Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application

Ban, Rongcheng; Yu, Yingjian; Zhang, Meng; Yin, Jun; Xu, Binbin; Wu, De‐Yin; Wu, Min; Zhang, Zhigang; Tai, Huiling; Li, Jing; Kang, Junyong

doi:10.1021/acsami.6b15396

Cited by 27 publications

(11 citation statements)

References 43 publications

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“…The SERS spectra of rhodamine 6G that were adsorbed on fresh TiN NRA substrate and the same substrate that had been stored for 40 days were obtained. After 40 days, the measured intensity of SERS was reduced by 12% relative to that measured on fresh substrate [17]. The high stability of the Raman spectrum revealed a potential application of TiN NRAs in SERS.…”

Section: Introductionmentioning

confidence: 89%

Extinction Properties of Obliquely Deposited TiN Nanorod Arrays

Jen

Wang

et al. 2018

Coatings

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Plasmonic titanium nitride (TiN) nanorod arrays (NRA) were fabricated by glancing angle deposition in a DC magnetron reactive sputtering system. The morphology of the TiN NRA was varied by collimating the vapor flux. The transmittance, reflectance, and extinctance of slanted TiN nanorods with different lengths as functions of wavelength and angle of incidence were measured and analyzed. The extinction peaks in the spectra reveal the transverse and longitudinal plasmonic modes of TiN NRA upon excitation by s-polarized and p-polarized light, respectively. The near-field simulation was performed to elucidate localized field enhancements that correspond to high extinction. The extension of the high extinction band with an increasing length of the nanorods results in broadband and wide-angle light extinction for a TiN NRA with a thickness greater than 426 nm.

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Section: Introductionmentioning

confidence: 89%

Extinction Properties of Obliquely Deposited TiN Nanorod Arrays

Jen

Wang

et al. 2018

Coatings

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“…The ZnO MCAs were produced using the polystyrene (PS) nanospheres as the template followed by sputtering deposition of ZnO film, and the PS nanospheres were finally removed by thermal annealing [29]. Commercial PS nanospheres purchased from Nanomicro (Suzhou Nanomicro Technology Co., Ltd.) in the diameter of 530 nm were used as the template material to fabricate ZnO microcavity arrays.…”

Section: Fabrication Process Of Zno Mca Layermentioning

confidence: 99%

“…Here, the wide bandgap semiconductor ZnO was selected as the cavity material, which can be facilely prepared through varieties of physical or chemical methods [26][27][28]. The hollow spherical ZnO cavity was fabricated using the self-assembled PS nanosphere arrays as template combined with the physical depositing and thermal annealing as reported in our previous work [29]. The significant broadband light trapping was characterized in the optimized ZnO cavities, which was proved to be originated from the WGM resonances by the theoretical calculation.…”

Section: Introductionmentioning

confidence: 99%

Light-Trapping Engineering for the Enhancements of Broadband and Spectra-Selective Photodetection by Self-Assembled Dielectric Microcavity Arrays

Ying

Zhang

et al. 2019

Nanoscale Res Lett

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Light manipulation has drawn great attention in photodetectors towards the specific applications with broadband or spectra-selective enhancement in photo-responsivity or conversion efficiency. In this work, a broadband light regulation was realized in photodetectors with the improved spectra-selective photo-responsivity by the optimally fabricated dielectric microcavity arrays (MCAs) on the top of devices. Both experimental and theoretical results reveal that the light absorption enhancement in the cavities is responsible for the improved sensitivity in the detectors, which originated from the light confinement of the whispering-gallery-mode (WGM) resonances and the subsequent photon coupling into active layer through the leaky modes of resonances. In addition, the absorption enhancements in specific wavelength regions were controllably accomplished by manipulating the resonance properties through varying the effective optical length of the cavities. Consequently, a responsivity enhancement up to 25% within the commonly used optical communication and sensing region (800 to 980 nm) was achieved in the MCA-decorated silicon positiveintrinsic-negative (PIN) devices compared with the control ones. This work well demonstrated that the leaky modes of WGM resonant dielectric cavity arrays can effectively improve the light trapping and thus responsivity in broadband or selective spectra for photodetection and will enable future exploration of their applications in other photoelectric conversion devices.

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“…A compact arrangement of Cu NPs may produce abundant hot spots with fairly high enhancement effect with improved SERS performances. Surface coating of noble metal nanoparticles is a common method to prevent oxidation [18,19]. The size and morphology of nanocopper can be controlled by modifying surfactants on the surface of copper, and the obtained coating can also hamper the aggregation and oxidation of Cu NPs.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Stable Copper-Based SERS Chips Prepared by a Chemical Reduction Method

Dai

Huang

et al. 2021

Nanomaterials

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Cu chips are cheaper than Ag and Au chips for practical SERS applications. However, copper substrates generally have weak SERS enhancement effects and poor stability. In the present work, Cu-based SERS chips with high sensitivity and stability were developed by a chemical reduction method. In the preparation process, Cu NPs were densely deposited onto fabric supports. The as-prepared Cu-coated fabric was hydrophobic with fairly good SERS performance. The Cu-coated fabric was able to be used as a SERS chip to detect crystal violet, and it exhibited an enhancement factor of 2.0 × 106 and gave a limit of detection (LOD) as low as 10–8 M. The hydrophobicity of the Cu membrane on the fabric is favorable to cleaning background interference signals and promoting the stability of Cu NPs to environment oxidation. However, this Cu SERS chip was still poor in its long-term stability. The SERS intensity on the chip was decreased to 18% of the original one after it was stored in air for 60 days. A simple introduction of Ag onto the clean Cu surface was achieved by a replacement reaction to further enhance the SERS performances of the Cu chips. The Ag-modified Cu chips showed an increase of the enhancement factor to 7.6 × 106 due to the plasmonic coupling between Cu and Ag in nanoscale, and decreased the LOD of CV to 10–11 M by three orders of magnitude. Owing to the additional protection of Ag shell, the SERS intensity of the Cu-Ag chip after a two-month storing maintained 80% of the original intensity. The Cu-Ag SERS chips were also applied to detect other organics, and showing wide linearity range and low LOD values for the quantitative detection.

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Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application

Cited by 27 publications

References 43 publications

Extinction Properties of Obliquely Deposited TiN Nanorod Arrays

Extinction Properties of Obliquely Deposited TiN Nanorod Arrays

Light-Trapping Engineering for the Enhancements of Broadband and Spectra-Selective Photodetection by Self-Assembled Dielectric Microcavity Arrays

Highly Sensitive and Stable Copper-Based SERS Chips Prepared by a Chemical Reduction Method

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