Gold nanoparticles with helical surface structure transformed from chiral molecules for SERS-active substrates preparation

Xing, Tingyang; Qian, Qiuping; Hao, Yue; Wang, Zhihui; Ye, Jin; Zhang, Ningxia; Wang, Meiyan; Zhou, Yunlong; Gao, Xiaoqing; Wu, Lijun

doi:10.1016/j.bios.2022.114430

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…substrates. Furthermore, employing porous–spiny Au–Ag NPs as SERS-active substrates, the characteristic peak at 1383 cm –1 is selected as the representative marker of thiram to calculate the EF and obtain the calibration curve . EF is the quantitative parameter to evaluate the performance of SERS-active substrates, whose value can be calculated by the following equation EF = I SERS / normalC SERS I NR / normalC NR where I SERS and I NR are the SERS and normal Raman intensities, respectively.…”

Section: Resultsmentioning

confidence: 99%

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Sun

Cao

Yuan

et al. 2023

ACS Appl. Nano Mater.

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Surface-enhanced Raman scattering (SERS) technique has been limitedly applied to the detection of trace thiram due to the weak activity of employed substrates. In this work, Au–Ag nanoparticles (NPs) with controllable morphologies are synthesized and used as SERS-active substrates for the detection of trace thiram. Porous–spiny Au–Ag NPs are synthesized with spherical Ag NPs as intermediates through in situ redox. Annular Au–Ag NPs can be further obtained by heating porous–spiny Au–Ag NPs. Here, the morphology transformation of Au–Ag NPs is first completed by means of the element diffusion theory, providing a strategy for the morphology control of complex Au–Ag NPs. Additionally, these Au–Ag NPs with optimized morphologies were chosen as substrates for the successful SERS detection of trace thiram. Especially, porous–spiny Au–Ag NPs show superior sensitivity and reproducibility. Meanwhile, using porous–spiny Au–Ag NPs as SERS-active substrates, thiram can be quantitatively detected in the range from 10–3 to 10–11 M. Thus, it is inferred that Au–Ag NPs with optimized morphologies will have great potential in the field of trace analyte detection related to food safety and environmental protection.

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Section: Resultsmentioning

confidence: 99%

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Sun

Cao

Yuan

et al. 2023

ACS Appl. Nano Mater.

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“…Both studies are performed without resonant or near-resonant exciton–plasmon couplings. Despite these progresses, the enhancement factors of PCCD are still far less than those of surface-enhanced Raman scattering spectroscopy (SERS). − Further improving the coupling between chiral molecules and plasmonic nanostructures may solve this challenge.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-Coupled Circular Dichroism of Cysteine-Embedded Ag Nanoparticles with Strong Chiral Amplification and Long-Term Stability

Wei

Wang

et al. 2023

Chem. Mater.

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Plasmonic-coupled circular dichroism (PCCD) represents a versatile method to synthesize chiroplasmonic nanoparticles (NPs), which play irreplaceable roles in various fields such as enantioselective sensing, spectroscopies, and chiral catalysis. Nonetheless, two critical challenges are faced in the development of PCCD-based chiroplasmonic NPs: low chiral amplification and poor stability. To circumvent these restrictions, we herein performed a quantitative study of the enhancement and stability of PCCD by the embedment of chiral molecules in discrete Ag NPs. Our study reveals that the high chiral amplification is attributed to the chiral molecules embedded in NPs, rather than those adsorbed on the surface. The embedment of chiral molecules significantly increases the coupling between chiral molecules and Ag NPs, and thus, a record-high chiral amplification of over 4800 times is achieved. Moreover, the CD signals of the Cys-embedded Ag NPs are almost unchanged after 3 months of storage, also benefiting from the embedment strategy. These results will open up new possibilities for designing new PCCD systems with high chiral amplification and superior stability and lay the groundwork for the applications of PCCD-based chiral NPs.

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“…Recently, chiral SERS substrates based on nanoparticles and nanotubes were proposed. 13,14 These chiral SERS substrates showed satisfactory reproducibility. However, their preparation process is complex and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

“…Surface-enhanced Raman spectroscopy (SERS), a highly sensitive technique with molecular specificity, has been used in many fields. , The chiral plasmonic SERS substrates have drawn considerable attention owing to their ultrasensitive detection of proteins and amino acids. , Thus, preparing chiral SERS substrates is fundamental for the related applications. Recently, chiral SERS substrates based on nanoparticles and nanotubes were proposed. , These chiral SERS substrates showed satisfactory reproducibility. However, their preparation process is complex and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Chiral Nanostructures through Vibration-Assisted Scratching Combined with Wet Etching for Surface-Enhanced Raman Scattering Substrates

Wang

Yan

Geng

2023

ACS Appl. Nano Mater.

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A fabrication technique is proposed based on tip-based ultrasonic vibration-assisted scratching (UVAS) combined with wet chemical etching. UVAS induced a deeper subsurface damage of the machined nanostructure than the conventional scratching (CS), obtaining a high depth-to-width ratio nanostructure after hydrofluoric acid etching. Furthermore, the tip wear for UVAS was lesser than that for CS owing to the small friction of UVAS. Furthermore, periodic nanograting structures, nanodot arrays, and chiral nanostructures were machined by controlling the UVAS trajectory. Moreover, surface-enhanced Raman scattering (SERS) substrates with nanodot arrays and chiral structures were prepared based on the transferred polydimethylsiloxane (PDMS) model after Au deposition. It was found that a large depth-to-width ratio SERS substrate contributed to a high enhancement of the Raman signal. A maximum enhancement factor of 4.03 × 105 could be obtained on an optimal nanodot array SERS substrate when measuring 10–5 mol/L rhodamine 6G (R6G). The circular dichroism (CD) spectra of the chiral nanostructures were revealed through the finite element method simulation. Moreover, the multipole resonance led to the CD enhancement of the chiral nanostructures. Furthermore, the chiral enantiomers (l- and d-cysteines) were tested with the SERS-active chiral nanostructures, which can be recognized using the chiral SERS substrates directly. Thus, the proposed method showed great potential in chiral applications such as chiral sensing and label-free detection.

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Gold nanoparticles with helical surface structure transformed from chiral molecules for SERS-active substrates preparation

Cited by 21 publications

References 33 publications

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Au–Ag Nanoparticles with Controllable Morphologies for the Surface-Enhanced Raman Scattering Detection of Trace Thiram

Plasmon-Coupled Circular Dichroism of Cysteine-Embedded Ag Nanoparticles with Strong Chiral Amplification and Long-Term Stability

Fabrication of Chiral Nanostructures through Vibration-Assisted Scratching Combined with Wet Etching for Surface-Enhanced Raman Scattering Substrates

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