Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia.
Department of Materials Science, Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia.
Sensors (Basel). 2020 Aug 27;20(17):4832. doi: 10.3390/s20174832.
Nowadays, analytical systems based on silver triangular nanoplates (AgTNPs) have been shown as good prospects for chemical sensing. However, they still remain relatively poorly studied as colorimetric probes for sensing various classes of compounds. This study shows that these nanoparticles are capable of being oxidized by peroxides, including both hydrogen peroxide and its organic derivatives. The oxidation was found to result in a decrease in the AgTNPs' local surface plasmon resonance band intensity at 620 nm. This was proposed for peroxide-sensitive spectrophotometric determination. Five peroxides differing in their structure and number of functional groups were tested. Three of them easily oxidized AgTNPs. The effects of a structure of analytes and main exterior factors on the oxidation are discussed. The detection limits of peroxides in the selected conditions increased in the series peracetic acid < hydrogen peroxide < -butyl hydroperoxide, coming to 0.08, 1.6 and 24 μmol L, respectively. -Butyl peroxybenzoate and di--butyl peroxide were found to have no effect on the spectral characteristics of AgTNPs. By the example of hydrogen peroxide, it was found that the determination does not interfere with 100-4000-fold quantities of common inorganic ions. The proposed approach was successfully applied to the analysis of drugs, cosmetics and model mixtures.
如今，基于银三角纳米片（AgTNPs）的分析系统已被证明在化学传感方面具有广阔的前景。然而，作为用于检测各种化合物的比色探针，它们的研究仍然相对较少。本研究表明，这些纳米颗粒能够被过氧化物氧化，包括过氧化氢及其有机衍生物。氧化导致在 620nm 处的 AgTNPs 局部表面等离子体共振带强度降低。这被提出用于过氧化物敏感分光光度法测定。测试了五种在结构和官能团数量上不同的过氧化物。其中三种很容易氧化 AgTNPs。讨论了分析物的结构和主要外部因素对氧化的影响。在选定条件下，过氧化物的检测限按过氧乙酸<过氧化氢<-丁基过氧化物的顺序增加，分别为 0.08、1.6 和 24μmol/L。过氧苯甲酸叔丁酯和过氧化二异丙苯对 AgTNPs 的光谱特性没有影响。以过氧化氢为例，发现该测定不会干扰 100-4000 倍常见无机离子的数量。该方法已成功应用于药物、化妆品和模型混合物的分析。
