Surface-enhanced Raman scattering studies of Cu/Cu2O Core-shell NPs obtained by laser ablation

Aghdam, Hossein Dizajghorbani; Bellah, S. Moemen; Malekfar, Rasoul

doi:10.1016/j.saa.2019.117379

Cited by 33 publications

(20 citation statements)

References 66 publications

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“…[172] In some cases, Cu-Cu 2 Oc ore-shell NPs have been observed also after LAL of Cu in water with 532 or 1064 nm ns pulses. [173][174][175] Hollow cobalto xide nanospheresw ere observed during LAL of Co in water,d ue to the Kirkendall effect. [132,176] In the case of 1064 nm ns LAL of Ta in ethanol, NPs resulted in ac ore of partially oxidised Ta coated with as hell of Ta 2 O 5 .…”

Section: Conventional Nano-oxides:r Ole Of Oxide Type and Lal Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Amendola

Amans

Ishikawa

et al. 2020

Chemistry A European J

244

186

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Although oxide nanoparticles are ubiquitous in science and technology, a multitude of compositions, phases, structures, and doping levels exist, each one requiring a variety of conditions for their synthesis and modification. Besides, experimental procedures are frequently dominated by high temperatures or pressures and by chemical contaminants or waste. In recent years, laser synthesis of colloids emerged as a versatile approach to access a library of clean oxide nanoparticles relying on only four main strategies running at room temperature and ambient pressure: laser ablation in liquid, laser fragmentation in liquid, laser melting in liquid and laser defect‐engineering in liquid. Here, established laser‐based methodologies are reviewed through the presentation of a panorama of oxide nanoparticles which include pure oxidic phases, as well as unconventional structures like defective or doped oxides, non‐equilibrium compounds, metal‐oxide core–shells and other anisotropic morphologies. So far, these materials showed several useful properties that are discussed with special emphasis on catalytic, biomedical and optical application. Yet, given the endless number of mixed compounds accessible by the laser‐assisted methodologies, there is still a lot of room to expand the library of nano‐crystals and to refine the control over products as well as to improve the understanding of the whole process of nanoparticle formation. To that end, this review aims to identify the perspectives and unique opportunities of laser‐based synthesis and processing of colloids for future studies of oxide nanomaterial‐oriented sciences.

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Section: Conventional Nano-oxides:r Ole Of Oxide Type and Lal Parametersmentioning

confidence: 99%

“…[180]),t oC u-CuO (reprintedw ith permission from ref. [173],Copyright 2019, Elsevier), or from ZnO (adapted with permission from ref. [144], Copyright 2005,American Chemical Society) to Zn-ZnO NPs (adaptedw ith permission from ref.…”

Section: Mechanistic Insightsmentioning

confidence: 99%

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Amendola

Amans

Ishikawa

et al. 2020

Chemistry A European J

244

186

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“…As a consequence of the strong CT interactions between n‐WO 3 and MB, several Raman peaks associated with asymmetric vibrations in MB are selectively enhanced, including the 670 cm −1 and 1445 cm −1 . Based on the strong surface interactions, the CT contribution of n‐WO 3 to the SERS signal of MB is expectedly higher than that of b‐WO 3 , which is quantifiably obtained (Figure 3 d) using the relationship

p_{C T} (k) = \frac{I^{k} (normalC normalT) - I^{k} (normalS normalP normalR)}{I^{k} (normalC normalT) + I^{0} (normalS normalP normalR)}

, [16, 23a,b] where the non‐totally symmetric 670 cm −1 mode is chosen as line k and the totally symmetric 772 cm −1 mode is chosen as line 0 [23c] . The degree of CT for MB (1.0×10 −5 M) on n‐WO 3 is estimated to be 0.89, higher than 0.55 on b‐WO 3 (see Supporting Information, Figure S17, and Table S2 for details on calculation), indicating enhanced CT contribution to the overall SERS detection in the n‐WO 3 /MB system.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Two‐Dimensional Nanostructures: Surface Defects for Morphology‐Driven Enhanced Semiconductor SERS

2021

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Tw o-dimensional (2D) semiconductors have recently become attractive candidate substrates for surface-enhanced Raman spectroscopy, exhibiting good semiconductor-based SERS sensing for aw ider variety of application scenarios. However,the underlying mechanism remains unclear.Herein, we propose that surface defects playavital role in the magnification of the SERS performances of 2D semiconductors.Asaprototype material, ultrathin WO 3 nanosheets is used to demonstrate that surface defect sites and the resulting increased charge-carrier density can induce strong chargetransfer interactions at the substrate-molecule interface,t hereby improving the sensitivity of the SERS substrate by 100 times with high reproducibility.Further work with other metal oxides suggests the reduced dimension of 2D materials can be advantageous in promoting SERS sensing for multiple probe molecules.

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“…Copper-based substrates have promising application prospects in SERS measurements mainly due to the low cost, high SERS activity, and strong chemisorption of most analytes [ 43 ]. In terms of surface enhancement, copper nanostructures can compete with silver and gold [ 44 ]. For example, pure copper-based SERS substrates on average are capable of producing surface enhancement of ~10 6–7 , while silver and gold produce on average EF 10 8–9 (See Table 2 ).…”

Section: Coppermentioning

confidence: 99%

“…In addition, Al was reported as a substrate for Surface-Enhanced Fluorescence (SEF) spectroscopy, which could compete with and sometimes outperform typical SEF substrates such as gold and silver [ 41 , 42 ]. Moreover, according to several studies the use of less conventional non-noble metal substrates such as copper, palladium, and platinum in combination with gold and silver nanostructures has great potential for SERS applications [ 43 , 44 , 45 , 46 ]. In addition to metal substrates, the use of silicon wafers as a SERS substrate is quite widespread and has shown promising results in several studies [ 47 , 48 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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Surface-enhanced Raman scattering studies of Cu/Cu2O Core-shell NPs obtained by laser ablation

Cited by 33 publications

References 66 publications

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Room‐Temperature Laser Synthesis in Liquid of Oxide, Metal‐Oxide Core‐Shells, and Doped Oxide Nanoparticles

Ultrathin Two‐Dimensional Nanostructures: Surface Defects for Morphology‐Driven Enhanced Semiconductor SERS

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

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