Plasmonic Molybdenum Tungsten Oxide Hybrid with Surface-Enhanced Raman Scattering Comparable to that of Noble Metals.,ACS Applied Materials & Interfaces

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Plasmonic Molybdenum Tungsten Oxide Hybrid with Surface-Enhanced Raman Scattering Comparable to that of Noble Metals.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-10 , DOI: 10.1021/acsami.0c00220
Peng Li ₁ , Lin Zhu ₁ , Chao Ma _{1,

2} , Lixia Zhang _{1,

2} , Lin Guo ₁ , Yawen Liu ₁ , Hao Ma ₁ , Bing Zhao ₁

Affiliation

The surface-enhanced Raman scattering (SERS) research is in full swing owing to its high sensitivity and high selectivity; however, the substrates with superexcellent performance for SERS are largely confined to noble metals (Au, Ag, etc.). Although the SERS active substrates have been extended to semiconductors and transition metals, it is frustrating that their sensitivities are insufficient for widespread practical application. Here, we report the plasmonic molybdenum tungsten oxide (MWO) hybrid nanomaterials (NMs), which can be used as high-performance substrates with SERS comparable to that of noble metals. MWO NMs can achieve the trace detection of rhodamine 6G (R6G), basic fuchsin (BF), and oil red O (ORO). The detection limit concentration for R6G is 10-8 M, with the maximum enhancement factor of up to 6.09 × 107. The superexcellent SERS performance was attributed to the cooperative enhancement effect of electromagnetic (EM) enhancement mechanism and the charge transfer (CT) mechanism. Moreover, in the proposed system, the EM and CT contribution was distinguished by employing poly(vinylpyrrolidone) (PVP), which serves as a barrier layer to prevent the CT process from MWO NMs to R6G. These remarkable MWO NMs can be obtained with a facile method, and this research provides new insight into non-noble metal based SERS substrate.

中文翻译：

具有与贵金属相当的表面增强拉曼散射的等离子钼钨氧化物杂化物。

由于其高灵敏度和高选择性，表面增强拉曼散射（SERS）研究正在全面展开。但是，SERS性能优异的基材主要限于贵金属（Au，Ag等）。尽管SERS有源基板已扩展到半导体和过渡金属，但令人沮丧的是，它们的灵敏度不足以广泛应用。在这里，我们报告等离子钼氧化钨（MWO）杂化纳米材料（NMs），可以用作具有与贵金属相当的SERS的高性能衬底。MWO NM可以实现罗丹明6G（R6G），碱性品红（BF）和油红O（ORO）的痕量检测。R6G的检测极限浓度为10-8 M，最大增强因子高达6.09×107。优异的SERS性能归因于电磁（EM）增强机制和电荷转移（CT）机制的协同增强效果。此外，在所提出的系统中，通过使用聚乙烯吡咯烷酮（PVP）来区分EM和CT的贡献，PVP用作阻挡层，以防止CT过程从MWO NM转移到R6G。这些卓越的MWO NM可以通过简便的方法获得，这项研究为基于非贵金属的SERS基底提供了新的见识。它用作阻挡层，以防止CT过程从MWO NM到R6G。这些卓越的MWO NM可以通过一种简便的方法获得，这项研究为基于非贵金属的SERS基底提供了新的见识。它用作阻挡层，以防止CT过程从MWO NM到R6G。这些卓越的MWO NM可以通过简便的方法获得，这项研究为基于非贵金属的SERS基底提供了新的见识。

更新日期：2020-04-23

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