Effect of wavelength and liquid on formation of Ag, Au, Ag/Au nanoparticles via picosecond laser ablation and SERS-based detection of DMMP.

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Beilstein Journal of Nanotechnology Pub Date : 2024-08-19 eCollection Date: 2024-01-01 DOI:10.3762/bjnano.15.86
Sree Satya Bharati Moram, Chandu Byram, Venugopal Rao Soma
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Abstract

The present study investigates the effects of input wavelength (1064, 532, and 355 nm) and surrounding liquid environment (distilled water and aqueous NaCl solution) on the picosecond laser ablation on silver (Ag), gold (Au), and Ag/Au alloy targets. The efficacy of the laser ablation technique was meticulously evaluated by analyzing the ablation rates, surface plasmon resonance peak positions, and particle size distributions of the obtained colloids. The nanoparticles (NPs) were characterized using the techniques of UV-visible absorption, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Furthermore, NPs of various sizes ranging from 6 to 35 nm were loaded onto a filter paper by a simple and effective drop-casting approach to achieve flexible surface-enhanced Raman spectroscopy (SERS) substrates/sensors. These substrates were tested using a simple, portable Raman device to identify various hazardous chemicals (malachite green, methyl salicylate, and thiram). The stability of the substrates was also systematically investigated by determining the decay percentages in the SERS signals over 60 days. The optimized SERS substrate was subsequently employed to detect chemical warfare agent (CWA) simulants such as methyl salicylate (a CWA simulant for sulfur mustard) and dimethyl methyl phosphonate (has some structural similarities to the G-series nerve agents) at different laser excitations (325, 532, and 633 nm). A notably higher SERS efficiency for CWA simulants was observed at a 325 nm Raman excitation. Our findings reveal that a higher ablation yield was observed at IR irradiation than those obtained at the other wavelengths. A size decrease of the NPs was noticed by changing the liquid environment to an electrolyte. These findings have significant implications for developing more efficient and stable SERS substrates for chemical detection applications.

波长和液体对通过皮秒激光烧蚀形成银、金、银/金纳米粒子的影响以及基于 SERS 的 DMMP 检测。
本研究探讨了输入波长(1064、532 和 355 纳米)和周围液体环境(蒸馏水和氯化钠水溶液)对银(Ag)、金(Au)和银/金合金靶上皮秒激光烧蚀的影响。通过分析所获得胶体的烧蚀率、表面等离子体共振峰位置和粒度分布,对激光烧蚀技术的功效进行了细致的评估。利用紫外可见吸收、透射电子显微镜和能量色散 X 射线光谱技术对纳米粒子(NPs)进行了表征。此外,通过简单有效的滴注方法,将 6 至 35 纳米不同大小的 NPs 装载到滤纸上,实现了灵活的表面增强拉曼光谱(SERS)基底/传感器。使用简单的便携式拉曼设备对这些基底进行了测试,以识别各种危险化学品(孔雀石绿、水杨酸甲酯和福双美)。此外,还通过测定 60 天内 SERS 信号的衰减率,对基底的稳定性进行了系统研究。优化后的 SERS 基底随后被用于在不同的激光激发波长(325、532 和 633 纳米)下检测化学战剂(CWA)模拟物,如水杨酸甲酯(硫芥子气的 CWA 模拟物)和甲基膦酸二甲酯(与 G 系列神经毒剂有一些结构相似之处)。在 325 纳米拉曼激发下,CWA 模拟物的 SERS 效率明显更高。我们的研究结果表明,与其他波长相比,红外照射下的烧蚀率更高。将液体环境改为电解质后,NPs 的尺寸有所减小。这些发现对于开发更高效、更稳定的 SERS 基底用于化学检测应用具有重要意义。
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来源期刊
Beilstein Journal of Nanotechnology
Beilstein Journal of Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
5.70
自引率
3.20%
发文量
109
审稿时长
2 months
期刊介绍: The Beilstein Journal of Nanotechnology is an international, peer-reviewed, Open Access journal. It provides a unique platform for rapid publication without any charges (free for author and reader) – Platinum Open Access. The content is freely accessible 365 days a year to any user worldwide. Articles are available online immediately upon publication and are publicly archived in all major repositories. In addition, it provides a platform for publishing thematic issues (theme-based collections of articles) on topical issues in nanoscience and nanotechnology. The journal is published and completely funded by the Beilstein-Institut, a non-profit foundation located in Frankfurt am Main, Germany. The editor-in-chief is Professor Thomas Schimmel – Karlsruhe Institute of Technology. He is supported by more than 20 associate editors who are responsible for a particular subject area within the scope of the journal.
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