Two-Orders-of-Magnitude Enhancement of SERS Activity via a Simple Surface Engineering of Quasi-Metal Single-Crystal Frameworks.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-09-18 Epub Date: 2024-09-03 DOI:10.1021/acs.nanolett.4c03309

Xiaoyu Song, Yahui Li, Meng Yin, Wencai Yi, Wei Liu, Junfang Li, Guangcheng Xi

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Abstract

Beyond noble metals and semiconductors, quasi-metals have recently been shown to be noteworthy substrates for surface enhanced Raman spectroscopy, and their excellent quasi-metal surface-enhanced Raman spectroscopy (SERS) sensing has demonstrated a wider range of application scenarios. However, the underlying mechanism behind the enhanced Raman activity is still unclear. Here, we demonstrate that surface hydroxyls play a crucial role in the enhancement of the SERS activity of quasi-metal nanostructures. As a demonstration material, quasi-metallic MoO₂ single-crystal frameworks rich in surface hydroxyls have been shown to have 100 times higher SERS activity than MoO₂ single-crystal frameworks without hydroxyl functionalization, with a Raman enhancement factor of up to 7.6 × 10⁷. Experimental and first-principles density-functional theory calculation results show that the enhanced Raman activity can be attributed to an effective interfacial charge transfer within the MoO₂/OH/molecule system.

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通过简单的准金属单晶框架表面工程提高 SERS 活性的两个数量级。

除了贵金属和半导体之外，准金属最近也被证明是值得注意的表面增强拉曼光谱基底，其出色的准金属表面增强拉曼光谱（SERS）传感功能展示了更广泛的应用场景。然而，增强拉曼活性背后的基本机制仍不清楚。在这里，我们证明了表面羟基在增强准金属纳米结构的 SERS 活性中起着至关重要的作用。作为一种示范材料，富含表面羟基的准金属 MoO2 单晶框架的 SERS 活性比没有羟基官能化的 MoO2 单晶框架高 100 倍，拉曼增强因子高达 7.6 × 107。实验和第一原理密度泛函理论计算的结果表明，拉曼活性的增强可归因于 MoO2/羟基/分子体系内有效的界面电荷转移。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.