A nanozyme-based enhanced system for total removal of organic mercury and SERS sensing

Líu, Hao; Guo, Yue; Wang, Yunxin; Zhang, Huidan; Ma, Xiaochen; Wen, Sisi; Jin, Jing; Song, Wei; Zhao, Bing; Ozaki, Yukihiro

doi:10.1016/j.jhazmat.2020.124642

Cited by 41 publications

(20 citation statements)

References 53 publications

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“…Trace Hg ions in water with a concentration as low as 4.19 ×10 −12 m (about 0.84 ppt) were successfully detected which is about three orders of magnitude lower than 10 × 10 −9 m , or 2000 ppt of the US threshold value for drinkable water. [ 33 , 34 , 35 ] This reveals the strong detection power of hollow hexagonal bimetallic Ag–Au RL/SiO 2 SERS chips designed predominantly from the perspective of SPP effects. The high performance of 3D hollow hexagonal bimetallic Ag–Au RL/SiO 2 SERS chips designed and fabricated here enables on‐the‐spot rapid detection of trace pollutants using a portable or even hand‐held Raman spectrometer, which undoubtedly promotes their practical applications.…”

Section: Resultsmentioning

confidence: 97%

Dielectric Walls/Layers Modulated 3D Periodically Structured SERS Chips: Design, Batch Fabrication, and Applications

Tian

Chen

et al. 2022

Advanced Science

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As an indispensable constituent of plasmonic materials/dielectrics for surface enhanced Raman scattering (SERS) effects, dielectrics play a key role in excitation and transmission of surface plasmons which however remain more elusive relative to plasmonic materials. Herein, different roles of vertical dielectric walls, and horizontal and vertical dielectric layers in SERS via 3D periodic plasmonic materials/dielectrics structures are studied. Surface plasmon polariton (SPP) interferences can be maximized within dielectric walls besieged by plasmonic layers at the wall thicknesses of integral multiple half-SPP plasmonic material-dielectric -wavelength which effectively excites localized surface plasmon resonance to improve SERS effects by one order of magnitude compared to roughness and/or nanogaps only. The introduction of extra Au nanoparticles on thin dielectric layers can further enhance SERS effects only slightly. Thus, the designed Au/SiO 2 based SERS chips show an enhancement factor of 8.9 × 10 10 , 265 times higher relative to the chips with far thinner SiO 2 walls. As many as 1200 chips are batch fabricated for a 4 in wafer using cost-effective nanoimprint lithography which can detect trace Hg ions as low as 1 ppt. This study demonstrates a complete generalized platform from design to low-cost batch-fabrication to applications for novel high performance SERS chips of any plasmonic materials/dielectrics.

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Section: Resultsmentioning

confidence: 97%

Dielectric Walls/Layers Modulated 3D Periodically Structured SERS Chips: Design, Batch Fabrication, and Applications

Tian

Chen

et al. 2022

Advanced Science

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“…For example, Liu et al prepared an Au/Ni-Fe LDH/rGO nanocomposite that both acts as enzyme mimics and surface-enhanced Raman scattering (SERS) substrate for the removal and detection of organic mercury (MeHg) ( Liu et al, 2021 ). Based on the nanozyme material, MeHg can be degraded and removed as well as detected with a LOQ of 10 nM, which is significant in terms of the multiple applications of nanozymes.…”

Section: Application In Food Contaminants Detectionmentioning

confidence: 99%

Nanozyme Applications: A Glimpse of Insight in Food Safety

Zhou

Wang

et al. 2021

Front. Bioeng. Biotechnol.

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Nanozymes own striking merits, including high enzyme-mimicking activity, good stability, and low cost. Due to the powerful and distinguished functions, nanozymes exhibit widespread applications in the field of biosensing and immunoassay, attracting researchers in various fields to design and engineer nanozymes. Recently, nanozymes have been innovatively used to bridge nanotechnology with analytical techniques to achieve the high sensitivity, specificity, and reproducibility. However, the applications of nanozymes in food applications are seldom reviewed. In this review, we summarize several typical nanozymes and provide a comprehensive description of the history, principles, designs, and applications of nanozyme-based analytical techniques in food contaminants detection. Based on engineering and modification of nanozymes, the food contaminants are classified and then discussed in detail via discriminating the roles of nanozymes in various analytical methods, including fluorescence, colorimetric and electrochemical assay, surface-enhanced Raman scattering, magnetic relaxing sensing, and electrochemiluminescence. Further, representative examples of nanozymes-based methods are highlighted for contaminants analysis and inhibition. Finally, the current challenges and prospects of nanozymes are discussed.

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“…Taking advantage of nanozymes for the catalytic degradation of methyl mercury, several paper-based SERS sensing devices using nanozymes have been developed. In particular, Liu et al reported fabrication of Au-NiFe-layered double hydroxide (LDH)/rGO nanocomposites, which are not only efficient nanozymes with oxidase-like activity but also efficient SERS substrates to determine organic mercury [ 92 ]. Under the free radicals of electron paramagnetic resonance (EPR) spectra and the binding energy of an X-ray photoelectron spectrometer (XPS), upon the oxidase-like catalytic reaction, the oxygen molecules are captured, leading to increased O 2 radicals, while MeHg is degraded, resulting in the release of CH 3 radicals.…”

Section: Surface-enhanced Raman Scattering Signal Amplificationmentioning

confidence: 99%

Advanced Signal-Amplification Strategies for Paper-Based Analytical Devices: A Comprehensive Review

Hoang

Phan

et al. 2021

Biomedicines

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Paper-based analytical devices (PADs) have emerged as a promising approach to point-of-care (POC) detection applications in biomedical and clinical diagnosis owing to their advantages, including cost-effectiveness, ease of use, and rapid responses as well as for being equipment-free, disposable, and user-friendly. However, the overall sensitivity of PADs still remains weak, posing a challenge for biosensing scientists exploiting them in clinical applications. This review comprehensively summarizes the current applicable potential of PADs, focusing on total signal-amplification strategies that have been applied widely in PADs involving colorimetry, luminescence, surface-enhanced Raman scattering, photoacoustic, photothermal, and photoelectrochemical methods as well as nucleic acid-mediated PAD modifications. The advances in signal-amplification strategies in terms of signal-enhancing principles, sensitivity, and time reactions are discussed in detail to provide an overview of these approaches to using PADs in biosensing applications. Furthermore, a comparison of these methods summarizes the potential for scientists to develop superior PADs. This review serves as a useful inside look at the current progress and prospective directions in using PADs for clinical diagnostics and provides a better source of reference for further investigations, as well as innovations, in the POC diagnostics field.

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A nanozyme-based enhanced system for total removal of organic mercury and SERS sensing

Cited by 41 publications

References 53 publications

Dielectric Walls/Layers Modulated 3D Periodically Structured SERS Chips: Design, Batch Fabrication, and Applications

Dielectric Walls/Layers Modulated 3D Periodically Structured SERS Chips: Design, Batch Fabrication, and Applications

Nanozyme Applications: A Glimpse of Insight in Food Safety

Advanced Signal-Amplification Strategies for Paper-Based Analytical Devices: A Comprehensive Review

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