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Hefei Research Institute builds a surface-enhanced Raman spectrum single-hot spot amplifier
[Chinese instrument network instrument R&D] Recently, Yang Liangbao, a researcher at the Institute of Intelligent Machinery of the Chinese Academy of Sciences' Hefei Institute of Physical Science, used spontaneous capillary forces to capture nanoparticles and built a single-hot-spot amplifier consisting of a single silver nanowire and a single gold nanoparticle. Highly stable and ultra sensitive detection of surface-enhanced Raman spectroscopy (SERS) is achieved.
The related work was titled A capillary force-induced Au nanoparticle-Ag nanowire single hot spot platform for SERS analysis, and published as a cover article in Journal of Materials Chemistry C (J. Mater. Chem. C., 2017, 5, 3229-3237). ) Magazine, highly praised by peers and magazine editors.
Surface-enhanced Raman spectroscopy (SERS) has been widely used in various fields because of its unique molecular fingerprint information and superior detection sensitivity. However, SERS hotspots have always been plagued by tedious and inconsistent methods. Therefore, how to simply construct a uniform and reliable SERS hotspot is a goal people have been pursuing.
Based on this goal, Yang Liangbao et al. used a common capillary force to construct a point-single-hot spot amplifier composed of nanowires and nanoparticles. Nanoparticles are trapped on the surface of the nanowires within the capillary force range, so the coupled nanowires and nanoparticles generate a large electromagnetic field enhancement; secondly, the pores formed by the coupling of nanoparticles and nanowires can be captured spontaneously by the capillary force to be measured. The object enters a hot spot, which in turn amplifies the Raman signal of the object under test in the hot spot. Both the experimental and theoretical results show that the single hot spot structure constructed by capillary force can amplify the signal of the analyte, and the difference in the position of the particles captured by the capillary force has little effect on the electromagnetic field distribution. The research work uses capillary force to construct single-hot spot amplifiers, which not only avoids the problem of non-uniform SERS hot spots caused by particle agglomeration, but also solves the problem of signal interference caused by the use of thiol-based polymers for substrate assembly.
The above research work has been supported by the National Natural Science Foundation of China (21571180, 21505138) and the Postdoctoral Science Foundation Hefei Research Institute to build a surface-enhanced Raman spectroscopy single-hot spot amplifier (2016T90590).
(Original Title: Hefei Research Institute builds a surface-enhanced Raman spectrum single-hot spot amplifier)