Gold thickness impact on the enhancement of SERS detection in low-cost Au/Si nanosensors

2017 ◽  
Vol 52 (23) ◽  
pp. 13650-13656 ◽  
Author(s):  
G. Magno ◽  
B. Bélier ◽  
G. Barbillon
Keyword(s):  
Low Cost ◽  
Gold Thickness ◽  
Sers Detection

scholarly journals Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Kristina Gudun ◽  
Zarina Elemessova ◽  
Laura Khamkhash ◽  
Ekaterina Ralchenko ◽  
Rostislav Bukasov
Keyword(s):  
Gold Nanoparticles ◽  
Low Cost ◽  
Aluminum Foil ◽  
Cost Effective ◽  
Sers Substrate ◽  
Au Film ◽  
Response Range ◽  
Sers Detection ◽  
Film Substrate ◽  
Linear Response Range

We introduce low-cost, tunable, hybrid SERS substrate of commercial gold nanoparticles on untreated aluminum foil (AuNPs@AlF). Two or three AuNP centrifugation/resuspension cycles are proven to be critical in the assay preparation. The limits of detection (LODs) for 4-nitrobenzenethiol (NBT) and crystal violet (CV) on this substrate are about 0.12 nM and 0.19 nM, respectively, while maximum analytical SERS enhancement factors (AEFs) are about 107. In comparative assays LODs for CV measured on AuNPs@Au film and AuNPs@glass are about 0.35 nM and 2 nM, respectively. The LOD for melamine detected on AuNPs@ Al foil is 27 ppb with 3 orders of magnitude for linear response range. Overall, AuNPs@AlF demonstrated competitive performance in comparison with AuNPs@ Au film substrate in SERS detection of CV, NBT, and melamine. To check the versatility of the AuNPs@AlF substrate we also detected KNO3 with LODs of 0.7 mM and SERS EF around 2 × 103, which is on the same order with SERS EF reported for this compound in the literature.

scholarly journals Facilely Flexible Imprinted Hemispherical Cavity Array for Effective Plasmonic Coupling as SERS Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3196
Author(s):  
Jihua Xu ◽  
Jinmeng Li ◽  
Guangxu Guo ◽  
Xiaofei Zhao ◽  
Zhen Li ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Mechanical Stability ◽  
Coupling Effect ◽  
Low Cost ◽  
Flexible Substrate ◽  
Localized Surface Plasmon ◽  
Sers Substrate ◽  
Ag Nps ◽  
Surface Enhanced Raman ◽  
Sers Detection

The focusing field effect excited by the cavity mode has a positive coupling effect with the metal localized surface plasmon resonance (LSPR) effect, which can stimulate a stronger local electromagnetic field. Therefore, we combined the self-organizing process for component and array manufacturing with imprinting technology to construct a cheap and reproducible flexible polyvinyl alcohol (PVA) nanocavity array decorating with the silver nanoparticles (Ag NPs). The distribution of the local electromagnetic field was simulated theoretically, and the surface-enhanced Raman scattering (SERS) performance of the substrate was evaluated experimentally. The substrate shows excellent mechanical stability in bending experiments. It was proved theoretically and experimentally that the substrate still provides a stable signal when the excited light is incident from different angles. This flexible substrate can achieve low-cost, highly sensitive, uniform and conducive SERS detection, especially in situ detection, which shows a promising application prospect in food safety and biomedicine.

scholarly journals Low-Cost, Disposable, Flexible and Highly Reproducible Screen Printed SERS Substrates for the Detection of Various Chemicals

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Wei Wu ◽  
Li Liu ◽  
Zhigao Dai ◽  
Juhua Liu ◽  
Shuanglei Yang ◽  
...  
Keyword(s):  
Screen Printing ◽  
Large Scale ◽  
Low Cost ◽  
Large Area ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Relative Standard ◽  
Sers Detection ◽  
On Line ◽  
Liquid Milk

Abstract Ideal SERS substrates for sensing applications should exhibit strong signal enhancement, generate a reproducible and uniform response and should be able to fabricate in large-scale and low-cost. Herein, we demonstrate low-cost, highly sensitive, disposable and reproducible SERS substrates by means of screen printing Ag nanoparticles (NPs) on a plastic PET (Polyethylene terephthalate) substrates. While there are many complex methods for the fabrication of SERS substrates, screen printing is suitable for large-area fabrication and overcomes the uneven radial distribution. Using as-printed Ag substrates as the SERS platform, detection of various commonly known chemicals have been done. The SERS detection limit of Rhodamine 6G (R6G) is higher than the concentration of 1 × 10−10 M. The relative standard deviation (RSD) value for 784 points on the detection of R6G and Malachite green (MG) is less than 20% revealing a homogeneous SERS distribution and high reproducibility. Moreover, melamine (MA) is detected in fresh liquid-milk without additional pretreatment, which may accelerate the application of rapid on-line detection of MA in liquid milk. Our screen printing method highlights the use of large-scale printing strategies for the fabrication of well-defined functional nanostructures with applications well beyond the field of SERS sensing.

A porous Au–Ag hybrid nanoparticle array with broadband absorption and high-density hotspots for stable SERS analysis

Nanoscale ◽  
2019 ◽  
Vol 11 (19) ◽  
pp. 9587-9592 ◽  
Author(s):  
Kuanguo Li ◽  
Guangju Liu ◽  
Sheng Zhang ◽  
Yanqiu Dai ◽  
Sonia Ghafoor ◽  
...  
Keyword(s):  
Low Cost ◽  
High Sensitivity ◽  
High Density ◽  
Nanoparticle Array ◽  
Broadband Absorption ◽  
Sers Detection ◽  
Hybrid Nanoparticle

An Au–Ag hybrid nanoparticle array with dense hotspots was constructed through a low-cost route for SERS detection with high sensitivity and stability.

scholarly journals Fractal Silver Dendrites as 3D SERS Platform for Highly Sensitive Detection of Biomolecules in Hydration Conditions

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1630 ◽  
Author(s):  
Maria José Lo Faro ◽  
Cristiano D’Andrea ◽  
Antonio Alessio Leonardi ◽  
Dario Morganti ◽  
Alessia Irrera ◽  
...  
Keyword(s):  
Low Cost ◽  
Structural Features ◽  
Low Oxygen ◽  
Optical Resonances ◽  
Dendrite Network ◽  
Highly Sensitive ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Detection Of Biomolecules ◽  
Highly Sensitive Detection

In this paper, we report on the realization of a highly sensitive and low cost 3D surface-enhanced Raman scattering (SERS) platform. The structural features of the Ag dendrite network that characterize the SERS material were exploited, attesting a remarked self-similarity and scale invariance over a broad range of length scales that are typical of fractal systems. Additional structural and optical investigations confirmed the purity of the metal network, which was characterized by low oxygen contamination and by broad optical resonances introduced by the fractal behavior. The SERS performances of the 3D fractal Ag dendrites were tested for the detection of lysozyme as probe molecule, attesting an enhancement factor of ~2.4 × 106. Experimental results assessed the dendrite material as a suitable SERS detection platform for biomolecules investigations in hydration conditions.

scholarly journals Spread spectrum SERS allows label-free detection of attomolar neurotransmitters

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wonkyoung Lee ◽  
Byoung-Hoon Kang ◽  
Hyunwoo Yang ◽  
Moonseong Park ◽  
Ji Hyun Kwak ◽  
...  
Keyword(s):  
Spread Spectrum ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Surface Enhanced Raman Spectroscopy ◽  
Experimental Result ◽  
High Temporal Resolution ◽  
Label Free ◽  
Label Free Detection ◽  
Surface Enhanced Raman ◽  
Sers Detection

AbstractThe quantitative label-free detection of neurotransmitters provides critical clues in understanding neurological functions or disorders. However, the identification of neurotransmitters remains challenging for surface-enhanced Raman spectroscopy (SERS) due to the presence of noise. Here, we report spread spectrum SERS (ss-SERS) detection for the rapid quantification of neurotransmitters at the attomolar level by encoding excited light and decoding SERS signals with peak autocorrelation and near-zero cross-correlation. Compared to conventional SERS measurements, the experimental result of ss-SERS shows an exceptional improvement in the signal-to-noise ratio of more than three orders of magnitude, thus achieving a high temporal resolution of over one hundred times. The ss-SERS measurement further allows the attomolar SERS detection of dopamine, serotonin, acetylcholine, γ-aminobutyric acid, and glutamate without Raman reporters. This approach opens up opportunities not only for investigating the early diagnostics of neurological disorders or highly sensitive biomedical SERS applications but also for developing low-cost spectroscopic biosensing applications.

scholarly journals Detection of Listeria innocua on roll-to-roll produced SERS substrates with gold nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62981-62989 ◽  
Author(s):  
S. Uusitalo ◽  
M. Kögler ◽  
A.-L. Välimaa ◽  
A. Popov ◽  
Yu. Ryabchikov ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Pathogen Detection ◽  
Low Cost ◽  
Critical Role ◽  
Listeria Innocua ◽  
Early Prevention ◽  
Sers Substrates ◽  
Roll To Roll ◽  
Sensing Platforms ◽  
Sers Detection

The rapid and accurate detection of food pathogens plays a critical role in the early prevention of foodborne epidemics. Combination of low cost sensing platforms and SERS detection can offer a solution for the pathogen detection.

scholarly journals Online SERS detection and characterization of eight biologically-active peptides separated by capillary zone electrophoresis

The Analyst ◽  
2015 ◽  
Vol 140 (5) ◽  
pp. 1516-1522 ◽  
Author(s):  
Pierre Negri ◽  
Scott A. Sarver ◽  
Nicole M. Schiavone ◽  
Norman J. Dovichi ◽  
Zachary D. Schultz
Keyword(s):  
Low Cost ◽  
Biologically Active ◽  
Sheath Flow ◽  
Active Peptides ◽  
Biologically Active Peptides ◽  
Zone Electrophoresis ◽  
Sers Detection ◽  
Capillary Zone ◽  
Specific Detector

Sheath-flow SERS provides a low cost, sensitive and chemical specific detector for routine characterization of biomolecules following a CZE separation.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Chromic Acid Etching of Polyethylene

1973 ◽  
Vol 31 ◽  
pp. 72-73
Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard
Keyword(s):  
Chromic Acid ◽  
Low Cost ◽  
Acid Etching ◽  
Crystalline Morphology ◽  
Bulk Specimen ◽  
Morphological Studies ◽  
Perfect Form ◽  
Molecular Length ◽  
Lamellar Texture ◽  
Cost Studies

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.

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