带有 Au Tip 和 Au@Ag Rod 的 Au@Ag Nanopencil：基于不对称蚀刻的多模态等离子体纳米探针，用于检测 SCN− 和 ClO−,Small

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带有 Au Tip 和 Au@Ag Rod 的 Au@Ag Nanopencil：基于不对称蚀刻的多模态等离子体纳米探针，用于检测 SCN− 和 ClO−
Small ( IF 13.0 ) Pub Date : 2023-05-21 , DOI: 10.1002/smll.202302302
Zhao He ₁ , Jian Zhu ₁ , Xin Li ₁ , Guo-Jun Weng ₁ , Jian-Jun Li ₁ , Jun-Wu Zhao ₁

Affiliation

在本文中，Au@Ag nanopencil 被设计为基于不对称蚀刻的多模态等离子体纳米探针，用于检测 SCN ^-和 ClO ^-。具有Au尖端和Au@Ag棒的Au@Ag纳米铅笔是在部分原电池置换和氧化还原反应的共同作用下，通过均匀生长的银包金纳米金字塔的不对称剪裁制备的。通过在不同系统中的不对称刻蚀，Au@Ag nanopencil表现出等离子体吸收带的多样化变化：SCN促进的O ₂^•−−^从末端到尖端刻蚀Au@Ag棒，引起局域表面等离子体共振的蓝移(LSPR)随着纵横比减小而达到峰值；而ClO-^可以保留Au@Ag壳，并从尖端到末端蚀刻棒内的Ag，随着耦合共振减弱，导致局域表面等离子体共振峰红移。基于不同方向的峰移，建立了SCN ^-和 ClO ^{-的多模态检测。}结果表明，SCN ^-和ClO ^-的检测限分别为160 nm 和6.7 nm，线性范围分别为1–600 µm和0.05–13 µm。精心设计的Au@Ag纳米铅笔不仅拓宽了异质结构设计的视野，而且丰富了构建多模态传感平台的策略。

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Au@Ag Nanopencil with Au Tip and Au@Ag Rod: Multimodality Plasmonic Nanoprobe based on Asymmetric Etching for the Detection of SCN− and ClO−

In this paper, Au@Ag nanopencil is designed as a multimodality plasmonic nanoprobe based on asymmetric etching for the detection of SCN⁻ and ClO⁻. Au@Ag nanopencil with Au tip and Au@Ag rod is prepared by asymmetric tailoring of uniformly grown silver-covered gold nanopyramids under the combined effect of partial galvanic replacement and redox reaction. By asymmetric etching in different systems, Au@Ag nanopencil exhibits diversified changes in the plasmonic absorption band: O₂^•− facilitated by SCN⁻ etches Au@Ag rod from the end to the tip, causing a blue shift of the localized surface plasmon resonance (LSPR) peak as the aspect ratio decreases; while the ClO⁻ can retain Au@Ag shell and etch Ag within rod from the tip to the end, causing a redshift of the LSPR peak as the coupling resonance weakens. Based on peak shifts in different directions, a multimodality detection of SCN⁻ and ClO⁻ has been established. The results demonstrate the detection limits of SCN⁻ and ClO⁻ are 160 and 6.7 nm, and the linear ranges are 1–600 µm and 0.05–13 µm, respectively. The finely designed Au@Ag nanopencil not only broadens the horizon of designing heterogeneous structures, but also enriches the strategy of constructing multimodality sensing platform.

更新日期：2023-05-21

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