Magnetic Micromotors with Spiky Gold Nanoshells as SERS Sensors for Thiram and Bacteria Detection,Small

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Magnetic Micromotors with Spiky Gold Nanoshells as SERS Sensors for Thiram and Bacteria Detection
Small ( IF 13.0 ) Pub Date : 2024-09-10 , DOI: 10.1002/smll.202405193
Tao Yang ₁ , Jianping Zhou ₁ , Yongkang Wang ₁ , Ben Fan ₁ , Jing Qiao ₁ , Lixiang Chen ₁ , Xiaoyu Wang ₁ , Lingxiang Guo ₁ , Hong Yang ₁ , Quan Li _{1,

2}

Affiliation

Surface-enhanced Raman scattering (SERS) is widely used in all kinds of detection due to its ultrahigh sensitivity and selectivity. Micromotors, when used as SERS sensors, or the so-called “hotspots on the fly”, can combine both controlled mobility and SERS sensing capacity, and are ideal for versatile in situ detection. In this work, mobile SERS sensors are successfully fabricated by growing gold nanospikes onto magnetic microsphere surfaces. These mobile micromotors can act as normal SERS sensors, characterized by the trace detection of thiram, a highly toxic fungicide. The detection limit can reach 0.1 nM, as good as most other noble metal deposited substrates. With significant magnetic gradient forces, separation of pathogenic bacteria from bulk solution is achieved once these magnetic micromotors bind with bacterial cells. Manipulated propulsion of micromotors, on the other hand, enables them to approach and contact pathogenic bacterial cells on command and further acquire Raman spectra under a controlled degree of contact, a capability never seen with passive sensors. The robotic SERS sensors have demonstrated unique sensing characteristics with controlled manipulations along with discriminative detection between bacterial species.

中文翻译：

带有尖刺金纳米壳的磁性微电机作为 SERS 传感器用于 Thiram 和细菌检测

表面增强拉曼散射（SERS）因其超高的灵敏度和选择性而被广泛用于各种检测中。当微电机用作 SERS 传感器或所谓的“动态热点”时，可以结合受控移动性和 SERS 传感能力，是多功能原位检测的理想选择。在这项工作中，通过在磁性微球表面生长金纳米尖刺，成功制造了移动式 SERS 传感器。这些移动微电机可以充当普通的 SERS 传感器，其特征是痕量检测 thiram，一种剧毒的杀菌剂。检测限可达 0.1 nM，与大多数其他贵金属沉积基板一样好。在显著的磁梯度力下，一旦这些磁性微电机与细菌细胞结合，就可以实现病原菌与本体溶液的分离。另一方面，微电机的操纵推进使它们能够根据命令接近和接触病原菌细胞，并在受控接触度下进一步获取拉曼光谱，这是无源传感器从未见过的能力。机器人 SERS 传感器通过受控操作以及细菌种类之间的鉴别检测展示了独特的传感特性。

更新日期：2024-09-10

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