Electrochemical Oxidation and Determination of Glucose in Alkaline Media Based on Au (111)-Like Nanoparticle Array on Indium Tin Oxide Electrode

Wang, Jungang; Cao, Xiaowei; Wang, Xin; Yang, Sen; Wang, Rong

doi:10.1016/j.electacta.2014.06.116

Cited by 56 publications

(51 citation statements)

References 64 publications

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“…Additionally, for electrodes with 10 nm‐thick Au layer and nanoparticles obtained from these layer, a clear glucose oxidation peak at +0.3 V vs . Ag/AgCl/0.1 M KCl corresponding to the second stage of catalytic oxidation of glucose can be seen, in contrast to samples with 5 nm film/Au nanoparticles received from 5 nm film. Moreover, in the case of dewetted 10 nm‐thick Au film, slightly higher density is registered and oxidation peak is shifted to the lower potential value (from +0.3 V to +0.2 V vs .…”

Section: Resultsmentioning

confidence: 99%

“…It can be easily observed that electrodes that underwent thermal treatment exhibit larger amperometric response than the ones with untreated gold layers. Additionally, for electrodes with 10 nm-thick Au layer and nanoparticles obtained from these layer, a clear glucose oxidation peak at + 0.3 V vs. Ag/AgCl/0.1 M KCl corresponding to the second stage of catalytic oxidation of glucose [34] can be seen, in contrast to samples with 5 nm film/Au nanoparticles received from 5 nm film. Moreover, in the case of dewetted 10 nm-thick Au film, slightly higher density is .…”

Section: Best Materials Selectionmentioning

confidence: 91%

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A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

et al. 2019

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The detection of glucose at low concentrations using electrochemical sensors is of great importance due to the possibility of using different human body fluids than blood, such as e. g. urine, saliva, sweat or tears. The interest behind those biofluids is related to their utility in non‐invasive sugar determination. In this work, we present flexible, fully biocompatible electrode material based on Au nanoparticles immobilized onto titanium dimples. Au−Ti heterostructures were obtained via electrochemical anodization of titanium foil in presence of fluoride anions followed by chemical etching, magnetron sputtering of gold and subsequent thermal dewetting in continuous regime. In the last step of fabrication, electrodes were modified by permselective Nafion membrane. The selection of the best electrode material among different configurations was carried out basing on the electrochemical activity in the contact with 5 mM glucose dissolved in neutral air‐saturated 0.1 M PBS. For the 10 nm Au dewetted gold film, limit of detection of 30 μM and high sensitivity of 93 mA cm−2 mM−1 were achieved. Application of Nafion membrane caused complete inhibition of the impact of various interference species onto the glucose detection. Good selectivity and repeatability combined with the resistance to prolonged mechanical stress suggest that prepared material can be used in non‐invasive glucose sensing.

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Section: Resultsmentioning

confidence: 99%

Section: Best Materials Selectionmentioning

confidence: 91%

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

et al. 2019

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“…The PMGFs show a linear response over 200 × 10 −9 to 1 × 10 −6 m with a correlation coefficient 0.988 and the limit of detection (LoD) was estimated to be 450 × 10 −9 m (Figure h), which is almost ten times higher than NMGFs (4.12 × 10 −6 m ) . Such a detection at a nanomolar level has never been reported, although different Au structures such as Au nanoparticles (500 × 10 −6 m ), inverse‐opal Au film (3.2 × 10 −6 m ), polymer stabilized Au (61 × 10 −6 m ), and nanowires (50 × 10 −6 m ) have also been tested . We believe that this higher electrocatalytic activity is not limited to glucose and could be employed to design ultrasensitive detection of other clinically relevant disease‐specific molecules.…”

Section: Resultsmentioning

confidence: 92%

Designed Patterning of Mesoporous Metal Films Based on Electrochemical Micelle Assembly Combined with Lithographical Techniques

Lim

Kim

Kani

et al. 2019

Small

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Mesoporous noble metals and their patterning techniques for obtaining unique patterned structures are highly attractive for electrocatalysis, photocatalysis, and optoelectronics device applications owing to their expedient properties such as high level of exposed active locations, cascade electrocatalytic sites, and large surface area. However, patterning techniques for mesoporous substrates are still limited to metal oxide and silica films, although there is growing demand for developing techniques related to patterning mesoporous metals. In this study, the first demonstration of mesoporous metal films on patterned gold (Au) substrates, prefabricated using photolithographic techniques, is reported. First, different growth rates of mesoporous Au metal films on patterned Au substrates are demonstrated by varying deposition times and voltages. In addition, mesoporous Au films are also fabricated on various patterns of Au substrates including stripe and mesh lines. An alternative fabrication method using a photoresist insulating mask also yields growth of mesoporous Au within the patterning. Moreover, patterned mesoporous films of palladium (Pd) and palladium–copper alloy (PdCu) are demonstrated on the same types of substrates to show versatility of this method. Patterned mesoporous Au films (PMGFs) show higher electrochemically active surface area (ECSA) and higher sensitivity toward glucose oxidation than nonpatterned mesoporous Au films (NMGF).

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“…20 The surface area of the AuNPs/GCE was larger than that of pure Au electrode by integrating the reduction charge of gold oxide monolayer. 21 It indicated that there was nanostructured gold on the electrode and the proposed method could be used for in situ synthesis of AuNPs on the electrode.…”

Section: Resultsmentioning

confidence: 99%

In Situ Synthesis of Gold Nanoparticles on Poly (L-arginine) Modified Glassy Carbon Electrode and Electrocatalytic Oxidation of Glucose in Alkaline Solution

Zhou¹,

Wei²,

Zhuang³

et al. 2015

ECS Electrochemistry Letters

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In situ synthesis of gold nanoparticles on poly (L-arginine) modified glassy carbon electrode using poly (L-arginine) as reduction agent is reported. EDAX pattern suggests that the gold nanoparticles can be in situ synthesized on poly (L-arginine) modified glassy carbon electrode. SEM image shows that the gold nanoparticles are well dispersed on the surface of glassy carbon electrode. The as-synthesized gold nanoparticles show excellent electrocatalytic activity for the oxidation of glucose. This strategy provides an in situ approach to prepare gold nanoparticles modified electrode using poly (amino acid) as reduction agent for sensor and catalytic applications.The synthesis of gold nanoparticles (AuNPs) has received considerable attention due to its optical, electronic and catalytic properties. 1,2 The modification of AuNPs on the electrode can bring high active electrode surface area and good conductivity, which enable a wide range of potential applications including fuel cells, 3 and electrochemical sensors such as non-enzymatic glucose sensors 4-6 and enzymatic glucose biosensors. 7-9 Now, there are a number of synthesis methods for obtaining AuNPs such as electrochemical, photoirradiation, ultrasonic irradiation and seed mediated growth processes. 10 These methods can be divided into two categories depending on whether the nanoparticles are grown in a non-polar organic medium or a polar medium such as water. 11 The synthesis of AuNPs in a non-polar medium is generally prepared via reduction of HAuCl 4 by NaBH 4 or citrate in the presence of a stabilizer containing at least one -NH 2 or -SH group. 12 On the other hand, water-soluble AuNPs have long been synthesized by reduction of HAuCl 4 using citrate in aqueous solution. 13 Recently, the water-dispersible AuNPs were synthesized by reduction of HAuCl 4 using amino acids in aqueous solution. Selvakannan et al. reported that the water-dispersible AuNPs prepared by the spontaneous reduction of aqueous chloroaurate ions using tryptophan. 14 Wangoo et al. demonstrated that synthesis of a stable gold hydrosol by using glutamic acid as reduction agent. 12 The other amino acids, such as L-arginine, L-lysine, L-aspartic acid and L-tyrosine, were also used as reduction agent to synthesis of water-dispersible AuNPs. 11,15 L-arginine is a well-known amino acid, which can be easily electropolymerized on electrode surface to form a poly (L-arginine) (PLA) film. 16,17 PLA polymer cannot only bear amino groups but also provide the matrix bridges. 18,19 In this study, we report an in situ synthesis of AuNPs on PLA modified glassy carbon electrode (GCE) using PLA as reduction agent. The AuNPs on the modified electrode were characterized by EDAX and SEM. The electrocatalytic activity of the synthesized AuNPs for glucose oxidation in alkaline solution was also evaluated. ExperimentalReagents.-All the reagents were bought from local commercial sources with analytical grade. 0.2 M Na 2 HPO 4 and 0.2 M NaH 2 PO 4 solutions were mixed to form a phosphate (PP) buffer solution (0.2 M...

show abstract

Electrochemical Oxidation and Determination of Glucose in Alkaline Media Based on Au (111)-Like Nanoparticle Array on Indium Tin Oxide Electrode

Cited by 56 publications

References 64 publications

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

A Flexible Nafion Coated Enzyme‐free Glucose Sensor Based on Au‐dimpled Ti Structures

Designed Patterning of Mesoporous Metal Films Based on Electrochemical Micelle Assembly Combined with Lithographical Techniques

In Situ Synthesis of Gold Nanoparticles on Poly (L-arginine) Modified Glassy Carbon Electrode and Electrocatalytic Oxidation of Glucose in Alkaline Solution

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