Morphology evolution and SERS activity of the nanoporous Au prepared by dealloying sputtered Au-Ag film

Hu, Liwei; Liu, Xue; Le, Guomin; Li, Jinfeng; Qu, Fengsheng; Lu, Siyuan; Qi, Li

doi:10.1016/j.physb.2019.01.019

Cited by 17 publications

(12 citation statements)

References 26 publications

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“…The Si wafer was previously coated by a Cr transition layer with thickness of ~20 nm by sputtering. The detailed procedures can be found elsewhere [16]. Au-Ag film samples with areas of ~10 × 10 mm 2 were used for electrochemical dealloying.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Chemical dealloying is one of the most employed methods for preparing NPG films [16,17]. By changing the dealloying time, temperature, and solution concentration, the morphology of the NPG can be adjusted, and relatively high SERS performance can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Xue [18] et al reported the detection limit of 10 −6 M of NPG by dealloying an Au-based metallic glass. Hu [16] et al obtained a high enhancement factor (EF) of 2.4 × 10 5 by dealloying an Au-Ag alloy. By employing electrochemical dealloying, the morphology of the NPG can be further effectively adjusted by introducing new controllable variables of potential and current [19].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Dealloying Preparation and Morphology Evolution of Nanoporous Au with Enhanced SERS Activity

Luo

et al. 2023

Coatings

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Nanoporous Au (NPG) prepared by dealloying is one of the most used substrates for surface-enhanced Raman scattering (SERS). The morphology tailoring of the NPG to obtain both ultrafine pores and suitable Au/Ag ratio is of great importance for the acquiring of enhanced SERS performance. Compared with the chemical dealloying, the electrochemical dealloying can tailor the NPG to be more flexible by the additional adjustment of dealloying voltage and current. Thus, further understanding on the morphology evolution of NPG during the electrochemical dealloying to obtain enhanced SERS performance is of great importance. In the presented work, the morphology and composition evolution of the NPG film during the electrochemical dealloying was investigated. NPG films with a stable pore diameter of approximately 11 nm as well as diverse compositions were obtained by electrochemical dealloying an Au-Ag alloy film. The prepared NPG film exhibits an enhanced SERS activity with an enhancement factor (EF) of 7.3 × 106 and an excellent detection limit of 10−9 M. This work provides insights into the morphology and composition evolution of the NPG during the electrochemical dealloying process to obtain enhanced SERS performance.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Dealloying Preparation and Morphology Evolution of Nanoporous Au with Enhanced SERS Activity

Luo

et al. 2023

Coatings

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“…Chemical dealloying has been widely used to fabricate nanoporous metals and metal oxides by selective etching/leaching of less reactive species in an acidic or basic medium ( Figure 1 a) [ 42 , 43 , 44 ]. This process has been applied to fabricate homogenous and crack-free nanoporous Au from different precursor alloys, including Au-Ag [ 45 ], Au-Ni [ 46 ], and Au-Cu [ 47 ]. Nanoporosity has evolved as a result of the dissolution of the less noble metal (Ag) layer-by-layer, followed by surface diffusion and reorganization of more noble metal (Au) at the interface [ 48 ].…”

Section: Dealloying For Fabricating Nanoporous Materialsmentioning

confidence: 99%

Recent Advancements in the Fabrication of Functional Nanoporous Materials and Their Biomedical Applications

et al. 2022

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Functional nanoporous materials are categorized as an important class of nanostructured materials because of their tunable porosity and pore geometry (size, shape, and distribution) and their unique chemical and physical properties as compared with other nanostructures and bulk counterparts. Progress in developing a broad spectrum of nanoporous materials has accelerated their use for extensive applications in catalysis, sensing, separation, and environmental, energy, and biomedical areas. The purpose of this review is to provide recent advances in synthesis strategies for designing ordered or hierarchical nanoporous materials of tunable porosity and complex architectures. Furthermore, we briefly highlight working principles, potential pitfalls, experimental challenges, and limitations associated with nanoporous material fabrication strategies. Finally, we give a forward look at how digitally controlled additive manufacturing may overcome existing obstacles to guide the design and development of next-generation nanoporous materials with predefined properties for industrial manufacturing and applications.

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“…Nanoporous gold (NPG) was proven to be a selectable SPR generator and applied in surface-enhanced Raman scattering (SERS) [ 12 , 13 ] due to its high biocompatibility, good chemical stability, easy surface modification via thiol-gold linker chemistry, and compatibility with conventional microfabrication [ 7 , 8 ]. Several methods reported in the literatures for fabricating NPG-based SERS substrate [ 13 , 14 , 15 , 16 ]. According to the previous results, hierarchical structure; ligament size and shape; and component and distance between nearby ligaments affect the SERS ability of NPM.…”

Section: Introductionmentioning

confidence: 99%

Surface Defects Improved SERS Activity of Nanoporous Gold Prepared by Electrochemical Dealloying

Zhang

Jing

et al. 2022

Nanomaterials

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Nanoporous metals possess excellent catalytic and optical properties that are related with surface morphology. Here, we modulated the ligament surface of nanoporous gold (NPG) by controlling electrochemical dealloying and obtained NPG with an improved enhancement of its surface-enhanced Raman scattering (SERS) property. We found that both high-density atomic steps and kinks on the curved surfaces and high-content silver atoms close to the ligament surface contributed to the high SERS ability. The presented strategy will be useful for the fabrication of nanoporous metal with an excellent surface that is needed for sensing, conversion, and catalytic

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Morphology evolution and SERS activity of the nanoporous Au prepared by dealloying sputtered Au-Ag film

Cited by 17 publications

References 26 publications

Electrochemical Dealloying Preparation and Morphology Evolution of Nanoporous Au with Enhanced SERS Activity

Electrochemical Dealloying Preparation and Morphology Evolution of Nanoporous Au with Enhanced SERS Activity

Recent Advancements in the Fabrication of Functional Nanoporous Materials and Their Biomedical Applications

Surface Defects Improved SERS Activity of Nanoporous Gold Prepared by Electrochemical Dealloying

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