Excellent surface enhanced Raman scattering obtained with nanoporous gold fabricated by chemical de-alloying

Xue, Yang; Scaglione, Federico; Paschalidou, Eirini Maria; Rizzi, Paola; Battezzati, Livio

doi:10.1016/j.cplett.2016.10.046

Cited by 26 publications

(17 citation statements)

References 28 publications

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“…Lattice parameter measured by a Rietveld refinement is close to that of pure Au within the experimental error. EDS performed on the NPG surface samples shows traces of Pd and Ag [29], not affecting the lattice parameter. On de-alloyed nanoporous gold, Pt electrodeposition was achieved by cyclic voltammetry technique in an electrolyte solution of 0.7 mM H 2 PtCl 6 and 0.5 M H 2 SO 4 from -0.2 to 0.5 V vs. Ag/AgCl for 5 and 30 cycles (Fig.S2).…”

Section: Resultsmentioning

confidence: 93%

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Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Xue

Scaglione

Rizzi

et al. 2019

Applied Surface Science

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In this work, Pt nanoparticles were electrodeposited through cyclic voltammetry technique on three dimensional nanoporous gold, which was prepared by chemical de-alloying of Au-based metallic glass precursor in the form of ribbon. The electro-catalytic properties of the as-prepared samples were tested through potential cycling towards methanol oxidation in alkaline solution. Current density plots vs scan numbers indicate that the electrodes are active for the electro-oxidation of methanol and the Pt electrodeposited on gold ligaments contributes in increasing catalytic properties. In particular, results indicate that nanoporous gold with 30 cycles Pt electrodeposition exhibits competitive higher activity and longer durability towards methanol electro-oxidation.

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Section: Resultsmentioning

confidence: 93%

“…Chemical de-alloying of the as-spun ribbons was conducted in mixture of 10 M HNO 3 and 0.5 M HF at 70 °C for 4 hours, conditions optimized in previous works [28,29]. After chemical de-alloying, the de-alloyed samples were deeply rinsed with distilled water.…”

Section: Methodsmentioning

confidence: 99%

Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Xue

Scaglione

Rizzi

et al. 2019

Applied Surface Science

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“…In the present study, we developed a new method to fabricate a substrate with a large surface area and Au-rich interconnected ligaments by dealloying the Au-based metallic glass ribbon (Au 55 Cu 25 Si 20 system) for SERS applications. It is worth noting that dealloying of AuCuAgPdSi metallic glass ribbon has been performed in HNO 3 solution to result in a nanoporous Au ligament structure, which gave rise to excellent SERS performance using pyridine as probe molecule 27 – 29 . This strong SERS enhancement was attributed to the localized enhanced electromagnetic fields around nano-sized ligaments, the electromagnetic coupling between ligaments, and the trapped SERS sensitive molecules 27 .…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that dealloying of AuCuAgPdSi metallic glass ribbon has been performed in HNO 3 solution to result in a nanoporous Au ligament structure, which gave rise to excellent SERS performance using pyridine as probe molecule 27 – 29 . This strong SERS enhancement was attributed to the localized enhanced electromagnetic fields around nano-sized ligaments, the electromagnetic coupling between ligaments, and the trapped SERS sensitive molecules 27 . Compared with dealloying of crystalline alloys, dealloying of metallic glasses would yield a more uniform nanoporous structure because metallic glasses are free from grain boundaries and other crystalline defects 27 .…”

Section: Introductionmentioning

confidence: 99%

“…This strong SERS enhancement was attributed to the localized enhanced electromagnetic fields around nano-sized ligaments, the electromagnetic coupling between ligaments, and the trapped SERS sensitive molecules 27 . Compared with dealloying of crystalline alloys, dealloying of metallic glasses would yield a more uniform nanoporous structure because metallic glasses are free from grain boundaries and other crystalline defects 27 .…”

Section: Introductionmentioning

confidence: 99%

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Gold-rich ligament nanostructure by dealloying Au-based metallic glass ribbon for surface-enhanced Raman scattering

Chao

et al. 2017

Sci Rep

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A new method to fabricate an Au-rich interconnected ligament substrate by dealloying the Au-based metallic glass ribbon for surface-enhanced Raman scattering (SERS) applications was investigated in this study. Specifically, three substrates, Au film, Au-based metallic glass ribbon, and dealloyed Au-based metallic glass ribbon, were studied. The dealloyed surface showed ligament nanostructure with protruding micro-islands. Based on the field emission scanning electron microscopy, reflection and scattering measurements, the dealloyed Au-based metallic glass provided a large surface area, multiple reflections, and numerous fine interstices to produce hot spots for SERS enhancements. The SERS signal of analyte, p-aminothiophenol, in the micro-island region of dealloyed Au-based metallic glass was about 2 orders of magnitude larger than the flat Au film. Our work provides a new method to fabricate the inexpensive and high SERS enhancements substrates.

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Amorphous molybdenum sulphide @ nanoporous gold as catalyst for hydrogen evolution reaction in acidic environment

et al. 2018

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A novel catalyst for water splitting has been prepared by Linear Sweep Voltammetry (LSV) deposition of amorphous MoS 2 on nanoporous gold (NPG) obtained by electrochemical de-alloying a metallic glass precursor, Au 40 Cu 28 Ag 7 Pd 5 Si 20 (at.%). As a function of number of CV cycles, Au ligaments are progressively encapsulated by a thin layer of amorphous MoS 2 catalyst for hydrogen evolution. NPG provides a good substrate for deposition having excellent properties of handability and mechanical resistance in addition to catalytic activity, high conductivity and high surface area. By controlling the number of cycles in LSV low onset potential, low Tafel slope and interesting values of exchange current density were obtained. The synergistic behaviour of the multicomponent material provides an highly efficient catalyst for hydrogen making of these samples a good candidate in some instances comparable to the conventional Pt catalyst for hydrogen evolution in acidic environment.

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Excellent surface enhanced Raman scattering obtained with nanoporous gold fabricated by chemical de-alloying

Cited by 26 publications

References 28 publications

Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Electrodeposited platinum on de-alloyed nanoporous gold with enhanced electro-catalytic performance

Gold-rich ligament nanostructure by dealloying Au-based metallic glass ribbon for surface-enhanced Raman scattering

Amorphous molybdenum sulphide @ nanoporous gold as catalyst for hydrogen evolution reaction in acidic environment

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