Hybridizing Carbon-Based Dot-Capped Manganese Dioxide Nanosheets and Gold Nanoparticles as a Highly Sensitive Surface-Enhanced Raman Scattering Substrate.
Hybridizing Carbon-Based Dot-Capped Manganese Dioxide Nanosheets and Gold Nanoparticles as a Highly Sensitive Surface-Enhanced Raman Scattering Substrate.
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DOI：
10.1021/acs.analchem.1c01181
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发表时间：
2021-07
影响因子：
7.4
通讯作者：
Qian Wang;Rongjing Hu;Mingming Chen;Jiaxin Zhang;Lichan Chen;Zhen Lin;Yongqiang Dong;Fengfu Fu
中科院分区：
文献类型：
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作者：
Qian Wang;Rongjing Hu;Mingming Chen;Jiaxin Zhang;Lichan Chen;Zhen Lin;Yongqiang Dong;Fengfu Fu
表面增强拉曼散射（Sers）是一种灵敏的、非破坏性的分子结构信息提取技术。设计和构建灵敏、稳定Sers基底对该技术的应用具有重要意义。在这项研究中，单层碳基点（CD）被用来作为封端剂，以合成金纳米粒子（AuNPs/CD）和二氧化锰纳米片（MnO 2/CD），然后通过一个简单的共离心法杂化。杂化后，单分散的AuNPs/CDs明显聚集成团簇，由于电磁“热点”效应而表现出较强的Sers活性，而MnO 2/CDs由于电荷转移共振效应也表现出较强的Sers活性。所获得的纳米杂化物（MnO 2/CD/AuNPs）具有稳健的化学稳定性，联合收割机与AuNPs/CD的电磁增强和MnO 2/CD的化学增强很好地结合，导致3.9 × 108的电磁增强因子。基于这种新型Sers基底，建立了一种灵敏、快速的孔雀石绿色检测传感系统，其检测下限为1 × 10-9 M。该工作为设计和制备高性能的Sers基底提供了一个有价值的模型。
Surface-enhanced Raman Scattering (SERS) is a sensitive and nondestructive technique that provides fingerprint structural information of molecules. Designing and constructing sensitive and stable SERS substrates is of great significance for the application of the technique. In this study, single-layer carbon-based dots (CDs) are used as capping agents to synthesize gold nanoparticles (AuNPs/CDs) and manganese dioxide nanosheets (MnO2/CDs), which are then hybridized through a simple cocentrifugation method. After the hybridization, the monodispersive AuNPs/CDs aggregate obviously into some clusters exhibiting strong SERS activity due to the electromagnetic "hot spots" effect, and the MnO2/CDs also show outstanding SERS activity due to the charge-transfer resonance effect. The obtained nanohybrids (MnO2/CDs/AuNPs) with robust chemical stability combine well with the electromagnetic enhancement of AuNPs/CDs and chemical enhancement of MnO2/CDs, leading to an ultrahigh enhancement factor of 3.9 × 108. Based on the novel SERS substrate, a sensitive and rapid sensing system for the detection of malachite green is developed, with a low detection limit of 1 × 10-9 M. This work provides a valuable model for designing and fabricating high-performance SERS substrates.