Active site-dominated electromagnetic enhancement of surface-enhanced Raman spectroscopy (SERS) on a Cu triangle plate

Li, Chang; Chen, M.

doi:10.1039/d0ra08477h

Cited by 10 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In most cases, the peak intensity varies linearly with the concentrations. The observed dependency of log concentration vs log intensity suggests a Freundlich-typed adsorption of creatinine on the substrates. − This means that hot spots with different binding affinities exist in the currently developed SERS substrates. We believe that silver nanoflowers with a high surface area as well as the contributions from exposed underlying Cu contribute to this adsorption behavior.…”

Section: Resultsmentioning

confidence: 99%

Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

Sajitha

Abraham

Nelliyil

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Solid-state surface-enhanced Raman spectroscopic (SERS) substrates surmount the limitations of colloidal nanoparticles for many practical chemical and biomolecular sensors. The main bottom-up approaches adopted for SERS substrate fabrication include preparing plasmonic nanoparticles and their deposition to selected surfaces via chemical self-assembly, inkjet printing, spray coating, dip-coating, etc. In contrast, the top-down strategy is to create nanostructures on surfaces via different lithographic techniques (nanoimprint lithography, electron beam lithography), laser ablation, or chemical etching and then depositing a nanolayer of coinage metals. The ease and reproducibility of production, high enhancement, and uniformity of performance are the requirements for a reliable SERS substrate. This work describes an easy process for preparing SERS substrates from a less expensive and readily available material, brass. The treatment of brass with hydrochloric acid caused preferential etching of Zn from the surface, leaving a uniform Cu nanoporous substrate (Cu NPS ). The subsequent galvanic displacement of Cu NPS with AgNO 3 resulted in silver nanocrystal overgrowth, as evidenced by microscopic, spectroscopic, and elemental studies. The corresponding SERS studies with 4-mercaptophenylboronic acid (4-MPBA) as the probe molecule revealed ∼30 and ∼300 times improved performance compared to Cu NPS and the parent brass substrates, respectively. Further, we explored the possibility of sensing creatinine, the biomarker for kidney functioning. Creatinine followed a Freundlich type adsorption, and the SERS substrate developed herein exhibited a sensitivity down to 1.7 pg/mL.

show abstract

Section: Resultsmentioning

confidence: 99%

Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

Sajitha

Abraham

Nelliyil

et al. 2021

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…As it was illustrated in the previous sections, SERS substrates are generally made of noble metals (e.g., Au, Ag, Cu) due to their high plasmonic efficiency [ 158 , 160 , 162 , 164 , 167 , 168 , 169 , 176 , 207 , 234 , 235 ]. However, the costly preparation and disposable issues of these substrates obstruct the universality of SERS measurements [ 189 ].…”

Section: Other Metals and Alloysmentioning

confidence: 99%

Trends in Application of SERS Substrates beyond Ag and Au, and Their Role in Bioanalysis

et al. 2022

View full text Add to dashboard Cite

This article compares the applications of traditional gold and silver-based SERS substrates and less conventional (Pd/Pt, Cu, Al, Si-based) SERS substrates, focusing on sensing, biosensing, and clinical analysis. In recent decades plethora of new biosensing and clinical SERS applications have fueled the search for more cost-effective, scalable, and stable substrates since traditional gold and silver-based substrates are quite expensive, prone to corrosion, contamination and non-specific binding, particularly by S-containing compounds. Following that, we briefly described our experimental experience with Si and Al-based SERS substrates and systematically analyzed the literature on SERS on substrate materials such as Pd/Pt, Cu, Al, and Si. We tabulated and discussed figures of merit such as enhancement factor (EF) and limit of detection (LOD) from analytical applications of these substrates. The results of the comparison showed that Pd/Pt substrates are not practical due to their high cost; Cu-based substrates are less stable and produce lower signal enhancement. Si and Al-based substrates showed promising results, particularly in combination with gold and silver nanostructures since they could produce comparable EFs and LODs as conventional substrates. In addition, their stability and relatively low cost make them viable alternatives for gold and silver-based substrates. Finally, this review highlighted and compared the clinical performance of non-traditional SERS substrates and traditional gold and silver SERS substrates. We discovered that if we take the average sensitivity, specificity, and accuracy of clinical SERS assays reported in the literature, those parameters, particularly accuracy (93–94%), are similar for SERS bioassays on AgNP@Al, Si-based, Au-based, and Ag-based substrates. We hope that this review will encourage research into SERS biosensing on aluminum, silicon, and some other substrates. These Al and Si based substrates may respond efficiently to the major challenges to the SERS practical application. For instance, they may be not only less expensive, e.g., Al foil, but also in some cases more selective and sometimes more reproducible, when compared to gold-only or silver-only based SERS substrates. Overall, it may result in a greater diversity of applicable SERS substrates, allowing for better optimization and selection of the SERS substrate for a specific sensing/biosensing or clinical application.

show abstract

“…The hollow structure of noble metal is superior to that of solid hollow structure with the same morphology due to the plasma field coupling between its inner and outer surfaces, which generates more electromagnetic field hot spots [26]. Li et al used Cu triangle plates as SERS substrate, and modified the morphology of Cu triangle plates through H 2 O 2 /HCl etching agent to obtain more plasma resonance hot spots, leading to significantly improve the SERS sensitivity and ability [27]. At present, the SERS with the triangular substrate has made great progress in the experiment.…”

Section: Introductionmentioning

confidence: 99%

The performance of surface enhanced Raman scattering and spatial resolution with triangular plate dimer from ultra-ultraviolet to near-infrared range

Wei¹,

Pei²,

Yan³

et al. 2021

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The theoretical research on surface enhanced Raman spectroscopy (SERS) of triangular plate dimer (TPD) is of great significance for the design of experimental substrates. In this paper, the SERS properties of the TPD with Au, Ag, Al and Cu have been theoretical investigated in the ultra-ultraviolet, visible and near-infrared region. The influence of the TPD configuration, including the tip radian, the dimer distance and the aspect ratio on the electric field, Raman enhancement and spatial resolution are studied by the finite element method. The results show that there are dipole resonance band and quadruple dipole resonance band in the surface plasmon resonance band of TPD. The tip radian and dimer distance play the dominant role in the electric field enhancement, and the aspect ratio can be mainly used to tune the peak position of the electric field. The smaller tip radian and dimer distance will produce a stronger localized electric field and a small red shift of the peak position. Adjusting the aspect ratio can tune the position of electric field peak from ultraviolet (UV) to near-infrared without changing the peak value of the electric field significantly, especially for Al TPD. The maximum Raman enhancement factor of Au, Ag and Cu all reach 11 orders of magnitude, and 9 orders of magnitude for Al. The spatial resolution changes linearly with the gap distance, and the maximum spatial distributions of Au, Ag, Al and Cu achieve 0.65 nm, 0.67 nm, 0.69 nm and 0.70 nm with the dimer distance of 1 nm. Our results not only provide a better theoretical guidance for the optimization of TPD substrates in the SERS experiment, but also extend its application scope from ultra-UV to near-infrared range.

show abstract

Active site-dominated electromagnetic enhancement of surface-enhanced Raman spectroscopy (SERS) on a Cu triangle plate

Abstract: Chemical etching CTP to create a rough surface that has high enhancement factors of SERS.

Cited by 10 publications

References 37 publications

Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

Trends in Application of SERS Substrates beyond Ag and Au, and Their Role in Bioanalysis

The performance of surface enhanced Raman scattering and spatial resolution with triangular plate dimer from ultra-ultraviolet to near-infrared range

Contact Info

Product

Resources

About