Hierarchical Nanoporous Copper Fabricated by One‐Step Dealloying Toward Ultrasensitive Surface‐Enhanced Raman Sensing,Advanced Materials Interfaces

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Hierarchical Nanoporous Copper Fabricated by One‐Step Dealloying Toward Ultrasensitive Surface‐Enhanced Raman Sensing
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-06-19 , DOI: 10.1002/admi.201800332
Ruirui Song _{1,

2} , Ling Zhang ₁ , Fan Zhu ₃ , Wei Li ₁ , Zhenchuang Fu ₂ , Bin Chen ₃ , Mingwei Chen ₃ , Heping Zeng ₁ , Deng Pan ₄

Affiliation

Geometry‐tunable substrates with abundant plasmon resonant structure are ideal to proffer high surface‐enhanced Raman scattering (SERS) activity for trace sensing including pollutants and toxics, whereas great challenge remains in creating high‐density “hotspots” in these structures for further improving Raman signals and detection sensitivity. Herein, one‐step dealloying strategy is proposed to fabricate free‐standing copper membranes with hierarchical porous architecture where a high density of inherent “hotspots” is built in the vicinity of secondary pores in 3D ligaments. The hierarchical nanoporous copper shows excellent SERS activity with an average enhancement factor of 6.4 × 10⁹, originating from strong electromagnetic coupling effects induced by its highly dense “hotspots” and highly accessible surface. Moreover, the proposed one‐step dealloying strategy of dual‐phase binary alloys propounds an inexpensive yet effective route to construct ultrasensitive SERS substrate for trace detection and molecular diagnosis.

中文翻译：

通过一步脱合金制备超敏感表面增强拉曼传感的多层纳米多孔铜

具有丰富的等离振子共振结构的可几何调整的基板非常适合提供高表面增强拉曼散射（SERS）活性以进行痕量感测，包括污染物和有毒物质，而在这些结构中创建高密度“热点”以进一步改善拉曼方面仍然面临巨大挑战信号和检测灵敏度。本文提出了一种单步脱合金策略，以制造具有分层多孔结构的独立式铜膜，其中在3D韧带的次级孔附近建立了高密度的固有“热点”。分层的纳米多孔铜表现出出色的SERS活性，平均增强因子为6.4×10 ⁹源自其高度密集的“热点”和高度可接近的表面所引起的强电磁耦合效应。此外，提出的双相二元合金的一步脱合金策略提出了一种廉价而有效的途径来构建用于痕量检测和分子诊断的超灵敏SERS基底。

更新日期：2018-06-19

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