4.7 Article

Spontaneous synthesis of Ag nanoparticles decorated ZnAl layered double hydroxides for synergistically improved SERS activity

Journal

APPLIED SURFACE SCIENCE
Volume 612, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.apsusc.2022.155701

Keywords

Layered double hydroxides; Silver nanoparticles; SERS; Charge transfer; Hybrids

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This study successfully fabricated Ag nanoparticles decorated ZnAl LDHs nanosheets and investigated their SERS performance. Experimental results demonstrated the influence of LDH structure and oxygen vacancies concentration of Ag-ZnAl hybrid on SERS performance.
Surface enhanced Raman spectroscopy (SERS) is a rapid and ultrasensitive analytical technique. For practical applications, it is highly desirable to explore metal/semiconductor hybrid substrates, which utilize the synergistic enhancement effects of plasmons and charge transfer (CT). Herein, we successfully fabricated Ag nanoparticles decorated ZnAl LDHs nanosheets (Ag-ZnAl) by a facile one-pot solvothermal growth method and investigated the SERS performance. When 4-nitrobenzenethiol (4-NBT) was used as the probe molecule, the detection limit reaches as low as 1 x 10(-)(10) M and the enhancement factor is 1.7 x 10(5). A systematic experimental study revealed that the unique structure of LDH facilitates formation of densely distributed Ag NPs with good dispersibility, providing abundant hot spots for electromagnetic enhancement. Moreover, Ag-ZnAl hybrid has a higher concentration of oxygen vacancies, which can promote photo-induced CT for chemical enhancement. Furthermore, first principles calculations demonstrated that Ag-ZnAl hybrid has improved adsorption ability of 4-NBT through the formation of Ag-S and N-O-H bonds, which can facilitate charge transfer process and increase Raman intensity of 4-NBT. This work provides an effective strategy to design easy-to-fabricated metal/semiconductor hybrids as SERS sensing platform.

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