Facile fabrication of 3D silver micro-particles with nano-flower structured surface and their evaluation as a surface enhanced Raman spectroscopy substrate

IF 2.1 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2025-02-27 DOI:10.1007/s11051-025-06272-8

Mayra L. Melgoza-Ramírez, M. A. Meneses-Nava, Mario Rodríguez, J.-L. Maldonado

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Abstract

Attractive flower-shaped silver nanostructures with abundant nano-gaps were synthesized by a rapid one-step chemical reduction method at room temperature in the presence of as reducing agent and PVP as surfactant. The morphological and optical properties of the obtained 3D silver nano-flowers (AgNFs) were characterized by FE-SEM, XRD, and UV-VIS spectroscopy. The SEM images revealed the formation of AgNFs with high nano-textured surface morphologies. The AgNFs obtained at high phenylhydrazine concentration favor the nanoscale roughness that contributes significantly to the high sensitivity of surface-enhanced Raman scattering (SERS) activity. The AgNFs were found to possess excellent stability and can be stored for several months. SERS substrates had a limit of detection (LoD) of 2.1×10⁻⁷ M obtained for Rhodamine B (RhB). Furthermore, two chloride salts (NaCl and MgCl₂) were added to AgNFs suspension to improve the SERS signal. Under optimal conditions, the SERS substrates prepared with various salts exhibit increased sensitivity and higher intensity levels compared to those without the addition of salts. The SERS substrates showed an enhancement in LoD on the order of 10⁻⁹ M obtained for both RhB and rhodamine 6G (Rh6G) used as SERS probes. This work shows a promising approach to developing a SERS platform for the detection of organic chromophores.

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具有纳米花结构表面的三维银微粒的快速制备及其作为表面增强拉曼光谱衬底的评价

以PVP为表面活性剂，以还原剂为还原剂，采用一步化学还原法在室温下合成了具有丰富纳米间隙的花状银纳米结构。利用FE-SEM、XRD和UV-VIS光谱对制备的三维银纳米花（AgNFs）进行了形貌和光学性质表征。SEM图像显示形成了具有高纳米结构的AgNFs表面形貌。在高苯基肼浓度下获得的AgNFs有利于纳米尺度的粗糙度，这有助于表面增强拉曼散射（SERS）活性的高灵敏度。发现AgNFs具有优异的稳定性，可以保存数月。SERS底物对Rhodamine B （RhB）的检出限（LoD）为2.1×10−7 M。此外，在AgNFs混悬液中加入两种氯化盐（NaCl和MgCl2）来改善SERS信号。在最佳条件下，与未添加盐的SERS底物相比，添加各种盐制备的SERS底物具有更高的灵敏度和更高的强度水平。SERS底物对RhB和rhodamine 6G （Rh6G）的LoD均有10−9 M量级的增强。这项工作显示了一种有前途的方法来开发用于检测有机发色团的SERS平台。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.