Journal
JOURNAL OF MATERIALS SCIENCE
Volume 55, Issue 21, Pages 8868-8880Publisher
SPRINGER
DOI: 10.1007/s10853-020-04669-5
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Funding
- National Natural Science Funding of China [61704095]
- Natural Science Foundation of Zhejiang Province [LY19F050002]
- Natural Science Funding of Ningbo [2019A610058]
- K.C. Wong Magna Fund in Ningbo University
- European Union [798916]
- Marie Curie Actions (MSCA) [798916] Funding Source: Marie Curie Actions (MSCA)
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Surface-enhanced Raman scattering (SERS) technique is a powerful spectrum analysis technique for the ultra-low molecular trace detection. Conventionally, noble metals like silver (Ag) and gold (Au) are used to prepare the SERS substrates; however, limitations of complicated experimental designs and sophisticated process steps impede their wide applications in practice. Recently, metal oxides arise as a promising material for SERS application, but relatively weak Raman signal enhancement and poor material stability still pose as a challenge. Here, a UV-light-assisted fabrication of MoO3-x/silver nanoparticles (MoO3-x/Ag NPs) film is proposed. In the experiment, the sub-transition-metal-oxide of MoO3-x was used as the Raman chemical enhancement substrate as well as the reducing agent. Through the spin-coating of MoO3-x layer on the silicon substrate and UV-light-assisted reduction of silver nitride (AgNO3) on the MoO3-x layer, a novel MoO3-x/Ag NPs one-layer film was fabricated. Using the Rhodamine B (RhB) as the Raman reporter, SERS measurement shows that enhancement factor (EF) of 1.195 x 10(6) could be achieved. Moreover, a Raman signal amplifying strategy is further demonstrated by constructing MoO3-x/Ag NPs multi-layer films. And result evidences that maximum gain of 2.07 for the RhB Raman peak at 1280 cm(-1) can be obtained on the MoO3-x/Ag NPs three-layer film when referred to that on the MoO3-x/Ag NPs one-layer film. Meanwhile, the EF of the MoO3-x/Ag NPs three-layer film is also improved to 2.985 x 10(6), giving the minimum detectable concentration of 10(-9) M.
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