An Analysis Study Employing Laser Ablation in Gold Colloidal at Different Numbers of Laser Pulses

IF 4.3 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2025-05-15 DOI:10.1007/s11468-025-02998-2

Evan T. Salim, Rana O. Mahdi, Doaa Mahmoud, Subash C. B. Gopinath, Forat H. Alsultany

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Abstract

This study investigated the influence of laser pulse count on the properties of Au@WO₃ core–shell nanoparticles synthesized via pulsed laser ablation in liquid (PLAL). A 1064-nm Nd:YAG laser with a fluence of 19.10 J/cm² was employed to fabricate the nanostructures using varying numbers of laser pulses (200–1200). The optical absorption spectra revealed two distinct peaks attributed to the surface plasmon resonance of Au and the absorption edge of WO₃, with a gradual red shift in the latter. Furthermore, a corresponding decrease in the optical band gap from 3.20 to 3.00 eV was observed with increasing pulse count. Photoluminescence analysis showed enhanced emission intensity and red-shifted peaks, suggesting an increase in shell thickness and improved excitonic activity. XRD confirmed the formation of monoclinic WO₃ and embedded Au cores, while Raman spectroscopy further validated the vibrational modes of the WO₃ shell. FE-SEM and TEM imaging demonstrated an increase in both particle size and shell thickness with higher pulse counts, ranging from 51 to 95 nm. EDX analysis revealed a progressive increase in the weight percentage of tungsten and oxygen atoms, supporting the formation of a thicker WO₃ shell. Overall, the results demonstrated that laser pulse control in PLAL synthesis offered a tunable method for engineering the structural and optical properties of Au@WO₃ core–shell nanoparticles for diverse applications.

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不同脉冲数激光烧蚀金胶体的分析研究

研究了激光脉冲数对液体脉冲激光烧蚀合成Au@WO₃核壳纳米粒子性能的影响。利用波长为19.10 J/cm2的1064 nm Nd:YAG激光器，利用200 ~ 1200个不同的激光脉冲数制备了纳米结构。光学吸收光谱显示两个明显的峰，分别属于Au的表面等离子体共振和WO 3的吸收边缘，后者的吸收边缘有逐渐的红移。此外，随着脉冲数的增加，光学带隙从3.20 eV减小到3.00 eV。光致发光分析显示，其发射强度增强，峰红移，表明壳层厚度增加，激子活性提高。XRD证实了单斜斜WO₃的形成和嵌入的Au核，Raman光谱进一步验证了WO₃壳层的振动模式。FE-SEM和TEM成像显示，随着脉冲数的增加，颗粒大小和壳厚度都增加，范围从51到95 nm。EDX分析显示，钨和氧原子的重量百分比逐渐增加，这支持了WO₃壳层的形成。总的来说，结果表明，激光脉冲控制在PLAL合成中为Au@WO₃核壳纳米粒子的结构和光学性质的工程提供了一种可调的方法，用于不同的应用。

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来源期刊

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.