The Design of WTe2/Graphene/Ag NPs Heterostructure for the Improvement of the Chemical Enhancement in SERS

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2024-11-20 DOI:10.1021/acs.nanolett.4c04339

Tianyu Sun, Yang Wu, Heqi Ma, Chao Zhang, Chonghui Li, Baoyuan Man, Cheng Yang, Zhen Li

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Abstract

Combining the advantages of metal and two-dimensional (2D) nanomaterials, various 2D/metal composite structures are proposed as surface-enhanced Raman spectroscopy (SERS) substrates. However, the chemical enhancement in the composite structure is usually less responsible for the total enhancement. In this work, we proposed a heterostructure including WTe₂/graphene/Ag nanoparticles (WTe₂/Gr/Ag) as an effective platform for SERS. The matching of energy levels facilitates charge transfer (CT) within the composite structure, which in turn significantly improves the chemical enhancement of SERS. Compared with WTe₂/Ag or Gr/Ag substrate, the SERS signals can be amplified up to 18-fold, and the detection limit could further reduce 3 orders of magnitude. Furthermore, the CT process in the SERS test can be further promoted after introducing the pyroelectric field based on the ferro-electricity of WTe₂. The enhancement factor of the WTe₂/Gr/Ag substrate finally reached 1.34 × 10¹². This work proposes a new idea for the design of highly sensitive SERS sensors.

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设计 WTe2/Graphene/Ag NPs 异质结构以提高 SERS 的化学增强效果

结合金属和二维（2D）纳米材料的优势，人们提出了各种 2D/金属复合结构作为表面增强拉曼光谱（SERS）基底。然而，复合结构中的化学增强通常对总体增强作用较小。在这项工作中，我们提出了一种包括 WTe2/石墨烯/银纳米颗粒（WTe2/Gr/Ag）的异质结构，作为 SERS 的有效平台。能级的匹配促进了复合结构内的电荷转移（CT），从而显著提高了 SERS 的化学增强效果。与 WTe2/Ag 或 Gr/Ag 基底相比，SERS 信号最多可放大 18 倍，检测限可进一步降低 3 个数量级。此外，根据 WTe2 的铁电性引入热电场后，还能进一步促进 SERS 测试中的 CT 过程。WTe2/Gr/Ag 衬底的增强因子最终达到了 1.34 × 1012。这项工作为高灵敏度 SERS 传感器的设计提出了新的思路。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.