ZIF-8-modified Au–Ag/Si nanoporous pillar array for active capture and ultrasensitive SERS-based detection of pentachlorophenol. Issue 32 (6th August 2020)

• Record Type: Journal Article
• Authors: Yan, Lingling; Yang, Peng; Cai, Hongxin; Chen, Liang; Wang, Yongqiang; Li, Ming
• Is Part Of: Analytical methods. Volume 12:Issue 32(2020)
• Page Start: 4064
• Page End: 4071
• Publication Date: 2020-08-06
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d0ay00388c
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A novel SERS substrate based on a zeolitic imidazolate framework-8 (ZIF-8) film-modified Au–Ag/Si nanoporous pillar array (ZIF-8/Au–Ag/Si-NPA) was successfully fabricated for pentachlorophenol (PCP) detection. Abstract : A novel SERS substrate based on a zeolitic imidazolate framework-8 (ZIF-8) film-modified Au–Ag/Si nanoporous pillar array (ZIF-8/Au–Ag/Si-NPA) was successfully fabricated for pentachlorophenol (PCP) detection. The Au–Ag/Si-NPA was synthesized through immersion plating and replacement reaction on the Si-NPA, which was prepared by the hydrothermal etching. The ZIF-8 film was coated via layer-by-layer growth technique. The ZIF-8 film is nanoporous and its thickness can be controlled by varying the growing number, which can significantly influence the SERS performance of the substrate. The substrate with optimal ZIF-8 thickness exhibited an excellent SERS response to PCP molecules. The SERS enhancement factor reached up to 1.8 × 10 7 and the detection limit was down to 10 −13 M. Moreover, the substrate showed good uniformity with a relative standard deviation (RSD) of 8.7% and good selectivity. The PCP detection is hardly interfered by the coexisting organic compounds. The high SERS performance may be due to the enrichment effect of the ZIF-8 film. The ZIF-8 film could capture and enrich the trace PCP molecules by electrostatic interaction between the negatively charged PCP − and the positively charged ZIF-8. This work suggests that the ZIF-8/Au–Ag/Si-NPA substrate has potential application in SERS analysis of the polar organic pollutant detection in environmental media.