Fabrication of MIL-101(Cr)/silver nanocomposites as SERS substrate for sensitive determination of malachite green and crystal violet in tilapia

• Published in: Mikrochimica acta (1966) Vol. 190; no. 8; p. 282
• Main Authors: Zhao, Song-Song, Ma, Chun-Jing, Xu, Yang, Tan, Xue-Cai, Wang, Qi, Yan, Jun
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.08.2023; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Animals; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Gentian Violet; Malachite green; Metal Nanoparticles - chemistry; Microengineering; Nanochemistry; Nanocomposites; Nanocomposites - chemistry; Nanoparticles; Nanotechnology; Original Paper; Plasma resonance; Silver; Silver - chemistry; Spectrum Analysis, Raman - methods; Substrates; Tilapia; Crystal violet; SERS; MIL-101(Cr); MOF-based nanocomposite; Malachite green
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-023-05867-z

Nanocomposites with multiple functions have attracted much attention in designing novel SERS substrates. In this report, the enrichment ability of MIL-101(Cr) and the local surface plasma resonance (LSPR) of silver nanoparticles are combined to fabricate a SERS substrate denoted as MIL-101-MA@Ag, which can simultaneously produce high-density and uniformly distributed hot spots. Moreover, the enrichment ability of MIL-101(Cr) can further improve the sensitivity by concentrating and transferring the analytes in the vicinity of hot spots. Under optimal conditions, MIL-101-MA@Ag showed good SERS activity for malachite green (MG) and crystal violet (CV), with detection limits as low as 9.5×10 −11 M and 9.2×10 −12 M at 1616 cm −1 , respectively. The prepared substrate has been successfully applied to detect MG and CV in tilapia, the recovery rate of fish tissue extract was 86.4~102%, and the relative standard deviation (RSD) was 8.9~15%. The results demonstrate that MOF-based nanocomposites are expected to be useful SERS substrates and have a universal applicability for the detection of other hazardous molecules. Graphical abstract