Hydrothermal synthesis of silver nanocubes with tunable edge lengths and their size dependent SERS behaviors

Jiang, Tao; Wang, Binbing; Zhang, Li; Zhou, Jun

doi:10.1016/j.jallcom.2015.01.164

Cited by 40 publications

(22 citation statements)

References 43 publications

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“…45 Various synthetic strategies such as polyol reduction, 38 plasmon 46 and photon driven synthesis 47 and seed-assisted growth 1 have been used to achieve the geometry-control of polyhedral Au NCs with the aim to deliberately tailor their plasmonic characteristics. 49 In this paper, we report a facile hydrothermal method for synthesizing colloidal Au NCs of diverse geometric features using CTAB as a structure-directing agent. It is oen desirable to realize convenient morphological control of Au NCs with simple synthetic progress in water-soluble environment.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of gold polyhedral nanocrystals by varying surfactant concentration and their LSPR and SERS properties

et al. 2015

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Several polyhedral gold nanocrystals (Au NCs) whose geometric morphology belongs to the Platonic solid and Archimedean solid groups are synthesized by modulating the cetyltrimethylammonium bromide (CTAB) concentration in the designed hydrothermal processes. The mechanism of growth of these polyhedral Au NCs is revealed via crystallographic analyses, which suggest that their morphologies mainly depend on the diminishing of the surface energy of the specific facets in the CTAB-directive shape-control process. Furthermore, the localized surface plasmon resonance (LSPR) properties of the as-prepared polyhedral Au NCs are numerically assessed using the finite element method (FEM). The calculations show that these polyhedral Au NCs exhibit geometry-dependence plasmonic properties: specifically, the enormous local field enhancements occur around their vertices and corners. The SERS spectra of 4-mercaptobenzoic acid molecules adsorbed on these polyhedral Au NCs display superior SERS activity with an enhancement factor of 10 5 to 10 6 at the excitation wavelength of 785 nm. Particularly, the truncated tetrahedron and bitetrahedron show higher SERS enhancement factors due to their LSPR being closer to the excitation wavelength of 785 nm. Thus, the facile surfactant-assisted synthesis offers the opportunity to design and optimize the shape-dependent SERS activity of polyhedral Au NCs with respect to possible applications in bio-sensing and imaging.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of gold polyhedral nanocrystals by varying surfactant concentration and their LSPR and SERS properties

et al. 2015

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“…It provides a novel molecule detection approach by great Raman signals amplification [4]. Briefly, the Raman signals of molecules adsorbed on the surface of noble metal nanostructures can be greatly enhanced through electromagnetic (EM) enhancement [5] and chemical enhancement (CE). Electromagnetic enhancement plays a dominant role for SERS, origins the local surface plasmon resonance (LSPR) from the interaction between excitation beam and metal nanostructures, thus greatly enhances the local EM field [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Nobel metal such as gold, silver, copper [5,6], and some alloy [9] can be promising candidates for SERS substrates. Among them, silver nanoparticles have attracted much attention due to their better performance than others [10,11].…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering Fiber Probe Based on Silver Nanocubes

Tian

et al. 2021

Adv. Fiber Mater.

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Surface-enhanced Raman scattering (SERS) provides a novel method for low concentration molecular detection. The performances were highly dependent on the sizes, geometries and distributions of metal nanostructures. Here, highly sensitive SERS fiber probe based on silver nanocubes (Ag NCs) was fabricated, by assembled nanostructures on planar and tapered fiber tips. Ag NCs were synthesized by polyol method, and controlled by reductant content, reaction temperatures and crystal growth durations. Tapered fibers with different cone angles were prepared by chemical etching. The electromagnetic distribution simulation indicated that nanocubes had stronger electric field between two cubes and vertex corners than nanosphere, under 532 nm laser excitation. The intensity could reach 53.52 V/m, for cubes with 70 nm edge length. The SERS performance of probes was characterized using crystal violet analyte. The detectable lowest concentration could reach 10 -9 and 10 -10 M for planar and tapered fiber probes, respectively. The corresponding enhancement factor could be 9.02 × 10 7 and 6.22 × 10 8 . The relationship between SERS peak intensities and analyte concentrations showed well linear, which indicated both fiber probes could be applied for both qualitative and quantitative analysis. Furthermore, optimal cone angle of tapered fiber SERS probe was 8.3°. The tapered fiber SERS probes have highly sensitive activity and great potential in substance detection.

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“…The synthesis of different edge-length nanocube strongly depends on the reaction atmosphere. 17 Various routes have been followed to synthesize silver nanocubes including polyol synthesis, 17,18 solvothermal method, 19–22 hydrothermal synthesis, 23 wet chemical method 24 and microwave assisted method. 25–27 In the synthesis process using ethylene glycol, silver nanocubes were synthesized by reducing the silver ions in ethylene glycol in the presence of polyvinylpyrrolidone (PVP) at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%