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Plasmonic Hotspots in Air: An Omnidirectional Three‐Dimensional Platform for Stand‐Off In‐Air SERS Sensing of Airborne Species
Angewandte Chemie International Edition ( IF 16.6 ) Pub Date : 2018-04-19 , DOI: 10.1002/anie.201802214
Gia Chuong Phan-Quang 1 , Hiang Kwee Lee 1, 2 , Hao Wen Teng 1 , Charlynn Sher Lin Koh 1 , Barnabas Qinwei Yim 1 , Eddie Khay Ming Tan 3 , Wee Lee Tok 3 , In Yee Phang 2, 3 , Xing Yi Ling 1
Affiliation  

Molecular‐level airborne sensing is critical for early prevention of disasters, diseases, and terrorism. Currently, most 2D surface‐enhanced Raman spectroscopy (SERS) substrates used for air sensing have only one functional surface and exhibit poor SERS‐active depth. “Aerosolized plasmonic colloidosomes” (APCs) are introduced as airborne plasmonic hotspots for direct in‐air SERS measurements. APCs function as a macroscale 3D and omnidirectional plasmonic cloud that receives laser irradiation and emits signals in all directions. Importantly, it brings about an effective plasmonic hotspot in a length scale of approximately 2.3 cm, which affords 100‐fold higher tolerance to laser misalignment along the z‐axis compared with 2D SERS substrates. APCs exhibit an extraordinary omnidirectional property and demonstrate consistent SERS performance that is independent of the laser and analyte introductory pathway. Furthermore, the first in‐air SERS detection is demonstrated in stand‐off conditions at a distance of 200 cm, highlighting the applicability of 3D omnidirectional plasmonic clouds for remote airborne sensing in threatening or inaccessible areas.

中文翻译:

空气中的等离子热点:用于空中悬浮物种的空中SERS感知的全向三维平台

分子水平的空中感测对于早期预防灾难,疾病和恐怖主义至关重要。当前,大多数用于空气感测的2D表面增强拉曼光谱(SERS)基板仅具有一个功能表面,并且显示出较差的SERS活性深度。引入“雾化等离子体胶体”(APC)作为机载等离子体热点,用于直接在空中进行SERS测量。APC充当宏观3D和全向等离激元云,可接收激光辐射并向各个方向发射信号。重要的是,它在约2.3 cm的长度范围内产生了一个有效的等离子体热点,对于沿z轴的激光未对准提供了100倍的更高容忍度轴与2D SERS基材相比。APC具有非凡的全向特性,并显示出稳定的SERS性能,而与激光和分析物的引入途径无关。此外,在距离200 cm的对峙条件下展示了首次空中SERS检测,突显了3D全向等离激元云在威胁或无法进入的区域进行远程机载传感的适用性。
更新日期:2018-04-19
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