Silver-Nanocellulose Composite Used as SERS Substrate for Detecting Carbendazim

Nanocellulose is an abundant green resource that, owing to the larger surface area, length, and diameter of the fibers, can be used as a framework for loading Ag nanoparticles and serve as substrate for surface enhancement Raman scattering (SERS). These properties would cause the hydroxyl groups on the surface to adsorb the Ag ions and reduce them to Ag seed to form a load fulcrum. This paper presents a convenient and environmentally friendly method for the fabrication of silver-nanocellulose composites (NCF-Ag). A commonly used pesticide, carbendazim (CBZ), was used as a SERS probe to evaluate the properties of NCF-Ag. The results showed that NCF-Ag possesses good homogeneity, reproducibility, and stability. Additionally, CBZ was found to have a low limit of detection (LOD), i.e., 1.0 × 10−8 M, which indicates the possibility for trace analysis. Furthermore, it presents good linearity with R2 = 0.98 at 1007 and 1270 cm−1 in the range from 10−4~10−7 M CBZ.

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Development of Effectual Substrates for SERS by Nanostructures-on flexible surfaces

Journal of Physics Conference Series ◽

10.1088/1742-6596/2114/1/012084 ◽

2021 ◽

Vol 2114 (1) ◽

pp. 012084

Author(s):

Hammad R. Humud ◽

Fatimah Jumaah Moaen

Keyword(s):

Raman Scattering ◽

Ag Nanoparticles ◽

Surface Enhanced Raman Scattering ◽

Wave Number ◽

Plasmonic Nanostructures ◽

Sers Substrate ◽

Two Dimensional ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

Abstract The current study examines recent advancements in surface-enhanced Raman scattering (SERS), a technique that employs flexible surfaces as an active substrate, this surfaces consist from two-dimensional thermo-plasmonic grating. With 53 nm Au layer (was deposited on the 2D grating structure of the PDMS by the PVD method). The explosive wire technique was used to preparing Ag nanoparticles that were used for the purpose of SERS. The effect of the plasmonic nanostructures on the absorption spectra and Surface - Enhanced Raman Scattering (SERS) activities was examined. Rhodamine 6G dye was used as a probe molecule. X-Ray diffraction (XRD) was used to examine the structural characteristics of the nanoparticles. The morphology was assessed using Field Emission Scanning Electron Microscopy(FESEM). A twin beam UV-Vis Spectrophotometer was used to measure the absorption of the combined Rh6G dye (concentration 1×10“–6M) with the nanostructures. a Sunshine Raman microscope system and a 50mm objective lens, used for investigating the Raman spectra of the Rh6G combined with nanostructures. The results showed that the enhancement factor (EF) for SERS of R6G (1×M) reached to (2.2×10 3) When using Ag nanoparticles and (0.08 × 103) when R6G deposited directly on the flexible substrates without nanostructures at the wave number (1650 cm−1), we produced a recyclable, homogeneous, and highly sensitive SERS substrate with dependable reproducibility. For the SERS substrate, a surface made up of two-dimensional (2D) flexible grating substrates was chosen to provide multiple modalities in electrical and medicinal applications.

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Heterostructured CuO@ZnO@Ag biomimetic setaria as wettability-switchable difunctional SERS substrate for trace pesticide and DNA detections

Nanophotonics ◽

10.1515/nanoph-2021-0179 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Chuanshen Han ◽

Yisheng Wei ◽

Fengcai Lei ◽

Shulong Zhao ◽

Yumeng Wang ◽

...

Keyword(s):

Standard Deviation ◽

Raman Scattering ◽

Single Molecule ◽

Time Domain ◽

Deoxyribonucleic Acid ◽

Limit Of Detection ◽

Sers Substrate ◽

Single Molecule Level ◽

Relative Standard ◽

Finite Different Time Domain

Abstract Wettability modification is an effective way in tailoring hotspots in surface Raman scattering (SERS) nowadays. However, due to the theoretical contradiction between hydrophobic and hydrophilic strategies, opposite views are usually put forward in building SERS structures. To realize the integration of hydrophobicity and hydrophilia in the same substrate, a wettability-switchable SERS architecture composed of heterostructured CuO@ZnO@Ag biomimetic nano Setaria (NS) has been designed and prepared in this paper. Experimentally, the structure shows impressive SERS performance under both hydrophobic and hydrophilic states. The limit of detection approaches even to single-molecule level and the lowest relative standard deviation is only ca 9.8%. Finite-different time-domain simulations and experimental analyses were systemically made to unearth the mechanism deep behind. Besides, owing to fine quantifiability, the CuO@ZnO@Ag NS shows promising potential in the detection of trace pesticide and deoxyribonucleic acid. This work provides a new idea for integrating the strategies of ‘concentration’ and ‘decentralization’, endowing SERS structure with wider application, and is also meaningful for other surface sciences.

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High performance SERS active substrates fabricated by directly growing graphene on Ag nanoparticles

RSC Advances ◽

10.1039/c5ra18333b ◽

2015 ◽

Vol 5 (110) ◽

pp. 90457-90465 ◽

Cited By ~ 26

Author(s):

Shicai Xu ◽

Jihua Wang ◽

Yan Zou ◽

Hanping Liu ◽

Guiying Wang ◽

...

Keyword(s):

Raman Scattering ◽

Ag Nanoparticles ◽

High Performance ◽

Pyrolytic Graphite ◽

High Vacuum ◽

Sers Substrate ◽

Ag Nanoparticle ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

An efficient surface enhanced Raman scattering (SERS) substrate of graphene-isolated Ag nanoparticle (G/AgNP) has been developed by using excimer laser to ablate the ordered pyrolytic graphite in high vacuum onto Ag nanoparticles.

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Selective Protection of Secondary Alcohols by Using Formic Acid as a Mild and Efficient Deprotection Reagent for Primary tert-Butyldimethylsilyl Ethers

Synlett ◽

10.1055/s-0037-1611757 ◽

2019 ◽

Vol 30 (16) ◽

pp. 1895-1898

Author(s):

Krishna Sapkota ◽

Faqing Huang

Keyword(s):

Formic Acid ◽

Environmentally Friendly ◽

Hydroxyl Groups ◽

Secondary Alcohols ◽

Secondary Hydroxyl ◽

Selective Protection ◽

Environmentally Friendly Method

A mild, efficient, and environmentally friendly method for the selective protection of secondary hydroxyl groups is described. The method involves the protection of both primary and secondary hydroxyl groups as tert-butyldimethylsilyl (TBDMS) ethers and selective deprotection of the primary TBDMS group with formic acid in acetonitrile/water. The rates of desilylation of primary and secondary TBDMS ethers by different concentrations of formic acid are determined. Formic acid of 5–20% concentration is found to selectively deprotect primary TBDMS ethers while keeping more than 95% of their secondary counterparts intact.

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Revealing the Hemispherical Shielding Effect of SiO2@Ag Composite Nanospheres to Improve the Surface Enhanced Raman Scattering Performance

Nanomaterials ◽

10.3390/nano11092209 ◽

2021 ◽

Vol 11 (9) ◽

pp. 2209

Author(s):

Fengyan Wang ◽

Daxue Du ◽

Shan Liu ◽

Linna Wang ◽

Tifeng Jiao ◽

...

Keyword(s):

Raman Scattering ◽

Ag Nanoparticles ◽

Three Dimensional ◽

Surface Enhanced Raman Scattering ◽

Shielding Effect ◽

Sers Substrate ◽

Dimensional Model ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

Many studies widely used SiO2@Ag composite nanospheres for surface enhanced Raman scattering (SERS), which mainly contributes to electromagnetic enhancement. In addition to experiments, previous simulations mostly adopted a two-dimensional model in SERS research, resulting in the three-dimensional information being folded and masked. In this paper, we adopted the three-dimensional model to simulate the electric field distribution of SiO2@Ag composite nanospheres. It is found that when the Ag nanoparticles are distributed densely on the surface of SiO2 nanospheres, light cannot pass through the upper hemisphere due to the local surface plasmon resonance (LSPR) of the Ag nanoparticles, resulting in the upper hemisphere shielding effect; and if there are no Ag nanoparticles distributed densely on the surface of SiO2 nanospheres, the strong LSPR cannot be formed, so the incident light will be guided downward through the whispering gallery mode of the spherical structure. At the same time, we designed relevant experiments to synthesize SiO2@Ag composite nanosphere as SERS substrate and used Rhodamine 6G as a probe molecule to study its SERS performance. This design achieved a significant SERS effect, and is very consistent with our simulation results.

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Highly Reproducible Surface-Enhanced Raman Scattering Detection of Alternariol Using Silver-Embedded Silica Nanoparticles

Sensors ◽

10.3390/s20123523 ◽

2020 ◽

Vol 20 (12) ◽

pp. 3523 ◽

Cited By ~ 3

Author(s):

Eunil Hahm ◽

Yoon-Hee Kim ◽

Xuan-Hung Pham ◽

Bong-Hyun Jun

Keyword(s):

Raman Scattering ◽

Silica Nanoparticles ◽

Ag Nanoparticles ◽

Limit Of Detection ◽

Surface Enhanced Raman Scattering ◽

Sers Signal ◽

Relative Standard ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

Alternariol (AOH) is a mycotoxin from fungi that has been found in processed foods due to its high thermal stability. To address the complexity and costs of conventional AOH detection methods, we propose an alternative based on surface-enhanced Raman scattering (SERS) and specially designed nanoparticle substrate. Herein, silver-embedded silica (SiO2@Ag) nanoparticles with a highly reproducible SERS signal were successfully developed for detecting AOH. Silica nanoparticles (~145 nm) were used as a template to deposit silver nanoparticles (~17 nm), thereby generating SiO2@Ag. The SiO2@Ag nanoparticles showed a good linearity between SERS signal intensity and AOH concentrations from 16 to 1000 nM with a limit of detection of 4.83 nM. Additionally, the SERS signal of the SiO2@Ag nanoparticles was highly reproducible, with relative standard deviations of 2.33–5.95% in the AOH concentration range from 10 to 10,000 nM, demonstrating the reliability of the proposed SERS method.

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Noble Metallic Pyramidal Substrate for Surface-Enhanced Raman Scattering Detection of Plasmid DNA Based on Template Stripping Method

Micromachines ◽

10.3390/mi12080923 ◽

2021 ◽

Vol 12 (8) ◽

pp. 923

Author(s):

Wenjie Wu ◽

Rui Li ◽

Maodu Chen ◽

Jiankang Li ◽

Weishen Zhan ◽

...

Keyword(s):

Raman Scattering ◽

Noble Metal ◽

Plasmid Dna ◽

Metal Film ◽

Limit Of Detection ◽

Surface Enhanced Raman Scattering ◽

Sers Substrate ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

In this paper, a new method for manufacturing flexible and repeatable sensors made of silicon solar cells is reported. The method involves depositing the noble metal film directly onto the Si template and stripping out the substrate with a pyramid morphology by using an adhesive polymer. In order to evaluate the enhancement ability of the substrate, Rhodamine 6G (R6G) were used as surface-enhanced Raman scattering (SERS) probe molecules, and the results showed a high sensitivity and stability. The limit of detection was down to 10−12 M for R6G. The finite-difference time domain (FDTD) was used to reflect the distribution of the electromagnetic field, and the electric field was greatly enhanced on the surface of the inverted pyramidal substrate, especially in pits. The mechanism of Raman enhancement of two types of pyramidal SERS substrate, before and after stripping of the noble metal film, is discussed. By detecting low concentrations of plasmid DNA, the identification of seven characteristic peaks was successfully realized using a noble metallic pyramidal substrate.

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Rapid Detection of Cypermethrin by Using Surface-Enhanced Raman Scattering Technique

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.853.102 ◽

2020 ◽

Vol 853 ◽

pp. 102-106

Author(s):

Wipawanee Leung ◽

Saksorn Limwichean ◽

Noppadon Nuntawong ◽

Pitak Eiamchai ◽

Sukon Kalasung ◽

...

Keyword(s):

Raman Scattering ◽

Rapid Detection ◽

Limit Of Detection ◽

Surface Enhanced Raman Scattering ◽

Sers Substrate ◽

Silver Nanorods ◽

Raman Spectrometer ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

Cypermethrin is a toxic pesticide in the pyrethroid group. A Surface Enhanced Raman Scattering (SERS) based sensor has been developed to achieve simple pesticide sensing. In this work, rapid detection of cypermethrin by using the handheld Raman spectroscopy coupled with SERS substrate was demonstrated. SERS-active silver nanorods substrate was used to enhance Raman signals of test samples. The effect of exposure time and drop volume of sample was studied for cypermethrin measurement. The results found that the silver nanorods substrate can be used to measure cypermethrin in the range of 10-6 to 10-3 M with a handheld Raman spectrometer. Furthermore, the Raman signal of cypermethrin was confirmed by measuring solid cypermethrin with the standard Raman spectrometer. SERS substrate was competent to detect cypermethrin with a limit of detection (LOD) of 10-6 M.

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Surface-enhanced Raman Scattering (SERS) Substrate of Colloidal Ag Nanoparticles Prepared by Laser Ablation for Ascorbic Acid Detection

Molekul ◽

10.20884/1.jm.2018.13.1.409 ◽

2018 ◽

Vol 13 (1) ◽

pp. 48 ◽

Cited By ~ 2

Author(s):

Teguh Endah Saraswati ◽

Yudha Pratama Putra ◽

Mohammad Rifqi Ihsan ◽

Isnaeni Isnaeni ◽

Yuliati Herbani

Keyword(s):

Ascorbic Acid ◽

Laser Ablation ◽

Raman Scattering ◽

Incubation Time ◽

Ag Nanoparticles ◽

Surface Enhanced Raman Scattering ◽

Sers Substrate ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

Ag nanoparticles were synthesized by laser ablation using an Ag plate in distilled water. This method was performed using a laser with a wavelength of 532 nm and energy of 30 mJ for 60 min. Ag nanoparticles successfully formed, confirmed by the selected area electron diffraction (SAED) which revealed four principal crystal planes of (111), (200), (220) and (311). The size distribution of Ag nanoparticles ranged from 5 to 40 nm, as estimated from electron imaging observed by transmission electron microscope (TEM). Ascorbic acid was used as the analyte to test the characteristics of surface-enhanced Raman scattering (SERS) of colloidal Ag nanoparticles. The concentration of ascorbic acid (1.0, 0.5 and 0.25 wt%) and incubation time (0 and 6 h) were varied to determine the limit of detection and the effect of incubation time. The Raman scattering spectroscopy results showed that the colloidal Ag nanoparticle substrate improved the signals for detection of ascorbic acid.

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Super-hierarchical Ni/porous-Ni/V2O5 nanocomposites

RSC Advances ◽

10.1039/c7ra06446b ◽

2017 ◽

Vol 7 (64) ◽

pp. 40383-40391 ◽

Cited By ~ 9

Author(s):

Yuan Yue ◽

Lian Ma ◽

Jingze Sun ◽

Hae-Kwon Jeong ◽

Hong Liang

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Heat Dissipation ◽

Low Cost ◽

Environmentally Friendly ◽

Environmentally Friendly Method

Super-hierarchical nanocomposites were designed and fabricated using a facile, low-cost, and environmentally-friendly method. The profound specific surface area and porosity increased heat dissipation for about 150 times.

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