Ordered arrays of nanoporous gold nanoparticles

Wang, Dong; Ji, Ran; Albrecht, Arne; Schaaf, Peter

doi:10.3762/bjnano.3.74

Cited by 57 publications

(58 citation statements)

References 24 publications

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“…The increased surface area of NPG can be used to enhance the sensitivity of assays by increasing enzyme loading and amplifying analytical signals [70, 71]. The development of NPG in array formats has recently been reported [72–74], and this strengthens the prospects for application of NPG in screening technologies. A general review of the analytical applications of NPG has recently appeared [75].…”

Section: Introductionmentioning

confidence: 99%

Square-wave voltammetry assays for glycoproteins on nanoporous gold

Pandey

Bhattarai

Pornsuriyasak

et al. 2014

Journal of Electroanalytical Chemistry

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Electrochemical enzyme-linked lectinsorbent assays (ELLA) were developed using nanoporous gold (NPG) as a solid support for protein immobilization and as an electrode for the electrochemical determination of the product of the reaction between alkaline phosphatase (ALP) and p-aminophenyl phosphate (p-APP), which is p-aminophenol (p-AP). Glycoproteins or concanavalin A (Con A) and ALP conjugates were covalently immobilized onto lipoic acid self-assembled monolayers on NPG. The binding of Con A – ALP (or soybean agglutinin – ALP) conjugate to glycoproteins covalently immobilized on NPG and subsequent incubation with p-APP substrate was found to result in square-wave voltammograms whose peak difference current varied with the identity of the glycoprotein. NPG presenting covalently bound glycoproteins was used as the basis for a competitive electrochemical assay for glycoproteins in solution (transferrin and IgG). A kinetic ELLA based on steric hindrance of the enzyme-substrate reaction and hence reduced enzymatic reaction rate after glycoprotein binding is demonstrated using immobilized Con A–ALP conjugates. Using the immobilized Con A-ALP conjugate, the binding affinity of immunoglobulin G (IgG) was found to be 105 nM, and that for transferrin was found to be 650 nM. Minimal interference was observed in the presence of 5 mg mL−1 BSA as a model serum protein in both the kinetic and competitive ELLA. Inhibition studies were performed with methyl D-mannoside for the binding of TSF and IgG to Con A-ALP; IC50 values were found to be 90 μM and 286 μM, respectively. Surface coverages of proteins were estimated using solution depletion and the BCA protein concentration assay.

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Section: Introductionmentioning

confidence: 99%

Square-wave voltammetry assays for glycoproteins on nanoporous gold

Pandey

Bhattarai

Pornsuriyasak

et al. 2014

Journal of Electroanalytical Chemistry

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“…By combining with other synthesis or nanofabrication methods including polyol process, templated process, solid-state dewetting, and different nanolithography techniques, Au-Ag alloys can be formed in many specific forms, and after dealloying, the nanoporous gold can be obtained in the corresponding forms, including the forms of nanotubes [38], nanowires [39], nanoparticles [17,40,41], hollowed nanospheres [42], nanobowls [43], nanodisks [44,45], ordered array of nanoparticles and nanodisks [46][47][48].…”

Section: Fabrication Of Gold Nanosponges and Hybrid Nanospongesmentioning

confidence: 99%

Plasmonic nanosponges

Wang

Schaaf

2018

Advances in Physics: X

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Gold nanosponges, or nanoporous gold nanoparticles, possess a percolated nanoporous structure over the entire nanoparticles. The optical and plasmonic properties of gold nanosponges and its related hybrid nanosponges are very fascinating due to the unique structural feature, and are controllable and tuneable in a large scope by changing the structural parameters like pore/ligament size, porosity, particle size, particles form, and hybrid structure. The nanosponges show the strong polarization dependence and multiple resonances behavior. Besides, the nanosponges exhibit a significantly higher local field enhancement than the solid nanoparticles. Strong nonlinear optical properties are confirmed by their high-order photoemission behavior, whereby long-lived plasmon modes are also clearly observed. All this is very important and relevant for the applications in enhanced Raman scattering, fluorescence manipulation, sensing, and nonlinear photonics.

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“…For this purpose, we applied an electrochemical dealloying process to Au–Cu alloy nanowires, similarly to the conditions used in our previous work [24], to selectively leach copper from the alloy leaving behind a porous skeleton of gold [25–31]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Dealloying of gold–copper alloy nanowires: From hillocks to ring-shaped nanopores

Chauvin¹,

Delacôte²,

Boujtita³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryWe report on a novel fabrication approach of metal nanowires with complex surface. Taking advantage of nodular growth triggered by the presence of surface defects created intentionally on the substrate as well as the high tilt angle between the magnetron source axis and the normal to the substrate, metal nanowires containing hillocks emerging out of the surface can be created. The approach is demonstrated for several metals and alloys including gold, copper, silver, gold–copper and gold–silver. We demonstrate that applying an electrochemical dealloying process to the gold–copper alloy nanowire arrays allows for transforming the hillocks into ring-like shaped nanopores. The resulting porous gold nanowires exhibit a very high roughness and high specific surface making of them a promising candidate for the development of SERS-based sensors.

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Ordered arrays of nanoporous gold nanoparticles

Cited by 57 publications

References 24 publications

Square-wave voltammetry assays for glycoproteins on nanoporous gold

Square-wave voltammetry assays for glycoproteins on nanoporous gold

Plasmonic nanosponges

Dealloying of gold–copper alloy nanowires: From hillocks to ring-shaped nanopores

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