Abstract
Over the last few decades, benefitting from the sufficient sensitivity, high specificity, nondestructive, and rapid detection capability of the surface-enhanced Raman scattering (SERS) technique, numerous nanostructures have been elaborately designed and successfully synthesized as high-performance SERS substrates, which have been extensively exploited for the identification of chemical and biological analytes. Among these, Ag nanorods coated with thin metal oxide layers (AgNRs-oxide hybrid array substrates) featuring many outstanding advantages have been proposed as fascinating SERS substrates, and are of particular research interest. The present review provides a systematic overview towards the representative achievements of AgNRs-oxide hybrid array substrates for SERS applications from diverse perspectives, so as to promote the realization of real-world SERS sensors. First, various fabrication approaches of AgNRs-oxide nanostructures are introduced, which are followed by a discussion on the novel merits of AgNRs-oxide arrays, such as superior SERS sensitivity and reproducibility, high thermal stability, long-term activity in air, corrosion resistivity, and intense chemisorption of target molecules. Next, we present recent advances of AgNRs-oxide substrates in terms of practical applications. Intriguingly, the recyclability, qualitative and quantitative analyses, as well as vapor-phase molecule sensing have been achieved on these nanocomposites. We further discuss the major challenges and prospects of AgNRs-oxide substrates for future SERS developments, aiming to expand the versatility of SERS technique.
Highlights
Since the discovery of surface-enhanced Raman scattering (SERS) in the 1970’s [1], this vibration spectroscopic phenomenon has attracted enormous attention both in experimental study [2,3,4]and theoretical calculation [5,6,7]
Ag nanorods (AgNRs) arrays with oxide layers might besensors effective both to address this highly demanded the thermal stability of AgNRs-based in morphology to change aillustrated very low temperature of 50the
We explore the renewability of AgNRs-HfO2 arrays during gas recognition, i.e., after SERS measurement, the substrate is heated on a hot plate at 250 ◦ C for 30 s gas recognition, i.e., after SERS measurement, the substrate is heated on a hot plate at 250 °C for 30 s to desorb molecules
Summary
Since the discovery of surface-enhanced Raman scattering (SERS) in the 1970’s [1], this vibration spectroscopic phenomenon has attracted enormous attention both in experimental study [2,3,4]. The high costs of SERS detections based on Ag nanostructures restrict the universality of the SERS technique To overcome these inevitable limitations, covering AgNR arrays with thin metal oxide layers has been proposed as a strategy to solve the above problems [49,50,56,57,58,59,60,61]. Taking advantages of the excellent stability and multi-functions of oxide layers, AgNRs-oxide hybrid array substrates provide superior SERS sensitivity and reproducibility, high thermal stability, long-term activity in air, corrosion resistivity, and intense chemisorption of target molecules These advantages contribute to recyclable and cost-effective SERS substrates for both qualitative and quantitative analyses. We further discuss the major challenges and prospects of AgNRs-oxide substrates for future SERS developments
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