Journal
NANO-MICRO LETTERS
Volume 13, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00620-8
Keywords
SERS; SARS-CoV-2; Human ACE2; Virus-trap nanostructure; Single-virus detection
Funding
- National Natural Science Foundation of China [51471182]
- Shanghai international science and Technology Cooperation Fund [17520711700]
- National Key Research and Development Project [2017YFB0310600]
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The study presents a highly sensitive SERS biosensor based on a Human ACE2-functionalized gold virus traps nanostructure for selective capture and rapid detection of S-protein expressed coronavirus, such as the current SARS-CoV-2, down to the single-virus level.
The current COVID-19 pandemic urges the extremely sensitive and prompt detection of SARS-CoV-2 virus. Here, we present a Human Angiotensin-converting-enzyme 2 (ACE2)-functionalized gold virus traps nanostructure as an extremely sensitive SERS biosensor, to selectively capture and rapidly detect S-protein expressed coronavirus, such as the current SARS-CoV-2 in the contaminated water, down to the single-virus level. Such a SERS sensor features extraordinary 10(6)-fold virus enrichment originating from high-affinity of ACE2 with S protein as well as virus-traps composed of oblique gold nanoneedles, and 10(9)-fold enhancement of Raman signals originating from multi-component SERS effects. Furthermore, the identification standard of virus signals is established by machine-learning and identification techniques, resulting in an especially low detection limit of 80 copies mL(-1) for the simulated contaminated water by SARS-CoV-2 virus with complex circumstance as short as 5 min, which is of great significance for achieving real-time monitoring and early warning of coronavirus. Moreover, here-developed method can be used to establish the identification standard for future unknown coronavirus, and immediately enable extremely sensitive and rapid detection of novel virus.
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