Microporous Oxide-Based Surface-Enhanced Raman Scattering Film for Quadrillionth Detection of Mercury Ion (II)

Abstract

A variety of chemical sensing materials and procedures for conveniently detecting mercuric ion (II) (Hg2+) have been extensively explored. The detection challenges for accomplishing a simple, fast, and low investment procedure at the ultrasensitive level are ongoing. Herein we report a quadrillionth level for detecting Hg2+ by the surface-enhanced Raman scattering (SERS) technique. There is an interaction of silver nanoparticles decorated on a zinc-oxide tetrapod structure and coated on FTO glass (Ag@ZnO-FTO) with an organic ligand. 4,4′-Dipyridyl (DPy) performed as being chemisorbed by Ag nanoparticles interacting with a pyridine ring to produce plasmonic hot spots for SERS. The morphology of the surface and porous structure of the tetrapod becomes the powerful platform for enhanced SERS performance of DPy detection. In the absence of the augmentative electrolyte, the enhancement factor for DPy is more than 107. The inhibiting of the aggregation between Ag and DPy was present following the appearance of Hg2+, demonstrated by the quenching of the SERS signal from the DPy molecules. The capability to reproduce and the selectivity of the sensing by DPy were both demonstrated. In addition, the applications for detecting Hg2+ in natural water and beverages were successfully detected. These results demonstrated the SERS sensors had the potential for detecting Hg2+ in practical use.

Development of a Novel H-Shaped Electrochemical Aptasensor for Detection of Hg2+ Based on Graphene Aerogels–Au Nanoparticles Composite

“…Although traditional methods for detecting Hg 2+ , such as atomic absorption spectroscopy (AAS) [4], surface-enhanced Raman scattering (SERS) [5], inductively coupled plasma mass spectrometry (ICP-MS) [6], and atomic fluorescence spectroscopy (AFS) [7] offer high sensitivity and efficiency, they are associated with expensive equipment, welltrained operators, and lengthy preprocessing times [8]. In recent years, many colorimetric [9], fluorescent [10], and electrochemical sensors have been developed as effective tools for Hg 2+ detection [11].…”

Irradiation-Induced Synthesis of Ag/ZnO Nanostructures as Surface-Enhanced Raman Scattering Sensors for Sensitive Detection of the Pesticide Acetamiprid

“…Irradiation is a convenient method for the synthesis of controllable Ag nanostructures on SERS chips. An SPR-mediated collective oscillation of transfer electrons can be produced on the Ag NP surface, causing an improved electric field to be generated locally [32]. We use 4,4 -dipyridyl (DPY) to determine the parameters of the irradiation time because DPY and acetamiprid have SERS-sensitive pyridine functional groups, and the SERS effect of DPY on Ag@ZnO has been extensively investigated [33].…”

Copper Oxide Decorated Zinc Oxide Nanostructures for the Production of a Non-Enzymatic Glucose Sensor

“…Among them, ZnO nanostructures are also divided into various shapes such as nanowires [25], nanorods [24], nano-pillars [26], and tetrapod nanostructures [27]. In addition, the hybrid structure of zinc oxide and other materials is more helpful to improve its corresponding application characteristics, such as hybrid structures of wool-ball-like ZnO with carbon nanotubes [28], honeycomb-like ZnO with multiwalled carbon nanotube [29], and hollow ZnO nanostructures with ZnCo 2 O 4 for gas sensing [30]; the hybrid structures of zinc oxide nanoparticle and graphene for photocatalysis [31]; the hybrid structures of hierarchical ZnO nanostructures and silver nanoparticle for surface-enhanced Raman scattering [32,33]. In this study, ZnO tetrapod nanostructures were unitized to provide a template for the electrode because of their four-pillar structure with a larger scale than other structures [34,35].…”