A New SERS Substrate Based on TiO2 Nanorods Thin Film Assembled Gold Nanoparticles

2015 ◽  
Vol 1096 ◽  
pp. 481-485
Author(s):  
Xu Feng Yu ◽  
Xiu Lan Cheng ◽  
Peng Yu Lv
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Cost Effective ◽  
Noble Metal Nanoparticles ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Physical Sputtering ◽  
Surface Enhanced Raman ◽  
Biochemical Detection

Surface enhanced Raman scattering (SERS) has been proved to be a highly sensitive method to detect organic molecules at very low concentrations. In recent years, many researchers have reported that 1-dimension semiconductor nanomaterials assembled noble metal nanoparticles can get a strong SERS effect. In this paper, we succeeded to synthesize TiO2 nanorod thin films on fluorine-doped tin oxide (FTO) glass with hydrothermal synthesis which were able to be used as SERS substrates. Gold nanoparticles were assembled to TiO2 nanorod thin films using the physical sputtering method and the citrate reduction method, respectively. The field emission scanning electron microscope (FESEM) images show that the later method could achieve the more desirable and uniform distribution of gold nanoparticles. Rhodamine 6G (R6G) was chosen as the probe molecule to study the SERS performance of our novel SERS substrates. Raman scattering measurement proved that the substrates were able to enhance Raman signals by several orders of magnitude and could be applied to biochemical detection. The whole fabrication process was facile and cost-effective, and the SERS activity and reproducibility of the substrates were pretty good.

Centimeter-scale-homogeneous SERS substrates with seven-order global enhancement through thermally controlled plasmonic nanostructures

Nanoscale ◽  
2014 ◽  
Vol 6 (10) ◽  
pp. 5099-5105 ◽  
Author(s):  
Hongmei Liu ◽  
Xinping Zhang ◽  
Tianrui Zhai ◽  
Thomas Sander ◽  
Limei Chen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Plasmonic Nanostructures ◽  
Solution Processed ◽  
Homogeneous Surface ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Highly homogeneous surface-enhanced Raman scattering substrates were produced on the centimeter scale by annealing solution-processed gold nanoparticles into plasmonic nanoislands.

Large Area Au Decorated Multi-Walled CNTs Film for Surface Enhanced Raman Scattering

2013 ◽  
Vol 562-565 ◽  
pp. 826-831 ◽  
Author(s):  
Jie Zhang ◽  
Yu Lin Chen ◽  
Tuo Fan ◽  
Yong Zhu
Keyword(s):  
Raman Scattering ◽  
Resonance Effect ◽  
Surface Enhanced Raman Scattering ◽  
Fine Tuning ◽  
Sers Substrate ◽  
Large Area ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We reported on a study upon a Surface-enhanced Raman Scattering (SERS) substrate produced from a large area multi-walled carbon nanotube (MWCNT) films decorated with Au nanoparticles. The morphology and spectrum of the MWCNTs/Au composite structure was characterized with scanning electron microscopy and spectrophotometer. The SERS signals of Rhodamine 6G (R6G) absorbed on the substrate were improved, which could contribute to the enlarged surface area for adsorption of molecules and Localized Plasmon Resonance Effect. The results indicated that it is potential to produce sensitive SERS substrates via further fine-tuning of size, shape of the nanostructure.

scholarly journals Using Si/MoS2 Core-Shell Nanopillar Arrays Enhances SERS Signal

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 733
Author(s):  
Tsung-Shine Ko ◽  
Han-Yuan Liu ◽  
Jiann Shieh ◽  
De Shieh ◽  
Szu-Hung Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Detection Efficiency ◽  
Core Shell ◽  
Sers Substrate ◽  
Sers Signal ◽  
Sers Substrates ◽  
Surface Enhanced Raman ◽  
Signal Peak ◽  
Enhanced Raman Scattering

Two-dimensional layered material Molybdenum disulfide (MoS2) exhibits a flat surface without dangling bonds and is expected to be a suitable surface-enhanced Raman scattering (SERS) substrate for the detection of organic molecules. However, further fabrication of nanostructures for enhancement of SERS is necessary because of the low detection efficiency of MoS2. In this paper, period-distribution Si/MoS2 core/shell nanopillar (NP) arrays were fabricated for SERS. The MoS2 thin films were formed on the surface of Si NPs by sulfurizing the MoO3 thin films coated on the Si NP arrays. Scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were performed to characterize Si/MoS2 core-shell nanostructure. In comparison with a bare Si substrate and MoS2 thin film, the use of Si/MoS2 core-shell NP arrays as SERS substrates enhances the intensity of each SERS signal peak for Rhodamine 6G (R6G) molecules, and especially exhibits about 75-fold and 7-fold enhancements in the 1361 cm−1 peak signal, respectively. We suggest that the Si/MoS2 core-shell NP arrays with larger area could absorb more R6G molecules and provide larger interfaces between MoS2 and R6G molecules, leading to higher opportunity of charge transfer process and exciton transitions. Therefore, the Si/MoS2 core/shell NP arrays could effectively enhance SERS signal and serve as excellent SERS substrates in biomedical detection.

scholarly journals Synthesis of Gold Nanoparticle Stabilized on Silicon Nanocrystal Containing Polymer Microspheres as Effective Surface-Enhanced Raman Scattering (SERS) Substrates

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1501
Author(s):  
Guixian Zhu ◽  
Lin Cheng ◽  
Gannan Liu ◽  
Lianqing Zhu
Keyword(s):  
Raman Scattering ◽  
Metal Nanoparticles ◽  
Hot Spots ◽  
Sers Substrate ◽  
Silicon Nanocrystal ◽  
Biological Detection ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Developing ideal surface-enhanced Raman scattering (SERS) substrates is significant in biological detection. Compared with free non-aggregated noble metal nanoparticles, loading metal nanoparticles on a large matrix can achieve a higher SERS effect due to the existence of many “hot spots”. A novel SERS substrate with intense “hot spots” was prepared through reducing gold ions with silicon nanocrystal containing polymer microspheres. The substrate exhibits high SERS sensitivity with an enhancement factor of 5.4 × 107. By applying 4-mercaptopyridine as a Raman reporter, the developed SERS substrate can realize measurement of pH values. The intensity ratio of 1574 to 1607 cm−1 of 4-mercaptopyridine showed excellent pH sensitivity, which increased as the surrounding pH increased. With good stability and reliability, the pH sensor is promising in the design of biological detection devices.

scholarly journals Preparation of Monolayer Photonic Crystals from Ag Nanobulge-Deposited SiO2 Particles as Substrates for Reproducible SERS Assay of Trace Thiol Pesticide

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1205
Author(s):  
Changbo Zhang ◽  
Jiying Xu ◽  
Yi Chen
Keyword(s):  
Raman Scattering ◽  
High Sensitivity ◽  
Cost Effective ◽  
Detection Sensitivity ◽  
Sers Substrate ◽  
Hexagonal Close Packed ◽  
Cost Effective Method ◽  
Relative Standard ◽  
Surface Enhanced Raman ◽  
Sio2 Particles

Surface-enhanced Raman scattering (SERS) greatly increases the detection sensitivity of Raman scattering. However, its real applications are often degraded due to the unrepeatable preparation of SERS substrates. Herein presented is a very facile and cost-effective method to reproducibly produce a novel type of SERS substrate, a monolayer photonic crystal (PC). With a building block of laboratory-prepared monodisperse SiO2 particles deposited with space-tunable silver nanobulges (SiO2@nAg), a PC substrate was first assembled at the air–water interface through needle tip flowing, then transferred onto a silicon slide by a pulling technique. The transferred monolayer PCs were characterized by SEM and AFM to have a hexagonal close-packed lattice. They could increase Raman scattering intensity by up to 2.2 × 107-fold, as tested with p-aminothiophenol. The relative standard deviations were all below 5% among different substrates or among different locations on the same substrate. The excellent reproducibility was ascribed to the highly ordered structure of PCs, while the very high sensitivity was attributed to the strong hotspot effect caused by the appropriately high density of nanobulges deposited on SiO2 particles and by a closed lattice. The PC substrates were validated to be applicable to the SERS assay of trace thiol pesticides. Thiram pesticide is an example determined in apple juice samples at a concentration 102-fold lower than the food safety standard of China. This method is extendable to the analysis of other Raman-active thiol chemicals in different samples, and the substrate preparation approach can be modified for the fabrication of more PC substrates from other metallic nanobulge-deposited particles rather than silica only.

Surface Plasmon Structures for Surface-Enhanced Raman Scattering

2007 ◽  
Vol 1055 ◽  
Author(s):  
Muhammad Ajmal Khan ◽  
He Huang ◽  
B. Shanker ◽  
Timothy P. Hogan
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
Surface Plasmons ◽  
Surface Enhanced Raman Scattering ◽  
Semiconducting Nanowires ◽  
Silver Nanorods ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

ABSTRACTSurface-enhanced Raman scattering (SERS) can enhance the intensity of Raman radiation by many orders of magnitude for molecules bound to metallic nanostructures. SERS is generally thought to have been a result of excitation of surface plasmons in nanostructured metal, which greatly enhances local electric field experienced by the molecule. Common SERS substrates fabricated using noble metal colloidal or electrochemically roughened thin films suffer from lack of homogeneity where only few hot spots yield high enhancement. We explore semiconducting nanowires and metallic nanorods as an economical, stable, and uniform SERS substrate for the detection of trace amount of chemicals and bio-species. We utilize bulk synthesized semiconducting nanowires as nano-scale structures that can be coated with noble metals or their colloidal forms to allow for excitation of surface plasmons over broad frequency range. The use of nanowires as SERS substrates has several advantages. The surface properties of these nanowires are highly reproducible and well defined as compared to other systems like colloidal aggregates, electrochemical roughening etc. The synthesized nanowires offer many unique features (sharp vertices, noncircular cross-sections, inter-wire coupling) that may lead to larger field enhancement factors. High density of nanowires means close interaction between adjacent nanowires, which enables SERS to manifest for a broad selection of excitation sources. We have synthesized germanium dioxide and zinc oxide nanowires using the vapor-liquid-solid growth mechanism utilizing a simple quartz tube furnace set up. The nanowires are grown either using thin gold film (5-15 nm) or colloidal gold (20 nm or 60 nm) as catalyst on substrates of silicon, quartz, and alumina. The resulting nanowires are dense (100-300 nm diameter, 10-40 μm long) and randomly distributed on the substrate. The nanowires are subsequently coated with thin films (10-15 nm) of gold that provide plasmons active surface. We have also investigated silver nanorods on glass formed by grazing angle deposition using e-beam evaporation. These nanorods have a diameter of ∼ 50-70 nm with lengths averaging 300-400 nm. These well aligned high aspect ratio and dense structures are ideal for excitation of surface plasmons. The synthesized structures have been characterized using SEM, TEM, and EDS. The SERS studies were conducted using EzRaman-L system from Enwave Optronics, Inc. Silver nanorods and gold-coated nanowires have been found to exhibit significant Raman enhancement for micro-molar concentrations of Rhodamine 6G and Nile blue, and are promising candidates for SERS applications.

Surface-enhanced Raman scattering substrate based on cysteamine-modified gold nanoparticle aggregation for highly sensitive pentachlorophenol detection

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85285-85292 ◽  
Author(s):  
Qian Ma ◽  
Hongyan Zhang ◽  
Weimin Liu ◽  
Jiechao Ge ◽  
Jiasheng Wu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Nanoparticle Aggregation ◽  
Gold Nanoparticle Aggregation ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A new surface-enhanced Raman scattering (SERS) substrate based on cysteamine-modified gold nanoparticles (AuNPs) on the glass surface has been developed for the monitoring of pentachlorophenol (PCP) in water samples.

Surface-Enhanced Raman Scattering Spectra of Non-Fluorescent 4-Mercaptobenzoic Acid and Human Red Blood Cells on Carnation-Shaped Silver Meso-Flowers Monolayer

2020 ◽  
Vol 15 (11) ◽  
pp. 1356-1363
Author(s):  
Shuang-Mei Zhu ◽  
Xi-Guang Dong ◽  
Er-Jun Liang ◽  
Hong-Wei Hou ◽  
Hao-Shan Hao ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The development of new surface-enhanced Raman scattering (SERS) substrates is primarily motivated by designing synthetic substrates to obtain the significant signal enhancement. In this paper, a large-scale carnation-shaped Ag meso-flowers monolayer with sufficient “hot spots” has been synthesized on copper foil without using any capping agent. In dimethyl sulfoxide, AgNO3 is reduced by Cu for 60 min at 35 °C through the galvanic displacement reaction, and carnation-shaped Ag meso-flowers with good crystallinity and high purity are obtained. The as-fabricated carnation-shaped Ag meso-flowers monolayer is used as novel SERS substrates. Non-fluorescent 4-mercaptobenzoic acid is selected as the probe molecule to test the SERS activity, uniformity and enhancement factors (EF) of the monolayer. Experimental results show that the EF of the carnation-shaped Ag meso-flowers monolayer is up to 7.06×108 and the limit of detection is 10-11 M. Meanwhile, the biocompatibility of the carnation-shaped silver meso-flowers monolayer is tested for red blood cells detection. SERS measurements demonstrate that the carnation-shaped silver meso-flowers monolayer has good activity, uniformity and biocompatibility, and can be used as an outstanding SERS substrate, which has a broad application prospect in numerous chemical and biochemical sensing applications.

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