Highly Porous Gold Electrodes – Preparation and Characterization

Othman, Ali; Bilan, Hubert K.; Katz, Evgeny; Smutok, Oleh

doi:10.1002/celc.202200099

Cited by 7 publications

(3 citation statements)

References 76 publications

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“…The processes of formation and dissolution of AuNPs in the positive potential region made it easier for the particles to agglomerate and arrange on top of each other, leading to larger particles. On the contrary, in the negative potential region, apart from the reduction of Au 3+ into Au 0 nanoparticles, there might be a formation of H 2 gas [51], leading to more numerous and smaller particles compared to the high potential region [57,58].…”

Section: Aucl 3ementioning

confidence: 99%

A fast fabrication technique of FTO/AuNPs electrochemical electrodes for on-site arsenic (III) detection

Nguyen,

Hoang Nguyen,

Nguyen

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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In this study, gold nanoelectrodes were fabricated via electrical deposition of gold nanoparticles (NPs) onto FTO electrodes using cyclic voltammetry (CV) in 1 M H3PO4 solution at a scan rate of 100 mV.s−1 in the potential range of 0–1.4 V and −0.5–0.6 V. The fabricated FTO/AuNP electrodes were characterised by UV–vis, scanning electron microscope, energy-dispersive X-ray spectroscopy, as well as CV and linear sweep voltammetry; the presence of gold on the electrode surface and its electrochemical properties were confirmed towards hydroquinone. The electrodes with the best electrochemical properties were chosen for arsenic(III) determination. The fabricated FTO/AuNP electrodes in the potential range of 0–1.4 V exhibited the high sensitivity with limit of detection (LOD) of 3.04 ppb and limit of quantitation (LOQ) of 9.23 ppb, whereas the FTO/AuNP electrode fabricated in the potential range of −0.5 V–0.6 V displayed the enhancement sensitivity with LOD = 0.623 ppb and LOQ = 1.89 ppb.

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Section: Aucl 3ementioning

confidence: 99%

A fast fabrication technique of FTO/AuNPs electrochemical electrodes for on-site arsenic (III) detection

Nguyen,

Hoang Nguyen,

Nguyen

et al. 2023

Adv. Nat. Sci: Nanosci. Nanotechnol.

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“…An enzyme-free glucose sensor utilizing Au nanoparticles was developed with significantly high surface roughness, which exhibited notable catalytic activity for the oxidation of glucose in a phosphate buffer (PBS) solution with a glucose sensitivity of 1.13 μA mM −1 cm −2 [ 11 ]. Furthermore, porous gold films directly electrodeposited onto gold electrodes have been reported, with a three-dimensional foam-like structure, a diverse range of pore sizes and a surface roughness that is nearly a thousand times greater than polished gold electrodes, leading to high current densities during the oxidation of glucose [ 12 , 13 ]. Du Toit et al have designed porous Au microelectrodes through electrodeposition using a hydrogen bubble template; the resulting porous Au microelectrodes demonstrated outstanding sensitivity to glucose, equal to 3.1 μA mM −1 cm −2 [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Soft-Template-Based Manufacturing of Gold Nanostructures for Energy and Sensing Applications

Kanti Maiti,

Liu,

Niyazi

et al. 2024

Biosensors

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Implantable and wearable bioelectronic systems can enable tailored therapies for the effective management of long-term diseases, thus minimising the risk of associated complications. In this context, glucose fuel cells hold great promise as in- or on-body energy harvesters for ultra-low-power bioelectronics and as self-powered glucose sensors. We report here the generation of gold nanostructures through a gold electrodeposition method in a soft template for the abiotic electrocatalysis of glucose in glucose fuel cells. Two different types of soft template were used: a lipid cubic phase-based soft template composed of Phytantriol and Brij®-56, and an emulsion-based soft template composed of hexane and sodium dodecyl sulphate (SDS). The resulting gold structures were first characterised by SAXS, SEM and TEM to elucidate their structure, and then their electrocatalytic activity towards glucose was compared in both a three-electrode set-up and in a fuel cell set-up. The Phytantriol/Brij®-56 template led to a nanofeather-like Au structure, while the hexane/SDS template led to a nanocoral-like Au structure. These templated electrodes exhibited similar electrochemical active surface areas (0.446 cm2 with a roughness factor (RF) of 14.2 for Phytantriol/Brij®-56 templated nanostructures and 0.421 cm2 with an RF of 13.4 for hexane/SDS templated nanostructures), and a sensitivity towards glucose of over 7 μA mM−1 cm−2. When tested as the anode of an abiotic glucose fuel cell (in a phosphate-buffered solution with a glucose concentration of 6 mM), a maximum power density of 7 μW cm−2 was reached; however the current density in the case of the fuel cell with the Phytantriol/Brij®-56 templated anode was approximately two times higher, reaching the value of 70 μA cm−2. Overall, this study demonstrates two simple, cost-effective and efficient strategies to manipulate the morphology of gold nanostructures, and thus their catalytic property, paving the way for the successful manufacturing of functional abiotic glucose fuel cells.

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“…Nanomaterials represented by NPG have been widely used as recognition elements of electrochemical sensors [28,29]. NPG possesses unique material properties that offer potential benefits for numerous applications, attributed to its high specific surface area, well-characterized gold mercaptan surface chemistry, high electrical conductivity, and reduced stiffness [30,31], which can significantly improve the sensitivity and signal-to-noise ratio of electrochemical sensors [32]. Owing to the exceptional biocompatibility and remarkable electrocatalytic properties exhibited by NPG for numerous compounds [33], this study meticulously opted for NPG as the modified material for the glass carbon electrode (GCE) to fabricate an NPG/GCE electrode (Figure 1A).…”

Section: Introductionmentioning

confidence: 99%

Integration of Glutamate Dehydrogenase and Nanoporous Gold for Electrochemical Detection of Glutamate

Cai,

Shang,

Wang

et al. 2023

Biosensors

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Glutamate, a non-essential amino acid produced by fermentation, plays a significant role in disease diagnosis and food safety. It is important to enable the real-time monitoring of glutamate concentration for human health and nutrition. Due to the challenges in directly performing electrochemical oxidation–reduction reactions of glutamate, this study leverages the synergistic effect of glutamate dehydrogenase (GLDH) and nanoporous gold (NPG) to achieve the indirect and accurate detection of glutamate within the range of 50 to 700 μM by measuring the generated quantity of NADH during the enzymatic reaction. The proposed biosensor demonstrates remarkable performance characteristics, including a detection sensitivity of 1.95 μA mM−1 and a limit of detection (LOD) of 6.82 μM. The anti-interference tests indicate an average recognition error ranging from −3.85% to +2.60%, spiked sample recovery rates between 95% and 105%, and a relative standard deviation (RSD) of less than 4.97% for three replicate experiments. Therefore, the GLDH-NPG/GCE biosensor presented in this work exhibits excellent accuracy and repeatability, providing a novel alternative for rapid glutamate detection. This research contributes significantly to enhancing the precise monitoring of glutamate concentration, thereby offering more effective guidance and control for human health and nutrition.

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Highly Porous Gold Electrodes – Preparation and Characterization

Cited by 7 publications

References 76 publications

A fast fabrication technique of FTO/AuNPs electrochemical electrodes for on-site arsenic (III) detection

A fast fabrication technique of FTO/AuNPs electrochemical electrodes for on-site arsenic (III) detection

Soft-Template-Based Manufacturing of Gold Nanostructures for Energy and Sensing Applications

Integration of Glutamate Dehydrogenase and Nanoporous Gold for Electrochemical Detection of Glutamate

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