Ultra-Effective Methylene Blue Detection by Nanoporous Gold for Surface-Enhanced Raman Spectroscopy

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Electronic Materials Letters Pub Date : 2025-01-04 DOI:10.1007/s13391-024-00541-9

Yoonseo Huh, Sangwoo Ryu

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Abstract

This study presents the fabrication and optimization of nanoporous gold (Au) substrates for Surface-Enhanced Raman Spectroscopy (SERS). These substrates were obtained by the high-pressure thermal evaporation method, which utilizes a relatively high pressure of a few Torr to form highly porous structures. These nanoporous structures were induced by homogeneous nucleation and growth of the evaporated metal atoms that occurred through repeated collisions during the deposition process. By controlling deposition pressure and film thickness, optimal conditions to achieve enhanced SERS activity were established. The Au nanoporous structures consisted of randomly connected Au nanoparticles and demonstrated numerous nanogaps between these nanoparticles. These nanogaps act as hot spots of localized surface plasmon resonance, enabling significant amplification of Raman signals. The optimized nanoporous Au substrate, deposited at 2.0 Torr with a thickness of 1.65 μm, achieved a limit of detection (LOD) of 10^− 8 M for Rhodamine 6G (R6G). Furthermore, the substrate’s applicability was extended to the detection of methylene blue (MB), an organic dye with known environmental impacts. MB could be detected up to 10^− 6 M by using these nanoporous Au substrates for SERS. This work successfully demonstrated the potential of nanoporous Au for SERS as an effective analytical platform for trace-level detection of MB, paving the way for advancements in environmental monitoring and biological sensing applications.

Graphical Abstract

Abstract Image

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本研究介绍了用于表面增强拉曼光谱（SERS）的纳米多孔金（Au）基底的制造和优化。这些基底是通过高压热蒸发法获得的，该方法利用几托的相对高压形成高多孔结构。这些纳米多孔结构是由蒸发的金属原子在沉积过程中通过反复碰撞产生的均匀成核和生长所诱导的。通过控制沉积压力和薄膜厚度，建立了实现增强 SERS 活性的最佳条件。金纳米多孔结构由随机连接的金纳米颗粒组成，这些纳米颗粒之间有许多纳米间隙。这些纳米间隙是局部表面等离子体共振的热点，可显著放大拉曼信号。经过优化的纳米多孔金基底在 2.0 托的条件下沉积，厚度为 1.65 μm，罗丹明 6G (R6G) 的检测限 (LOD) 为 10- 8 M。此外，该基底的适用性还扩展到了亚甲基蓝（MB）的检测，亚甲基蓝是一种已知对环境有影响的有机染料。通过使用这些用于 SERS 的纳米多孔金基底，可以检测到高达 10- 6 M 的亚甲基蓝。这项工作成功证明了纳米多孔金 SERS 作为痕量甲基溴检测的有效分析平台的潜力，为环境监测和生物传感应用的进步铺平了道路。

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.