One-process fabrication of metal hierarchical nanostructures with rich nanogaps for highly-sensitive surface-enhanced Raman scattering

Liu, Gui-qiang; Yu, Meidong; Liu, Zhengqi; Liu, Xiaoshan; Huang, Shan; Pan, Pingping; Wang, Yan; Liu, Mulin; Gu, Grace X.

doi:10.1088/0957-4484/26/18/185702

Cited by 49 publications

(37 citation statements)

References 41 publications

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“…For example, based on the fact that the propagating surface plasmons can break through the diffraction limit, a more miniaturized and integrated waveguide device can be made [4,5]. The electric field enhancement [6][7][8] and strong absorption [9,10] caused by the local surface plasmons are widely used in surface-enhanced Raman scattering [11][12][13] and enhanced absorption [14,15]. In addition, the unique optical properties of surface plasmons have a wide range of applications in photocatalysis [16][17][18][19][20], absorber [21][22][23][24], photolithography [25][26][27][28], filter [29,30], optical data storage [31,32], and other fields [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

Zhu

Wang

et al. 2020

Photonic Sens

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In this paper, we propose two kinds of composite structures based on the one- and two-dimensional (1D&2D) gold grating on a gold film for plasmonic refractive index sensing. The resonance modes and sensing characteristics of the composite structures are numerically simulated by the finite-difference time-domain method. The composite structure of the 1D gold semi-cylinder grating and gold film is analyzed first, and the optimized parameters of the grating period are obtained. The sensitivity and figure of merit (FOM) can reach 660RIU/nm and 169RIU−1, respectively. Then, we replace the 1D grating with the 2D gold semi-sphere particles array and find that the 2D grating composite structure can excite strong surface plasmon resonance intensity in a wider period range. The sensitivity and FOM of the improved composite structure can reach 985RIU/nm and 298 RIU−1, respectively. At last, the comparison results of the sensing performance of the two structures are discussed. The proposed structures can be used for bio-chemical refractive index sensing.

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Section: Introductionmentioning

confidence: 99%

Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

Zhu

Wang

et al. 2020

Photonic Sens

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“…The enhanced localized EF induced by LSPR has not only been utilized in refractometric biosensing but also in surface-enhanced assays such as surface-enhanced fluorescence 44 and SERS. 45 − 47 SERS can provide a structural fingerprint of an analyte, which can be applied to identifying the molecules functioning in the process of the cell-substrate interaction. 48 , 49 Here, we demonstrate the capacity of the NPA to work as a SERS substrate.…”

Section: Resultsmentioning

confidence: 99%

Reproducible Plasmonic Nanopyramid Array of Various Metals for Highly Sensitive Refractometric and Surface-Enhanced Raman Biosensing

Zhang

Wang

et al. 2018

ACS Omega

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Localized surface plasmon resonance (LSPR) biosensors show great potential for practical/commercial use in clinical diagnosis, home healthcare, environmental analysis, and public healthcare. However, two main issues, that is, low refractometric sensitivity and low reproducibility (large-area uniformity and batch-to-batch consistency), hinder the extensive applications of LSPR biosensors. Therefore, plasmonic nanostructures with high sensitivity and excellent reproducibility are desirable for preparing reliable LSPR sensors. Herein, we have fabricated plasmonic nanopyramid arrays (NPAs) for several batches with reproducible morphology and optical properties by elastic soft lithography and metal thermal evaporation. NPAs of various metals (i.e., Al, Au, and Ag) were also prepared by thermal evaporation with the according metals. The transmission spectra of these NPAs showed several narrow LSPR peaks in the visible-infrared wavelength region. The refractometric sensitivities of the LSPR peaks were systematically studied, and high refractometric sensitivities of 774.0, 472.8, and 421.0 nm/RIU were achieved on Al, Au, and Ag NPAs, respectively. To demonstrate the potential of the NPAs for multiplex applications, we first applied this highly sensitive Al NPA biosensor to monitoring the process of proliferation of HeLa cancer cells, in situ and in real time. Then, we demonstrated that the Au NPA was able to identify the absorbed analytes on its surface through the surface-enhanced Raman scattering spectrum. In addition, the finite difference time domain simulations were performed to reveal the electromagnetic field enhancement on NPAs. Because of the properties of high sensitivity and excellent reproducibility of the metal NPA LSPR substrates, as well as the simplicity and cost efficiency of the fabrication method, our proposed work will accelerate the practical use of LSPR sensors.

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“…Surface-enhanced Raman scattering (SERS), as a powerful analytical approach, can provide vibration information of target molecules and has been widely investigated and applied in various fields such as bio-sensing and imaging, medical diagnosis, environmental monitoring, and food detection [1–3]. The SERS technique relies prominently on the localized surface plasmonic resonance (LSPR) of metal nanostructures [4, 5]. It is well known that the free electrons existing in metal nanostructures would oscillate coherently when they interact with the incident photon under certain conditions and thus produce the LSPR [6–10].…”

Section: Introductionmentioning

confidence: 99%

A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

Tang

Liu

et al. 2019

Nanoscale Res Lett

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Surface-enhanced Raman scattering (SERS) technique has presented great potential in medical diagnosis, environment monitoring, and food detection due to its high sensitivity, rapid response, and fingerprint effect. Many efforts have been concentrated on all kinds of strategies to produce efficient SERS platforms. Here, we report a simple and controllable method to produce large-area efficient SERS platforms with spatially stacked plasmonic hotspots. The SERS platforms consist of double-layer metal porous films and are easily fabricated by magnetron sputtering and annealing, assisted by the evaporation of hydrofluoric acid. The stacked dual-layer metal porous films show prominent Raman enhancement and ultrasensitive SERS sensing capability for different target molecules. The detection limit is demonstrated down to 10−13 M by detecting rhodamine 6G molecules. These superior Raman properties can be mainly ascribed to the highly dense spatially stacked plasmonic hotspots formed in the dual-layer metal porous films. The simple, controllable, and scalable fabrication strategy and superior Raman performance make these platforms promising candidates for the development of inexpensive, efficient, and mass-produced SERS substrates.

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One-process fabrication of metal hierarchical nanostructures with rich nanogaps for highly-sensitive surface-enhanced Raman scattering

Cited by 49 publications

References 41 publications

Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

Reproducible Plasmonic Nanopyramid Array of Various Metals for Highly Sensitive Refractometric and Surface-Enhanced Raman Biosensing

A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

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