Buoyant particulate strategy for few-to-single particle-based plasmonic enhanced nanosensors

Dongjie Zhang, Leqin Peng, Xinglong Shang, Wenxiu Zheng, Hongjun You, Teng Xu, Bo Ma, Bin Ren () and Jixiang Fang ()
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Dongjie Zhang: Xi’an Jiaotong University
Leqin Peng: Xi’an Jiaotong University
Xinglong Shang: Xi’an Jiaotong University
Wenxiu Zheng: Xi’an Jiaotong University
Hongjun You: Xi’an Jiaotong University
Teng Xu: Chinese Academy of Sciences
Bo Ma: Chinese Academy of Sciences
Bin Ren: Xiamen University
Jixiang Fang: Xi’an Jiaotong University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Detecting matter at a single-molecule level is the ultimate target in many branches of study. Nanosensors based on plasmonics have garnered significant interest owing to their ultrahigh sensitivity even at single-molecule level. However, currently, plasmonic-enhanced nanosensors have not achieved excellent performances in practical applications and their detection at femtomolar or attomolar concentrations remains highly challenging. Here we show a plasmonic sensing strategy, called buoyant plasmonic-particulate-based few-to-single particle-nanosensors. Large-sized floating particles combined with a slippery surface may prevent the coffee-ring effect and enhance the spatial enrichment capability of the analyte in plasmonic sensitive sites via the aggregation and lifting effect. Dimer and single particle-nanosensors demonstrate an enhanced surface-enhanced Raman spectroscopy (SERS) and a high fluorescence sensitivity with an enrichment factor up to an order of ∼104 and the limit of detection of CV molecules down to femto- or attomolar levels. The current buoyant particulate strategy can be exploited in a wide range of plasmonic enhanced sensing applications for a cost-effective, simple, fast, flexible, and portable detection.

Date: 2020
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DOI: 10.1038/s41467-020-16329-y

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