State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.
Molecules. 2023 May 24;28(11):4288. doi: 10.3390/molecules28114288.
ReS, as a new member of transition metal dichalcogenides (TMDCs), has emerged as a promising substrate for semiconductor surface-enhanced Raman spectroscopy (SERS) due to its unique optoelectronic properties. Nevertheless, the sensitivity of the ReS SERS substrate poses a significant challenge to its widespread application in trace detection. In this work, we present a reliable approach for constructing a novel ReS/AuNPs SERS composite substrate, enabling ultrasensitive detection of trace amounts of organic pesticides. We demonstrate that the porous structures of ReS nanoflowers can effectively confine the growth of AuNPs. By precisely controlling the size and distribution of AuNPs, numerous efficient and densely packed "hot spots" were created on the surface of ReS nanoflowers. As a result of the synergistic enhancement of the chemical and electromagnetic mechanisms, the ReS/AuNPs SERS substrate demonstrates high sensitivity, good reproducibility, and superior stability in detecting typical organic dyes such as rhodamine 6G and crystalline violet. The ReS/AuNPs SERS substrate shows an ultralow detection limit of 10 M and a linear detection of organic pesticide molecules within 10-10 M, which is significantly lower than the EU Environmental Protection Agency regulation standards. The strategy of constructing ReS/AuNPs composites would contribute to the development of highly sensitive and reliable SERS sensing platforms for food safety monitoring.
ReS 作为过渡金属二卤化物 (TMDCs) 的新成员，由于其独特的光电特性，已成为半导体表面增强拉曼光谱 (SERS) 的有前途的衬底。然而，ReS SERS 衬底的灵敏度对其在痕量检测中的广泛应用构成了重大挑战。在这项工作中，我们提出了一种可靠的方法来构建新型 ReS/AuNPs SERS 复合材料衬底，从而能够对痕量有机农药进行超灵敏检测。我们证明了 ReS 纳米花的多孔结构可以有效地限制 AuNPs 的生长。通过精确控制 AuNPs 的尺寸和分布，在 ReS 纳米花的表面上形成了许多高效且密集的“热点”。由于化学和电磁机制的协同增强，ReS/AuNPs SERS 衬底在检测典型有机染料如罗丹明 6G 和结晶紫时表现出高灵敏度、良好的重现性和优异的稳定性。ReS/AuNPs SERS 衬底的检测限低至 10 M，对 10-10 M 范围内的有机农药分子具有线性检测，明显低于欧盟环境保护署的规定标准。构建 ReS/AuNPs 复合材料的策略将有助于开发用于食品安全监测的高灵敏度和可靠的 SERS 传感平台。
