Trace Cd2+ Ions Detection on the Flower-Like Ag@CuO Substrate

Abstract

CuO flower-like material (FM) was prepared via the facile hydrothermal method, and Ag nanoparticles were deposited on the CuO FM to obtain Ag@CuO composite. Rhodamine 6G (R6G) was used as the probe molecule on Ag@CuO FM substrate to study surface enhanced Raman scattering (SERS). It is discovered that it exhibited an excellent SERS performance with limit of detection of 3.58 × 10−16 M and enhancement factor (EF) of 3.99 × 1010. More importantly, we used it as a SERS substrate to detect cadmium ions and found that its limit of detection (LOD) reaches up to 2.6 × 10−8 M, which is lower than the highest allowable Cd2+ concentration in drinking water set by the World Health Organization (WHO) and Environmental Protection Agency (EPA). Therefore, the proposed composite can be applicable to the detection of Cd2+ in drinking water and in soil.

Innovative Application of SERS in Food Quality and Safety: A Brief Review of Recent Trends

“…Label-free and label-based methods are suitable for detection, similar to other general chemical contaminants. For the label-free method, semiconductor substrates are prepared using metal oxides, which absorb metal cations [ 43 , 44 ]. For label-based methods, the formation of specific chemical bonds with heavy metal ions or extrinsic SERS probes are required for SERS detection.…”

A Novel SERS Substrate Based on Discarded Oyster Shells for Rapid Detection of Organophosphorus Pesticide

“…The strong adhesion of the PDA layer provided a uniform and well-packed composite system [17]. Simultaneously, in-situ preparation of Ag NPs and, thus, effective charge redistributions among Ag NPs and CaO, via a conducting PDA layer to induce a chemical effect during the SERS measurement, was obtained [18]. In our previous work, the Ag/CuO nanocomposite demonstrated an approximately 10 5 times SERS signal enhancement, mainly through the combination of CT and EM mechanisms [19].…”