Meng Xiangyu, Yu Jian, Shi Wenxiong, Qiu Lin, Qiu Keliang, Li Anran, Liu Zhen, Wang Yuening, Wu Jingjing, Lin Jie, Wang Xiaotian, Guo Lin
School of Chemistry, Beihang University, Beijing, 100191, China.
Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, P. R. China.
Angew Chem Int Ed Engl. 2024 Aug 12;63(33):e202407597. doi: 10.1002/anie.202407597. Epub 2024 Jul 11.
Aromatic amines are important commercial chemicals, but their carcinogenicity poses a threat to humans and other organisms, making their rapid quantitative detection increasingly urgent. Here, amorphous MoO (a-MoO) monolayers with localized surface plasmon resonance (LSPR) effect in the visible region are designed for the trace detection of carcinogenic aromatic amine molecules. The hot-electron fast decay component of a-MoO decreases from 301 fs to 150 fs after absorption with methyl orange (MO) molecules, indicating the plasmon-induced hot-electron transfer (PIHET) process from a-MoO to MO. Therefore, a-MoO monolayers present high SERS performance due to the synergistic effect of electromagnetic enhancement (EM) and PIHET, proposing the EM-PIHET synergistic mechanism in a-MoO. In addition, a-MoO possesses higher electron delocalization and electronic state density than crystal MoO (c-MoO), which is conducive to the PIHET. The limit of detection (LOD) for o-aminoazotoluene (o-AAT) is 10 M with good uniformity, acid resistance, and thermal stability. In this work, trace detection and identification of various carcinogenic aromatic amines based on a-MoO monolayers is realized, which is of great significance for reducing cancer infection rates.
芳香胺是重要的商业化学品，但其致癌性对人类和其他生物构成威胁，使得对其进行快速定量检测变得日益迫切。在此，设计了在可见光区域具有局域表面等离子体共振（LSPR）效应的非晶态MoO（a-MoO）单层用于痕量检测致癌芳香胺分子。在用甲基橙（MO）分子吸收后，a-MoO的热电子快速衰减分量从301 fs降至150 fs，表明存在从a-MoO到MO的等离子体诱导热电子转移（PIHET）过程。因此，由于电磁增强（EM）和PIHET的协同效应，a-MoO单层呈现出高表面增强拉曼散射（SERS）性能，提出了a-MoO中的EM-PIHET协同机制。此外，a-MoO比晶体MoO（c-MoO）具有更高的电子离域和电子态密度，这有利于PIHET。邻氨基偶氮甲苯（o-AAT）的检测限为10 M，具有良好的均匀性、耐酸性和热稳定性。在这项工作中，基于a-MoO单层实现了对各种致癌芳香胺的痕量检测和识别，这对于降低癌症感染率具有重要意义。
