School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai, 201418, People's Republic of China.
Shanghai Key Laboratory of Functional & School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, People's Republic of China.
Mikrochim Acta. 2019 Feb 15;186(3):175. doi: 10.1007/s00604-019-3305-0.
A method is described for surface-enhanced Raman scattering (SERS) discrimination of formaldehyde (FA) and acetaldehyde (AA) in aqueous sample solutions. It is based on the use of a paper strip containing 4-aminothiophenol (Atp)-modified reduced graphene oxide (rGO)/[Ag(NH)] (rGO/[Ag(NH)]/Atp). The addition of FA or AA induces the conversion of [Ag(NH)] complex to silver nanoparticles (AgNPs) because of aldehyde-induced silver reduction reaction. The AgNPs possess strong SERS activity. The average interparticle gaps between the AgNPs can be fine-tuned by controlling the experimental conditions, this leading to the formation of optimized SERS hot spots. It is also found that the changes in the spectral shapes and the relative intensity ratio of the bands at 1143 and 1072 cm result from the difference in the pH value of the surrounding solution. This effect enables the selective discrimination of FA and AA. The paper strip can be used as a SERS dipstick and swab for on-site determination of FA or AA in wine and human urine via the differences in the intensity of the SERS peaks. The assay works over a wide range of concentrations (0.45 ng·L to 480 μg·L) for FA and AA, and the respective detection limits are 0.15 and 1.3 ng·L. Graphical abstract Schematic presentation of the preparation procedure of 4-aminothiophenol (Atp)-modified reduced graphene oxide (rGO)/[Ag(NH)] hybrid paper and its surface-enhanced Raman scattering discrimination of formaldehyde and acetaldehyde based on silver reduction.
一种用于水相样品溶液中甲醛（FA）和乙醛（AA）的表面增强拉曼散射（SERS）区分的方法。它基于使用含有 4-巯基苯胺（Atp）修饰的还原氧化石墨烯（rGO）/[Ag（NH）]（rGO/[Ag（NH）] /Atp）的纸条。由于醛诱导的银还原反应，FA 或 AA 的加入会导致[Ag（NH）]配合物转化为银纳米粒子（AgNPs）。AgNPs 具有很强的 SERS 活性。通过控制实验条件，可以微调 AgNPs 之间的平均粒子间间隙，从而形成优化的 SERS 热点。还发现，由于周围溶液 pH 值的不同，谱形和 1143 和 1072cm 处带的相对强度比的变化导致 FA 和 AA 的选择性区分。该效果可用于通过 SERS 峰强度的差异，选择性地鉴别葡萄酒和人尿中的 FA 和 AA。纸条可作为 SERS 棒和拭子，用于现场测定 FA 或 AA，其 FA 和 AA 的测定范围很宽，浓度为 0.45ng·L 至 480μg·L，检测限分别为 0.15 和 1.3ng·L。
