Metal organic framework wrapped gold nanourchin assembled on filter membrane for fast and sensitive SERS analysis

Xu, Fugang; Shang, Wenjuan; Ma, Guangran; Zhu, Yongmei; Wu, Musheng

doi:10.1016/j.snb.2020.128968

Cited by 36 publications

(16 citation statements)

References 38 publications

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“…In addition, MOFs can efficiently and selectively capture analytes, including gases, and bring them near the plasmonic surface, because of their larger surface area, π–π interactions, 69 hydrophobic/hydrophilic properties, pore size, and so forth 98,99 . This enrichment ability leads to a significant improvement of the SERS performance of plasmonic platforms 100–105 . It has been shown that coating Au NPs with uniform and thin shells of MOF‐5 allowed the selective SERS detection of CO 2 in gas mixtures, 38 due to the specific adsorption of CO 2 molecules by MOF‐5, leading to a significant enhancement of the Raman signal at 1395 cm −1 .…”

Section: Synergistic Properties Of Plasmonic Mofsmentioning

confidence: 99%

Plasmonic metal‐organic frameworks

et al. 2021

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Plasmonic metal‐organic frameworks are composite nanoparticles comprising plasmonic metal nanoparticles (NPs) embedded within a metal‐organic framework (MOF) matrix. As a result, not only the functionalities of the individual components are retained, but synergistic effects additionally provide improved chemical and physical properties. Recent progress in plasmonic MOFs has demonstrated the potential for nanofabrication and various nanotechnology applications. Synthetic challenges toward plasmonic MOFs have been recently addressed, resulting in new opportunities toward practical applications, such as surface‐enhanced Raman scattering, therapy, and catalysis. The impact of key parameters (thermodynamic vs. kinetic) on the synthetic pathways of plasmonic MOFs is reviewed, while providing insight into related progress toward structure‐derived applications.

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Section: Synergistic Properties Of Plasmonic Mofsmentioning

confidence: 99%

Plasmonic metal‐organic frameworks

et al. 2021

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“…Xu et al employed gold nanourchins (GNUs) to achieve fast and sensitive SERS sensing of malachite green with a detection limit of 0.1 nM. 35 Inspired by the above discussion, in this work, we proposed a "turn-on" UCL−SERS dual-mode aptasensor for the sensitive and selective measurement of OTA in beer samples based on the alteration of aptamer conformation after recognition with OTA to modulate the two signals intensity. Unlike the previous study, we employed UCNP as a luminescence label, TAMRA as a quencher and Raman reporter, and GNU as a SERS substrate.…”

Section: ■ Introductionmentioning

confidence: 96%

“…Urchinlike gold nanoparticles with multiple sharp spiky structures can be an impressive candidate for providing not only a larger surface area for the binding of Raman reporters or biorecognition molecules but also stronger localized electric field enhancement, contributing to better sensitivity toward trace-level sensing. Xu et al employed gold nanourchins (GNUs) to achieve fast and sensitive SERS sensing of malachite green with a detection limit of 0.1 nM …”

Section: Introductionmentioning

confidence: 99%

Upconversion Nanoparticles Assembled with Gold Nanourchins as Luminescence and Surface-Enhanced Raman Scattering Dual-Mode Aptasensors for Detection of Ochratoxin A

Lin

et al. 2021

ACS Appl. Nano Mater.

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Ochratoxin A (OTA), a toxic mycotoxin in contaminated cereal-based food, poses a great challenge to human health worldwide. Hence, fabricating sensitive and robust chemo/biosensors for OTA in the field of food safety is still highly desired. Herein, we developed an upconversion luminescence and surface-enhanced Raman scattering (UCL–SERS) dual-mode aptasensor for the sensitive detection of OTA by using upconversion nanoparticles (UCNPs) as a luminescence label, gold nanourchins (GNUs) as an enhancing substrate, and the organic dye TAMRA as a quencher and Raman reporter. The “turn-on” dual-mode aptasensor was assembled through the hybridization of complementary DNA-conjugated UCNPs (cDNA–UCNPs) and TAMRA-aptamer-modified GNUs (TAMRA-Apt-GNUs), which produced both weak UCL and SERS signals. Upon the addition of OTA, this aptasensor disintegrated to release cDNA–UCNPs due to the preferential combination of the aptamer with OTA, resulting in the recovery of UCL. In addition, conformational alteration of the aptamer shortened the spatial distance between TAMRA and GNU, generating a high SERS signal. Under optimal conditions, this dual-mode aptasensor achieved low detection limits of 3.2 pg/mL (0.01–100 ng/mL) with the UCL modality and 8.6 pg/mL (0.01–50 ng/mL) with the SERS modality. This aptasensor was further applied to detect OTA in spiked beer samples with recoveries of 95.2–103% for UCL and 92.4–108% for SERS. Compared with the single-mode sensor, the proposed aptasensor had more detection flexibility with two alternative support instruments, improved detection accuracy, and good complementarity by combining the merits of the two signals. We envision that this biosensor would hold great application prospects in monitoring biological contaminants.

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“…In addition to the sensitivity, the signal reproducibility of a SERS substrate is extensively crucial for reliable detection of trace analytes in practice, especially for quantitative analysis. In this regard, plenty of pioneered studies have also been conducted and have drawn enlightening suggestions, such as employing plasmonic materials with high chemical stability [ 26 ], fabricating nanostructures with well-defined geometry [ 27 , 28 , 29 ], and improving the uniformity of the entire substrates [ 30 ]. Accordingly, mass-produced Au hierarchical nanoarchitectures commonly show great advantages as basic sensitive units for reproducible detection in the SERS field.…”

Section: Introductionmentioning

confidence: 99%

High-Density-Nanotips-Composed 3D Hierarchical Au/CuS Hybrids for Sensitive, Signal-Reproducible, and Substrate-Recyclable SERS Detection

Liu²,

et al. 2022

Nanomaterials

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Surface-enhanced Raman scattering (SERS) provides an unprecedented opportunity for fingerprinting identification and trace-level detection in chemistry, biomedicine, materials, and so on. Although great efforts have been devoted to fabricating sensitive plasmonic nanomaterials, it is still challenging to batch-produce a SERS substrate with high sensitivity, good reproducibility, and perfect recyclability. Here, we describe a facile fabrication of three-dimensional (3D) hierarchical Au/CuS nanocomposites, in which high-density Au nanotips enable highly SERS-active sensing, and the well-defined microflower (MF) geometry produces perfect signal reproducibility (RSD < 5%) for large laser spot excitations (>50 μm2), which is particularly suitable for practical on-site detection with a handheld Raman spectrometer. In addition, a self-cleaning ability of this Au/CuS Schottky junction photocatalyst under sunlight irradiation allows complete removal of the adsorbed analytes, realizing perfect regeneration of the SERS substrates over many cycles. The mass-production, ultra-sensitive, high-reproducibility, and fast-recyclability features of hierarchical Au/CuS MFs greatly facilitate cost-effective and field SERS detection of trace analytes in practice.

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Metal organic framework wrapped gold nanourchin assembled on filter membrane for fast and sensitive SERS analysis

Cited by 36 publications

References 38 publications

Plasmonic metal‐organic frameworks

Plasmonic metal‐organic frameworks

Upconversion Nanoparticles Assembled with Gold Nanourchins as Luminescence and Surface-Enhanced Raman Scattering Dual-Mode Aptasensors for Detection of Ochratoxin A

High-Density-Nanotips-Composed 3D Hierarchical Au/CuS Hybrids for Sensitive, Signal-Reproducible, and Substrate-Recyclable SERS Detection

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