Pham Thi Thu Ha, Vu Xuan Hoa, Dien Nguyen Dac, Trang Tran Thu, Van Hao Nguyen, Toan Nguyen Duc, Thi Ha Lien Nghiem, Tien Tong Sy, Chi Tran Thi Kim, Hien Nguyen Thi, Tan Pham Minh, Linh Dong Thi
Faculty of Chemistry, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen city 24000, Vietnam.
Institute of Science and Technology, TNU-University of Sciences, Tan Thinh ward, Thai Nguyen city 24000, Vietnam.
R Soc Open Sci. 2023 May 24;10(5):221623. doi: 10.1098/rsos.221623. eCollection 2023 May.
Recently, there have been publications on preparing hybrid materials between noble metal and semiconductor for applications in surface-enhanced Raman scattering (SERS) substrates to detect some toxic organic dyes. However, the use of cuprous oxide/silver (CuO/Ag) to measure the trace amounts of methyl orange (MO) has not been reported. Therefore, in this study, the trace level of MO in water solvent was determined using a SERS substrate based on CuO microcubes combined with silver nanoparticles (Ag NPs). Herein, a series of CuO/Ag ( 1-5) hybrids with various Ag amounts was synthesized via a solvothermal method followed by a reduction process, and their SERS performance was studied in detail. X-ray diffraction (XRD) and scanning electron microscopy results confirmed that 10 nm Ag NPs were well dispersed on 200-500 nm CuO microcubes to form CuO/Ag heterojunctions. Using the as-prepared CuO and CuO/Ag as MO probe, the CuO/Ag5 nanocomposite showed the highest SERS activity of all samples with the limit of detection as low to 1 nM and the enhancement factor as high as 4 × 10. The logarithm of the SERS peak intensity at 1389 cm increased linearly with the logarithm of the concentration of MO in the range from 1 nM to 0.1 mM.
最近，已有关于制备贵金属与半导体的混合材料用于表面增强拉曼散射（SERS）基底以检测某些有毒有机染料的文献报道。然而，尚未见使用氧化亚铜/银（CuO/Ag）来测定痕量甲基橙（MO）的报道。因此，在本研究中，使用基于CuO微立方体与银纳米颗粒（Ag NPs）结合的SERS基底测定了水溶剂中痕量水平的MO。在此，通过溶剂热法随后进行还原过程合成了一系列具有不同Ag含量的CuO/Ag（1 - 5）杂化物，并详细研究了它们的SERS性能。X射线衍射（XRD）和扫描电子显微镜结果证实，10 nm的Ag NPs良好地分散在200 - 500 nm的CuO微立方体上，形成了CuO/Ag异质结。以制备的CuO和CuO/Ag作为MO探针，CuO/Ag5纳米复合材料在所有样品中表现出最高的SERS活性，检测限低至1 nM，增强因子高达4×10。在1389 cm处SERS峰强度的对数与MO浓度的对数在1 nM至0.1 mM范围内呈线性增加。
