Metal-Organic Polyhedra-Coated Si Nanowires for the Sensitive Detection of Trace Explosives
Metal-Organic Polyhedra-Coated Si Nanowires for the Sensitive Detection of Trace Explosives
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DOI：
10.1021/acs.nanolett.6b02360
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发表时间：
2017-01-01
期刊：
影响因子：
10.8
通讯作者：
de Smet, Louis C. P. M.
中科院分区：
文献类型：
--
作者：
Cao, Anping;Zhu, Wei;de Smet, Louis C. P. M.
表面改性硅纳米线场效应晶体管 (SiNW-FET) 已被证明是微型传感器中分子识别的一个有前途的平台。在这项工作中，我们提出了一种新型 nanoFET 器件，用于基于金属有机多面体 (MOP) 亲和层对爆炸物进行灵敏和选择性检测。明智地选择嵌入 MOP 笼内的组装单元（有机配体和不饱和金属位点）的几何和电子特性，可以形成多重电荷转移（CT）相互作用，从而促进选择性爆炸夹杂。同时，笼内的主体稳定的CT复合物充当有效的分子门控元件，强烈调节硅纳米线的电导率。通过将 MOP 笼接枝到 SiNW-FET 器件上，所得传感器对各种爆炸物，特别是 4,6-三硝基甲苯 (TNT) 表现出良好的电传感能力，检测限低于纳摩尔水平。重要的是，将具有可调结构和性能的 MOP 与基于 SiNW 的器件耦合可能为广泛的传感应用开辟新途径，解决各种目标分析物的问题。
Surface-modified silicon nano-wire-based field-effect transistors (SiNW-FETs) have proven to be a promising platform for molecular recognition in miniature sensors. In this work, we present a novel nanoFET device for the sensitive and selective detection of explosives based on affinity layers of metal-organic polyhedra (MOPs). The judicious selection of the geometric and electronic characteristics of the assembly units (organic ligands and unsaturated metal site) embedded within the MOP cage allowed for the formation of multiple charge-transfer (CT) interactions to facilitate the selective explosive inclusion. Meanwhile, the host-stabilized CT complex inside the cage acted as an effective molecular gating element to strongly modulate the electrical conductance of the silicon nanowires. By grafting the MOP cages onto, a SiNW-FET device, the resulting sensor showed a good electrical sensing capability to various, explosives, especially,4,6-trinitrotoluene (TNT), with a detection limit below the nanomolar level. Importantly, coupling MOPs which have tunable structures and properties to SiNW-based devices may open up new avenues for a wide range of sensing applications, addressing various target analytes.