Porous metallic structures by dealloying amorphous alloys

Vassileva, Ev.; Mihaylov, L.; Lyubenova, L.; Spassov, T.; Scaglione, F.; Rizzi, P.

doi:10.1016/j.jallcom.2023.172417

Cited by 8 publications

(4 citation statements)

References 131 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The SERS effect of the protrusion is of fundamental importance for evaluating/predicting the SERS enhancement of different nanoporous metallic films with nanosized protrusions, as well as guiding the design. Moreover, although the dealloying of metallic glasses is capable of fabricating nanoporous metallic films with protrusions, preparation of a complete amorphous precursor and the harsh etching environment are problematic for facile fabrication and the choice of substrate. , …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, although the dealloying of metallic glasses is capable of fabricating nanoporous metallic films with protrusions, preparation of a complete amorphous precursor and the harsh etching environment are problematic for facile fabrication and the choice of substrate. 1,20 These problems cannot be satisfactorily addressed without a fundamental understanding of the near-field enhancement of protrusions and careful choice of the strategy for nanoporous metallic films with nanosized protrusions. Plasma oxidation− reduction, in which samples are successively treated with oxidative plasma and reductive plasma, has been recently developed to fabricate nanoporous Ag films, taking advantage of facile fabrication, vacuum environment, and no restriction on the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Surface-enhanced Raman scattering (SERS) has been widely used for trace-level detection of organic and biomedical molecules due to the considerably enhanced Raman signal on SERS substrates. Nanoporous metallic films, which are composed of metallic ligaments and nanopores, have attracted great attention as SERS substrates. − Techniques such as templating, dealloying, and physical vapor deposition are commonly used to fabricate nanoporous metallic films. − Nanoporous Ag films exhibit practical applicability for SERS detection of organic materials banned as food additives. , …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanoporous Silver Films for Surface-Enhanced Raman Scattering-Based Sensing

Yuan,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Nanoporous metallic films have attracted great attention as surface-enhanced Raman scattering (SERS) substrates. The presence of nanosized protrusions in such nanoporous metallic films gives rise to remarkably improved SERS enhancement due to an additional lightning rod effect of protrusions. However, the positive contribution of protrusions was only preliminarily demonstrated by SERS measurements so far, and several important questions remain unaddressed�fundamental understanding into the near-field enhancement of protrusions, qualitative link between the measured SERS enhancement and properties of protrusions, and facile strategy for nanoporous metallic films with protrusions. In this paper, plasma oxidation−reduction of Ag nanofilms was used to fabricate various nanoporous Ag films with nanosized protrusions. The fundamental protrusion size dependence of near-field enhancement was elucidated from both the electrodynamic model and FDTD simulation, with the protrusion approximately treated as a hemiprolate spheroid positioned on a semi-infinite metallic base. With the as-fabricated nanoporous Ag films as the SERS substrates, the qualitative link between the measured SERS enhancement and density/size distribution of protrusions was established. The findings reported here contribute significantly to gaining deeper insight into the SERS enhancement of nanoporous metallic films and guiding future SERS substrate design.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanoporous Silver Films for Surface-Enhanced Raman Scattering-Based Sensing

Yuan,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Additionally, the free electrons in metallic glasses and the reactive interfaces relying on porous frameworks regulate the atomic coordination environment and the electronic structure in active centers, thereby significantly enhancing catalytic activity. 27–29 Therefore, the development of micro-nanoporous catalysts possessing large surface area, sufficient porosity and high stability can improve the catalytic activity and reusability of contaminant degradation processes.…”

Section: Introductionmentioning

confidence: 99%

Surface activation via selective dealloying of Cu-based metallic glasses for efficient catalytic behavior

Zhao,

Wang,

Zhang

et al. 2024

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Tailoring Atomic Ordering Uniformity Enables Selectively Leached Nanoporous Pd‐Ni‐P Metallic Glass for Enhanced Glucose Sensing

Lou,

Li,

Yao

et al. 2024

Advanced Science

View full text Add to dashboard Cite

Constructing nanostructures, such as nanopores, within metallic glasses (MGs) holds great promise for further unlocking their electrochemical capabilities. However, the MGs typically exhibit intrinsic atomic‐scale isotropy, posing a significant challenge in directly fabricating anisotropic nanostructures using conventional chemical synthesis. Herein a selective leaching approach, which focuses on tailoring the uniformity of atomic ordering, is introduced to achieve pore‐engineered Pd‐Ni‐P MG. This innovative approach significantly boosts the number of exposed active sites, thereby enhancing the electrochemical sensitivity for glucose detection. Electrochemical tests reveal that the nanoporous Pd‐Ni‐P MG exhibits high sensitivity (3.19 mA mm⁻¹ cm⁻2) and remarkable stability (97.7% current retention after 1000 cycles). During electrochemical cycling, synchrotron X‐ray pair distribution function and X‐ray absorption fine structure analyses reveal that the distance between active sites decreases, enhancing electron transport efficiency, while the medium‐range ordered structure of the Pd‐Ni‐P MG remains stable, contributing to its exceptional glucose sensing capabilities. A microglucose sensor is successfully developed by integrating the nanoporous Pd‐Ni‐P MG with a screen‐printed electrode, demonstrating the practical applicability. This study not only offers a new avenue for the design of highly active nanoporous MGs but also sheds light on the mechanisms behind the high electrochemistry performance of MGs.

show abstract

Porous metallic structures by dealloying amorphous alloys

Cited by 8 publications

References 131 publications

Nanoporous Silver Films for Surface-Enhanced Raman Scattering-Based Sensing

Nanoporous Silver Films for Surface-Enhanced Raman Scattering-Based Sensing

Surface activation via selective dealloying of Cu-based metallic glasses for efficient catalytic behavior

Tailoring Atomic Ordering Uniformity Enables Selectively Leached Nanoporous Pd‐Ni‐P Metallic Glass for Enhanced Glucose Sensing

Contact Info

Product

Resources

About