Co-assembly of Ag nanowires and nanocubes mediated by adhesive tape in hydrophilic and hydrophobic pattern for SERS-based determination of gefitinib and ritonavir in serum

Dai, Xing; Liu, Xiaohan; Xu, Tao; Gu, Chenjie; Zhao, Feiyu; Jiang, Tao

doi:10.1016/j.snb.2023.133759

Cited by 21 publications

(3 citation statements)

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“…Several studies have been devoted to different kinds of substrates for enhancing the SERS signal, such as gold/titanium dioxide (TiO 2 ) arrays [18], porous silicon [20], nano-cavity arrays [25], gold NPs decorated with black silicon [26], silver NPs protected by monolayer graphene [27], copper nano-lines [28], etc. However, many semiconductor thin films and substrates for SERS have been reported, but the gold and silver substrates are still the best choice for SERS [29][30][31]. Therefore, researchers are still investigating other semiconductor materials as substrates to further achieve the SERS performance compared to noble metal substrates.…”

Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman scattering to realize the phonon processes in Ag nanoparticles-decorated CdS thin film

Iqbal,

Shabbir,

Toqeer

et al. 2024

Phys. Scr.

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Surface-enhanced Raman spectroscopy (SERS) technique can achieve an ultra-high sensitivity (i.e., down to the single-molecule level) via coinage-metal nanostructures such as silver, gold, copper, etc. In this work, a geometry is proposed that consists of silver nanoparticles (AgNPs) decorated on cadmium chloride (CdCl2) annealed cadmium sulfide (CdS) thin film on a glass substrate. A strong SERS enhancement in AgNPs on CdCl2 annealed CdS thin films is achieved, which is twelve times larger than the scattering from the bare CdCl2 annealed CdS thin film. The improved SERS signal allows us to observe fundamental phonon processes in CdCl2 annealed CdS thin film. Moreover, a finite difference time domain (FDTD) method is used to understand the underlying SERS physics. By using the FDTD method, robust electromagnetic field localization in the nanogap between AgNPs and at the contact point of Ag NPs and CdS thin film is studied.

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Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman scattering to realize the phonon processes in Ag nanoparticles-decorated CdS thin film

Iqbal,

Shabbir,

Toqeer

et al. 2024

Phys. Scr.

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“…Flexible substrates have clear advantages over rigid ones because they can conform to curved surfaces, be customized into various shapes and sizes, and maintain chemical and thermal stability while being cost-effective and compatible with existing fabrication methods . The majority of research efforts have concentrated on creating flexible SERS substrates, such as paper, cellulose, viscous matrix-supported hydrophilic/hydrophobic SERS chips, and glass fiber, to accommodate a wide range of flexible, bent, or nonplanar surfaces. − Polydimethylsiloxane (PDMS) elastomer has generated significant interest in the context of flexible SERS sensor applications because of its stability, lack of toxicity, mechanical flexibility, ability to bend, and hydrophobic properties . Notably, PDMS’s hydrophobic characteristic prevents the unintended spread of analyte solutions, which ensures complete concentration and allows for recycling and reuse by cleaning with alcohol and water.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible AgNW@R-PDMS SERS Substrates by Sandpaper-Assisted Lithography for Surface Swab Capture of Fungicides

Mohan,

Chandran,

Gopchandran

2024

ACS Appl. Opt. Mater.

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This study presents a cost-effective approach for fabricating flexible SERS substrates with deposited silver nanowires that is achieved through sandpaper-assisted lithography. Silver nanowires (AgNWs) are employed as a sensing element in the sandpaper-assisted soft lithography technique to fabricate a PDMSbased SERS substrate. The SERS activity of these substrates was tested using widely used fungicide molecules, viz., thiabendazole (TBZ) and thiram (TM). The as-fabricated substrate performed admirably in TBZ and TM and demonstrated an enhancement factor of 8.09 × 10 7 for TBZ and 7.68 × 10 8 for TM. It also exhibited a low limit of detection of 3.08 × 10 −10 M for TBZ and 3.20 × 10 −11 M for TM. Further, the uniformity analysis using point-to-point Raman measurements and Raman mapping also have shown promising results. The stability of these substrates was also tested for a period of 60 days with an interval of 10 days, which showed a relative standard deviation (RSD) of 15.77%. Moreover, this substrate not only offers Raman enhancement capabilities but also provides direct surface sampling capacity from fruit surfaces. This study provides a rapid and highly sensitive method for detecting trace amounts of residual fungicides present on fruit surfaces, as evidenced by experiments conducted on apple surfaces with the fabricated substrates.

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“…Consequently, the design of metal nanocrystals capable of generating intense EM fields is of paramount importance. The plasmon-induced EM enhancement of these metal nanocrystals is significantly influenced by their shape, size, and morphology. − Many types of metal structures have been synthesized to facilitate efficient SERS detection, encompassing nanosphere, nanorods, nanotriangles, nanowire, and so on. − However, the high EM field intensity of these metal nanocrystals is predominantly located at the high-curvature surface due to the lightning rod effect; many flat surfaces on this structure have limited EM enhancement under light excitation, thereby leading to low SERS efficiency. Many efficient means have been proposed to optimize the EM enhancement of metal structures, including the growth of metal nanoparticles with rough surface, − the fabrication of branched gold nanostars, − and the construction of multilayered and hollow structures. , These approaches offer valuable insights for the design of metal nanocrystals with substantial EM enhancement and enhanced SERS sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Uniform and Dense Hotspots in Au Rough-Nanocube Monolayer for Sensitive and Reproducible SERS Detection

Zhou,

Liu,

Yao

et al. 2024

ACS Appl. Nano Mater.

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Plasmonic metal nanocrystals show great potential in surface-enhanced Raman spectroscopy (SERS) detection. However, the fabrication of metal substrates with uniform and dense hotspots for sensitive and reproducible SERS remains a challenge. This study demonstrates a steerable approach to prepare a monolayer composed of Au rough nanocubes (RNCs) derived from Au nanocubes (NCs), which exhibits efficient and reproducible SERS activity for detecting organic pollutants and pesticide residues. The structure-adjustable Au RNCs are prepared by growing Au nanoparticles on Au NCs via a PbS-assisted surface modification. The as-prepared Au RNCs show better SERS activity on detecting dye molecules compared to the initial Au NCs. This improvement is attributed to the dense hotspots generated by the plasmon coupling between the Au NCs and the Au nanoparticles. Subsequently, a uniform Au RNC monolayer is fabricated using an interfacial self-assembly method, thereby exhibiting further improved SERS activity due to the electromagnetic enhancement between the adjacent nanoparticles. The Au RNC monolayer has excellent signal reproducibility with a relative standard deviation of 4.13% on detecting crystal violet owing to the large-area and uniform hotspots. Additionally, the Au RNC monolayer demonstrates excellent SERS efficiency in detecting residual thiram on fruits (10 −11 M, analytical enhancement factor of 1.24 × 10 8 at 1371 cm −1 ), melamine in milk, and dye in wastewater. These capabilities demonstrate the immense potential of the Au RNC monolayer for applications in food safety and environmental monitoring.

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Co-assembly of Ag nanowires and nanocubes mediated by adhesive tape in hydrophilic and hydrophobic pattern for SERS-based determination of gefitinib and ritonavir in serum

Cited by 21 publications

References 50 publications

Surface-enhanced Raman scattering to realize the phonon processes in Ag nanoparticles-decorated CdS thin film

Surface-enhanced Raman scattering to realize the phonon processes in Ag nanoparticles-decorated CdS thin film

Fabrication of Flexible AgNW@R-PDMS SERS Substrates by Sandpaper-Assisted Lithography for Surface Swab Capture of Fungicides

Uniform and Dense Hotspots in Au Rough-Nanocube Monolayer for Sensitive and Reproducible SERS Detection

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