Fabrication of nanoporous Au films with ultra-high surface area for sensitive electrochemical detection of glucose in the presence of Cl−

Jeong, Hwakyeung; Kim, Jongwon

doi:10.1016/j.apsusc.2014.01.082

Cited by 22 publications

(23 citation statements)

References 18 publications

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“…The oxide formation on the surface of the electrode was evident by orange-yellowish coloration, which after the electrochemical reduction changed to black confirming the formation of np-Au film. Similarly, scanning and holding the potential at 1.8 V (vs. Hg/Hg 2 SO 4 ) in oxalic acid for 90 min [ 34 ] and at 4.0 V in citric acid for 3 h [ 35 ] can deposit a carbonaceous passivation film on the surface of Au electrode. Removal of this film on the reverse scan can create a np-Au film with uniform pores and ultra-high surface area, with a roughness factor as high as 1000.…”

Section: Preparation Of Np-au Using Electrochemical Techniquesmentioning

confidence: 99%

“…Figure 5 A is a comparison between cyclic voltammograms of flat gold wire (black) and np-Au wire (red), clearly showing a substantially higher surface area of np-Au wire. The roughness factor (Rf) of the np-Au against the planar surface can be obtained by dividing the microscopic surface area by the geometric surface area, which can range from tens to thousands depending on preparation methods, amount of material, and the size of the pores [ 32 , 35 ].…”

Section: Electrochemical Characterization Of Np-aumentioning

confidence: 99%

“…The presence of chloride ions in the electrolyte solution was found to only interfere with the signal at −1.0 V, but the oxidation peak at 0.2 V is not much affected [ 117 ]. In fact, the sensitivity of np-Au having very high surface area (Rf around 1000) can be greatly enhanced by the addition of chloride ions [ 35 ]. It is believed that the fast-moving chloride ions may help the slow glucose oxidation reaction to utilize the entire np-Au surface, which otherwise would not have been possible.…”

Section: Electrochemical Biosensingmentioning

confidence: 99%

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Preparation, Modification, Characterization, and Biosensing Application of Nanoporous Gold Using Electrochemical Techniques

et al. 2018

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Nanoporous gold (np-Au), because of its high surface area-to-volume ratio, excellent conductivity, chemical inertness, physical stability, biocompatibility, easily tunable pores, and plasmonic properties, has attracted much interested in the field of nanotechnology. It has promising applications in the fields of catalysis, bio/chemical sensing, drug delivery, biomolecules separation and purification, fuel cell development, surface-chemistry-driven actuation, and supercapacitor design. Many chemical and electrochemical procedures are known for the preparation of np-Au. Recently, researchers are focusing on easier and controlled ways to tune the pores and ligaments size of np-Au for its use in different applications. Electrochemical methods have good control over fine-tuning pore and ligament sizes. The np-Au electrodes that are prepared using electrochemical techniques are robust and are easier to handle for their use in electrochemical biosensing. Here, we review different electrochemical strategies for the preparation, post-modification, and characterization of np-Au along with the synergistic use of both electrochemistry and np-Au for applications in biosensing.

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Section: Preparation Of Np-au Using Electrochemical Techniquesmentioning

confidence: 99%

Section: Electrochemical Characterization Of Np-aumentioning

confidence: 99%

Section: Electrochemical Biosensingmentioning

confidence: 99%

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Preparation, Modification, Characterization, and Biosensing Application of Nanoporous Gold Using Electrochemical Techniques

et al. 2018

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“…It has been found that the roughness factor, the ratio of the electrochemical active surface area to the geometric area, of np-Au depends on potential step time, which can be enhanced when hydroxylamine hydrochloride (NH 2 OH•HCl) solution is mixed with NH 4 Cl to prevent bubble formation during the np-Au formation step. Non-chloride-containing electrolytes like citric acid have also been used to prepare np-Au on gold rod by providing the anodic potential of 4.0 V for 3 h to create the ultra-high surface area with the roughness factor higher than 1000 [38].…”

Section: Electrochemical Etching Of Gold Electrodementioning

confidence: 99%

Structure and Applications of Gold in Nanoporous Form

Bhattarai¹,

Neupane²,

Nepal³

et al. 2018

Noble and Precious Metals - Properties, Nanoscale Effects and Applications

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Nanoporous gold (np-Au) has many interesting and useful properties that make it a material of interest for use in many technological applications. Its biocompatible nature and ability to serve as a support for self-assembled monolayers of alkanethiols and their derivative make it a suitable support for the immobilization of carbohydrates, enzymes, proteins, and DNA. Its chemically inert, physically robust and conductive high-surface area makes it useful for the design of electrochemistry-based chemical/bio-sensors and reactors. Furthermore, it is also used as solid support for organic molecular synthesis and biomolecules separation. Its enhanced optical property has application in design of plasmonics-based sensitive biosensors. In fact, np-Au is one of the few materials that can be used as a transducer for both optical and electrochemical biosensing. Due to the presence of low-coordination surface sites, np-Au shows remarkable catalytic activity for oxidation of molecules like carbon monoxide and methanol. Owing to the importance of np-Au, in this chapter we will highlight different strategies of fabrication of np-Au and its emerging applications based on its unique properties.

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“…In recent years, nanoporous gold (NPG) has attracted considerable interest, fueled by its potential application in various fields, such as sensors [1,2], actuators [3], catalysts [4,5], and supercapacitors [6]. All these remarkable properties of NPG originate from a special sponge-like structure, characterized by bicontinuous pores and ligaments both in nanoscales.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing atmosphere on the thermal coarsening of nanoporous gold films

Chen

Shi

Liu

et al. 2015

Applied Surface Science

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Fabrication of nanoporous Au films with ultra-high surface area for sensitive electrochemical detection of glucose in the presence of Cl−

Cited by 22 publications

References 18 publications

Preparation, Modification, Characterization, and Biosensing Application of Nanoporous Gold Using Electrochemical Techniques

Preparation, Modification, Characterization, and Biosensing Application of Nanoporous Gold Using Electrochemical Techniques

Structure and Applications of Gold in Nanoporous Form

Effect of annealing atmosphere on the thermal coarsening of nanoporous gold films

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