Hefei Research Institute Introduces Upconversion Luminescent Materials to Surface Enhanced Raman Spectroscopy

Hefei Research Institute Introduces Upconversion Luminescent Materials to Surface Enhanced Raman Spectroscopy

Recently, Yang Liangbao, a researcher of the Liu Jinhuai Research Group of the Institute of Intelligent Machinery of the Chinese Academy of Sciences' Hefei Institute of Material Science, introduced an up-conversion luminescent material to surface-enhanced Raman spectroscopy (SERS) to achieve high sensitivity under long-wavelength, low-energy lasers. SERS detection has very important significance for the application of SERS technology to actual detection. The relevant results have been published in Materials Chemistry A and Analyst Magazine of the Royal Society of Chemistry (J. Mater. Chem. A, 2015, DOI: 10.1039/C5TA03143E, Analyst, 2015, DOI: 10.1039/C5AN00441A).

In recent years, SERS technology has been drawing attention since it can perform non-destructive, highly sensitive fingerprint recognition detection, and has been widely used in various basic research fields. However, how to develop a SERS substrate to better apply it to actual detection and monitoring is still a great challenge.

In response to the above problems, Liu Honglin and other researchers synthesized the up-conversion materials and noble metal composite materials NaYF4:Yb,Er@Ag and NaYF4:Yb,Er@SiO2@Ag through a simple method. Using the upconversion materials NaYF4:Yb, Er to convert near-infrared light into common visible light, ultra-sensitive SERS detection and surface plasmon-catalyzed reactions under near-infrared laser are realized, and a series of comparative experiments are used to elucidate the near-infrared laser composite SERS. The mechanism of sensitive detection of the substrate. The researchers obtained another composite SERS substrate (NaYF4:Yb, Tm@TiO2@Ag) by changing the emission center of the upconversion material, and successfully achieved the photocatalytic degradation behavior of titanium dioxide under non-UV light. Simultaneous use of SERS technology to monitor the photodegradation reaction process of photocatalysts under different wavelengths of monochromatic laser light provides direct evidence for the photocatalytic degradation of NaYF4:Yb, Tm@TiO2@Ag in non-UV light, and also provides for SERS applications. New direction.

The research work was supported by the national special scientific equipment development special task, the national major scientific research plan nanometer special project and the National Natural Science Fund.

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