Influence of argon ion beam etching and thermal treatment on polycrystalline and single crystal gold electrodes Au(100) and Au(111)

Ahrens, Paula; Zander, Manfred; Hirsch, D.; Hasse, Ulrich; Wulff, H.; Frost, Frank; Scholz, Fritz

doi:10.1016/j.jelechem.2018.10.066

Cited by 7 publications

(8 citation statements)

References 38 publications

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“…Surface oxidation-reduction processes take place between 1.00 V and 1.64 V. There is a pre-oxidation signal between 1.00 V and 1.32 V with a maximum at 1.29 V, followed by a single broad anodic peak with a maximum at 1.41 V. This single anodic signal has been reported previously for highly rough and disordered gold surfaces obtained after etching with Ar + . [29] The pre-oxidation signal has neither been described before for NPG nor for other highly rough surfaces. [25] The somewhat similar surface electrochemistry of NPG (Figure 1) and intentionally roughened surfaces in Refs.…”

Section: Filling Of Cavity and Morphological Characterization Of Npgmentioning

confidence: 99%

“…[25] The somewhat similar surface electrochemistry of NPG (Figure 1) and intentionally roughened surfaces in Refs. [25] and [29] is plausible when considering that the highly curved surface of individual ligaments in NPG is dominated by step and kink defects that truncate the metal crystal at the surface. The potential scan is reversed at the so-called Burshtein minimum, [30] at which one oxide monolayer is formed and a further current increase due to water oxidation or oxide multilayer formation has not started yet.…”

Section: Filling Of Cavity and Morphological Characterization Of Npgmentioning

confidence: 99%

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Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

2020

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The electrochemical behavior of nanoporous gold (NPG) obtained by dealloying a AgAu alloy has been investigated by means of cyclic voltammetry (CV) in 0.1 M H2SO4 and 0.1 M KOH solutions supplemented by X‐ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) in order to understand different effects of the electrochemical treatment on the development of the surface structure of NPG. In order to reduce the IR drop caused by the high surface area of the bicontinuous network of pores and ligaments in NPG, NPG was transformed to a powder, from which a small portion was filled into a cavity microelectrode (CME). Additionally, this avoided sample‐to‐sample variation from the dealloying process because many fillings could be made from one NPG monolith. The cycling in 0.1 M H2SO4 led to restructuring of the surface to a more faceted one, only after the residual silver on the surface had been removed in the initial scan. The same cycling program in 0.1 M KOH did not cause restructuring. However, a transfer of the sample to 0.1 M H2SO4 could start the process. The ligament size did not change during restructuring. Additionally, it was found that residual Ag in NPG stabilizes the highly curved surfaces of the ligaments containing a high density of surface defects. The dissolution of the residual Ag in acid electrolytes lifts the blockage towards surface restructuring. These findings form a basis for understanding the electrochemical behavior of NPG and to devise appropriate treatments, for instance for their use in electrocatalysis.

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Section: Filling Of Cavity and Morphological Characterization Of Npgmentioning

confidence: 99%

Section: Filling Of Cavity and Morphological Characterization Of Npgmentioning

confidence: 99%

Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

2020

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“…Furthermore, underpotential deposition (UPD) of Pb 2+ ions was employed to identify the exposed surface. 26 As shown in Fig. 3b, the peaks appearing at 0.24 V and at 0.31 V correspond to the bulk deposition and stripping peak of lead, 27 and Ag powder shows a weak UPD peak around 0.47 V vs. RHE which corresponds to the Pb desorption from the Ag(111) planes.…”

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confidence: 86%

A silver catalyst with a high-energy surface prepared by plasma spraying for the hydrogen evolution reaction

Bai

Kang

et al. 2022

Chem. Commun.

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“…The addition of inert gases makes it possible to increase the intensity of the ion bombardment of the etching bottom and therefore potentially change the shape of Si wires formed during the process. Argon (Ar) is widely used for the ion beam etching process. , There are a few reports where argon was added for RIE of Si through a mask. Chen et al reported about the effect of alternating Ar and SF 6 /C 4 F 8 gas flows in Si plasma etching.…”

Section: Introductionmentioning

confidence: 99%

“…Argon (Ar) is widely used for the ion beam etching process. 18,19 There are a few reports where argon was added for RIE of Si through a mask. Chen et al reported about the effect of alternating Ar and SF 6 /C 4 F 8 gas flows in Si plasma etching.…”

Section: ■ Introductionmentioning

confidence: 99%

Study of Cryogenic Unmasked Etching of “Black Silicon” with Ar Gas Additives

et al. 2022

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The influence of Ar gas additives on ≪black silicon≫ formation is shown in this work. The way to achieve the conical shape of Si texture using low Ar dilution is demonstrated. Also, a possibility of silicon nanowire width reduction keeping a high density of array is shown. No damage to the Si structure caused by Ar plasma was detected. The introduction of Ar into the plasma also does not affect electrical properties. The lifetime value after cryogenic etching with 5 sccm Ar flow remains at the same level of 0.7 ms. The resulting black silicon has a low total reflectance of 1 ± 0.5% in the range of 450–1000 nm in the overall 100 mm Si wafer surface.

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Influence of argon ion beam etching and thermal treatment on polycrystalline and single crystal gold electrodes Au(100) and Au(111)

Cited by 7 publications

References 38 publications

Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

Restructuring of Nanoporous Gold Surfaces During Electrochemical Cycling in Acidic and Alkaline Media

A silver catalyst with a high-energy surface prepared by plasma spraying for the hydrogen evolution reaction

Study of Cryogenic Unmasked Etching of “Black Silicon” with Ar Gas Additives

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