Ion Beam Synthesis of SERS Substrate

Akanksha Motla, Sumaya Nisar, V. Baranwal, K. Sharma, B. Sundarawel, Nita Dilawar Shrama, S. Khan, D. Avasthi
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Abstract

Surface Enhanced Raman Spectroscopy (SERS) is a powerful tool to amplify weak Raman signals by an increment of the apparent Raman cross-section of the analytes. The present work reports on ion beam synthesized SERS substrates. Thin films of Au were deposited on quartz substrate using ion beam sputtering. The films were further irradiated by 1.36 MeV Xe ions to a fluence of 1015 and 1016 ion/cm2. Rutherford Backscattering (RBS) was performed for Au thin film deposited on quartz to evaluate the Au content. Thickness of the film was found to be -- 7.8nm by RBS. The FESEM was performed for pristine and irradiated samples which revealed the formation of separated distinguishable Au nanoparticles in irradiated samples. The UV-Visible spectroscopy was carried out for pristine and irradiated materials which indicated surface plasmon resonance due to the formation of Au nanoparticles after ion irradiation. The assessment of SERS was performed on High Resolution Raman using 10−4M di-nitro salicylic acid (DNSA) as a model analyte, which has a similar chemical structure to the commonly found explosives. The presence of NO2group and aromatic ring stretching vibration were observed on the irradiated sample which were otherwise not observed on the pristine sample. Hence, this demonstrated ion beam synthesis of SERS substrate.
SERS衬底的离子束合成
表面增强拉曼光谱(SERS)是一种强大的工具,可以通过增加分析物的表观拉曼截面来放大弱拉曼信号。本文报道了离子束合成SERS衬底的研究进展。采用离子束溅射技术在石英衬底上沉积了金薄膜。用1.36 MeV的Xe离子辐照膜,辐照量分别为1015和1016离子/cm2。采用卢瑟福后向散射法(RBS)对沉积在石英上的金薄膜进行了评价。通过RBS检测发现膜的厚度为- 7.8nm。对原始样品和辐照样品进行了FESEM分析,发现在辐照样品中形成了分离的可区分的金纳米颗粒。对原始材料和辐照材料进行了紫外可见光谱分析,发现离子辐照后形成的金纳米粒子引起表面等离子体共振。使用10−4M二硝基水杨酸(DNSA)作为模型分析物,在高分辨率拉曼光谱下进行SERS评估,该分析物具有与常见爆炸物相似的化学结构。在辐照后的样品上观察到no2基团的存在和芳香环的伸缩振动,而在原始样品上没有观察到。因此,这证明了离子束合成的SERS底物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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