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The development of materials for multiple applications is a challenge in the fields of technology and materials science. In this work, screen-printed carbon electrodes (SPCEs) were modified with an electropolymerized nickel tetrasulfonated phthalocyanine film (polymeric-NiTsPc = p-NiTsPc) decorated with gold nanoparticles (AuNP). The modified SPCEs were applied as a sensing platform for analysis via electrochemical and surface-enhanced Raman scattering (SERS) spectroscopy. The SPCEs modification was based on the potential cycling firstly in a NiTsPc solution and then in an AuHCl4 solution, with the fast formation of spherical AuNP through the p-NiTsPc film surface. The modified electrode based on SPCE/p-NiTsPc/AuNP showed a synergetic effect in voltammetric measurements in [Fe(CN)6]3−/[Fe(CN)6]4− probe as well as an electrocatalytic effect in the presence of dopamine. The calibration curve towards dopamine detection presented a linear range from 1 to 10 μmol/L with a limit of detection of 0.73 μmol/L. The spectroelectrochemistry measurements combining SERS and the applied potential of −60 mV showed that the SPCE/p-NiTsPc/AuNP and SPCE/AuNP can be powerfully used as a dual sensing platform for dopamine detection. In the case of SPCE/p-NiTsPc/AuNP, p-NiTsPc plays an important role in facilitating electron transfer during the electrochemical reaction, while AuNP is crucial for obtaining SERS signals for dopamine detection.

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Section: Discussionmentioning

confidence: 99%

Nickel Tetrasulfonated Phthalocyanine Decorated with AuNP as a Double Sensorial Platform: SERS and Electrochemical

et al. 2023

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“…In addition to these methods, current pulse-based methods have been also employed in the development of electrochemical sensors. Compared to chemical preparation procedures for metal nanoparticle-based composite materials [ 15 , 16 ], the electrochemical ones provide better control of the thickness of the polymeric matrix and the size of the metal nanoparticles [ 17 , 18 , 19 ]. Recently, we have developed novel preparation procedures based on the use of sinusoidal voltages for the electrodeposition of conducting polymers and metal nanoparticles composite materials [ 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Sensing Platform Based on Metal Nanoparticles for Epinephrine and Serotonin

Leau,

Lete,

Matei

et al. 2023

Biosensors

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A sensing platform based on nanocomposite materials composed of gold metal nanoparticles (AuNPs) and conducting polymer (CP) matrix has been developed for serotonin and epinephrine detection. The CP-AuNPs nanocomposite materials have been synthesized onto glassy carbon electrodes (GCE) by using novel electrochemical procedures based on sinusoidal currents (SC). The SC procedures ensured good control of the metal nanoparticles distribution, increased electrochemical surface area, and enhanced analytical performance. The proposed sensing platform displayed good analytical performance toward serotonin and epinephrine detection. A wide linear analytical response toward epinephrine in the range from 10 to 640 μM and a low detection limit of 1.4 μM epinephrine has been obtained. The sensing platform has also displayed a linear response toward serotonin in the range from 10 to 320 μM, with a detection limit of 5.7 μM serotonin. The sensing platform has been successfully applied in the analysis of epinephrine and serotonin in real samples of tap water and urine with good accuracy.

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Electrochemical detection of dopamine by pineapple leaf‐derived porous carbon modified electrode

Liu,

et al. 2024

Electroanalysis

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Gold‐dendrimer Nanocomposite Based Electrochemical Sensor for Dopamine

Cited by 8 publications

References 45 publications

Nickel Tetrasulfonated Phthalocyanine Decorated with AuNP as a Double Sensorial Platform: SERS and Electrochemical

Nickel Tetrasulfonated Phthalocyanine Decorated with AuNP as a Double Sensorial Platform: SERS and Electrochemical

Electrochemical Sensing Platform Based on Metal Nanoparticles for Epinephrine and Serotonin

Electrochemical detection of dopamine by pineapple leaf‐derived porous carbon modified electrode

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