Formation of nanoporous Au by dealloying AuCu thin films in HNO3

Morrish, Rachel; Dorame, K; Muscat, Anthony J.

doi:10.1016/j.scriptamat.2011.01.021

Cited by 75 publications

(60 citation statements)

References 22 publications

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“…The formation of Cu-Zn porous structure fabricated in alkali solution was relatively slow when compared with previous studies 4,37 , requiring a duration of more than 24 h. In this paper, the metal sheet was considered as a homogenous medium, while the formation and development of dealloyed features/pores were thought as the formation of second phase in dilution solution. Therefore, basic parameters of the SAXS pattern, such as radius of gyration ( R g ), scattering volume ( V s ), and surface area ( A ), were measured to reveal the kinetics of early stage of Cu-Zn dealloying system.…”

Section: Methodsmentioning

confidence: 88%

An in-situ small angle x ray scattering analysis of nanopore formation during thermally induced chemical dealloying of brass thin foils

Bao

Döbeli

Mudie

et al. 2018

Sci Rep

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The development of non-noble nano-porous metal materials is hindered by surface oxidation reactions and from the difficulty to generate long range order pore arrays. Dealloying is a promising route to generate such materials by selective chemical etching of metal alloy materials. This process can generate nano-metal materials with superior plasmonic, catalytic and adsorptive surface properties. Here, the impact of properties of the etching solution on the dealloying process to generate nano-pores across thin film alloys was investigated by in-situ SAXS dealloying experiments. Single phase CuZn alloys were used as model materials to evaluate the influence of the solution temperature on the pore formation kinetics. This novel analysis allowed to visualize the change in surface properties of the materials over time, including their surface area as well as their pore and ligament sizes. The dealloying kinetics at the very early stage of the process were found to be critical to both stable pore formation and stabilization. SAXS in-situ data were correlated to the morphological properties of the materials obtained from ex-situ samples by Rutherford back scattering and scanning electron microscopy.

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Section: Methodsmentioning

confidence: 88%

An in-situ small angle x ray scattering analysis of nanopore formation during thermally induced chemical dealloying of brass thin foils

Bao

Döbeli

Mudie

et al. 2018

Sci Rep

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“…The samples used for terahertz emission experiments are thermally formed Cu 2 O thin films on gold substrates. During the process of heating copper to get the oxide film, inter-metallic compounds or alloys of Au∕Cu can be formed by diffusion [10]. In our experiments, this would mean that the interface we have is not an Au-Cu 2 O interface, but an AuCu-Cu 2 O interface.…”

Section: Interfacial Alloy Formationmentioning

confidence: 86%

Optical characterization of gold-cuprous oxide interfaces for terahertz emission applications

et al. 2014

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We show that the interface between gold and thermally formed cuprous oxide, which emits terahertz radiation when illuminated with ultrafast femtosecond lasers, is in fact an AuCu∕Cu 2 O interface due to the formation of the thermal diffusion alloy AuCu. The alloy enables the formation of a Schottkybarrier-like electric field near the interface which is essential to explain the THz emission from these samples. We confirm the formation of this AuCu layer by x-ray diffraction measurements, ellipsometry, and visual inspection. We determined the frequency-dependent complex refractive indices of the Cu 2 O and AuCu layer and verified them using reflection spectroscopy measurements. These refractive indices can be used for optimizing the thickness of Cu 2 O for maximum THz emission from these interfaces.

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“…To achieve a uniform nanoporous structure, the dealloying precursor should contain a homogenous structure at nanoscale. Usually, binary solid solutions and intermetallic alloys, such as Au-Ag, Au-Cu and Cu-Mn, are one of these ideal dealloying precursors [8][9][10][11][12] . Recently, there are some attempts to synthesize nanoporous metals by dealloying metallic glasses.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Pd with Tunable Pore Size prepared by Dealloying Pd 30Cu40Ni10P20 Metallic Glass and Their Catalytic Performance

et al. 2019

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This work reports the formation of nanoprous Pd with tunable pore size and high stability by dealloying Pd 30 Cu 40 Ni 10 P 20 metallic glass. The results show that lower dealloying temperature results in smaller pore size while the dealloying duration does not cause distinct change in the porous structure, even at an ambient dealloying temperature. The glassy structure and the multiple components in the precursor alloy are attributed to the hindered diffusion of Pd atoms and a slow coarsening rate of the nanoprous structure. The fully dealloyed porous sample with the smallest average pores size of 10 nm exhibit much higher catalytic activity when compare with the commercial Pd/C catalysts while the specimen with an average pores size of 13 nm shows the highest catalytic stability among the fully dealloyed alloys.

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Formation of nanoporous Au by dealloying AuCu thin films in HNO3

Cited by 75 publications

References 22 publications

An in-situ small angle x ray scattering analysis of nanopore formation during thermally induced chemical dealloying of brass thin foils

An in-situ small angle x ray scattering analysis of nanopore formation during thermally induced chemical dealloying of brass thin foils

Optical characterization of gold-cuprous oxide interfaces for terahertz emission applications

Nanoporous Pd with Tunable Pore Size prepared by Dealloying Pd 30Cu40Ni10P20 Metallic Glass and Their Catalytic Performance

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