Self-formed silver nanoparticles on freestanding silicon nanowire arrays featuring SERS performances

Chien, Pin Ju; Zhou, Yongcun; Tsai, Kun Hung; Duong, Hong Phan; Chen, Chia Yun

doi:10.1039/c9ra03273h

Cited by 5 publications

(5 citation statements)

References 37 publications

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“…Unlike the typical way to vary the NW orientation through the diffusion-controlled local change of etchant concentrations in the etching condition [27,28], here both the concentrations of oxidants and etchants remained consistent and thus, the variation of etching direction was mainly contributed from the external bias. This might give rise to the feasibility for the realization of three-dimensional processing capability.…”

Section: Resultsmentioning

confidence: 82%

High-Speed and Direction-Controlled Formation of Silicon Nanowire Arrays Assisted by Electric Field

2020

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Metal-assisted chemical etching (MaCE), a low-cost and versatile method was considered a promising technique for preparing silicon nanowires (SiNWs), yet the lack of well controlling the injected holes within Si might reduce the etching rate, create the unwanted sidewall etching, and degrade the structural uniformity. Herein, in this study, the bias-modulated MaCE process was performed, showing the etching rates more than four times of magnitude than that of typical bias-free MaCE with large-area uniformity. It was found that the field-mediated hole rectification overwhelmed the effect of retarded diffusivity from reactive ions, and thus the dynamics of distributed etching were therefore transferred to the directional etching behaviors. In addition, the etching orientation could be also manipulated with the external bias. The results demonstrated that the etching direction was switched toward the slanted features by varying the electric polarization, creating the special slanted/vertical NW arrays, which possessed the superior antireflection characteristics than the conventional vertically aligned features.

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Section: Resultsmentioning

confidence: 82%

High-Speed and Direction-Controlled Formation of Silicon Nanowire Arrays Assisted by Electric Field

2020

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“…In the same direction, Chien et al explained the fabrication of freestanding SiNWs for flexible and on-sight SERS performance. 120 Figure 8 shows the schematic process for the design of freestanding SiNWs and corresponding SEM images.…”

Section: Demonstrated a Directmentioning

confidence: 99%

“… The ordered AgNRs are grown at various deposition time ranges from 0 to 60 s by an electroless deposition process. In the same direction, Chien et al explained the fabrication of freestanding SiNWs for flexible and on-sight SERS performance Figure shows the schematic process for the design of freestanding SiNWs and corresponding SEM images.…”

Section: Metal Nanoparticles Decorated Silicon Nanowiresmentioning

confidence: 99%

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Silicon Nanostructures for Molecular Sensing: A Review

Vendamani

Rao

Pathak

2022

ACS Appl. Nano Mater.

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This review presents a comprehensive synopsis of the recent developments and achievements in the research of nanosensors composed of plasmonic nanoparticles (NPs) and silicon nanostructures (NSs) for effective trace-level molecular detection. This review focuses intensively on the methodologies for the preparation and enforcement of a variety of SiNSs including (a) metal nanoparticles decorated silicon nanowires (NWs), (b) metal nanodendrites (NDs) on Si substrate, (c) plasmonic NPs decorated nanocrystalline porous silicon (pSi), and (d) silicon composed hybrid nanostructures with favorable parameters of importance in sensing. Furthermore, their potency in wide molecular sensing applications, especially chemical, biological, and explosive molecules based on surface enhanced Raman scattering (SERS) phenomenon is discussed in detail. Various demonstrations and categorizations are provided on the topic of Si-based NSs for a clear understanding to diverse readers. A roadmap is also provided at the end for achieving superior sensing materials or devices in the future.

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“…Besides, it remained questionable whether the reported methods were practical on-site detection while freeing from the requirement of sophisticated instrumentation. Alternatively, the visual detection of Cu 2+ ions [8][9][10] or other correlated metal ions [11][12][13][14][15] could be realized via a colorimetric route based on the effect of localized surface plasmon resonance (LSPR) [16][17][18], yet the underlying detection mechanism on the chemical-state examinations responding to the colour variation from selective detection of Cu 2+ ions was rarely investigated. More importantly, it remained to be quite desirable for the practical employment of colorimetric sending of Cu 2+ ions in circuit system with high detection selectivity and reliability.…”

Section: Introductionmentioning

confidence: 99%

Visual Cu2+ Detection of Gold-Nanoparticle Probes and its Employment for Cu2+ Tracing in Circuit System

Kuo

et al. 2022

Nanoscale Res Lett

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Highly sensitive, simple and reliable colorimetric probe for Cu2+-ion detection was visualized with the L-cysteine functionalized gold nanoparticle (LS-AuNP) probes. The pronounced sensing of Cu2+ with high selectivity was rapidly featured with obvious colour change that enabled to visually sense Cu2+ ions by naked eyes. By employing systemic investigations on crystallinities, elemental compositions, microstructures, surface features, light absorbance, zeta potentials and chemical states of LS-AuNP probes, the oxidation-triggered aggregation effect of LS-AuNP probes was envisioned. The results indicated that the mediation of Cu2+ oxidation coordinately caused the formation of disulfide cystine, rendering the removal of thiol group at AuNPs surfaces. These features reflected the visual colour change for the employment of tracing Cu2+ ions in a quantitative way.

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Self-formed silver nanoparticles on freestanding silicon nanowire arrays featuring SERS performances

Abstract: The formation of freestanding Si nanowire arrays with decorated Ag nanoparticles offers the SERS sensing capability.

Cited by 5 publications

References 37 publications

High-Speed and Direction-Controlled Formation of Silicon Nanowire Arrays Assisted by Electric Field

High-Speed and Direction-Controlled Formation of Silicon Nanowire Arrays Assisted by Electric Field

Silicon Nanostructures for Molecular Sensing: A Review

Visual Cu2+ Detection of Gold-Nanoparticle Probes and its Employment for Cu2+ Tracing in Circuit System

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