Facile and versatile substrate fabrication for surface enhanced Raman spectroscopy using spark discharge generation of Au/Ag nanoparticles

Kohut, Attila; Kéri, Albert; Horváth, Viktória; Kopniczky, Judit; Ajtai, Tibor; Hopp, B.; Galbács, Gábor; Geretovszky, Zsolt

doi:10.1016/j.apsusc.2020.147268

Cited by 18 publications

(16 citation statements)

References 56 publications

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“…The sample collection time was 0.50 h and between every sample the plastic tubes and the filter holders were cleaned with a mixture of 50% ethanol (96% purity, Molar Chemical Ltd.) and 50% water solution in an ultrasonic bath (Ultrasonic 300, NEY, now Blackstone-NEY Ultrasonics). The resulting samples were stored in Petri dishes until composition measurements, which were carried out by following the same procedure we have already utilized for SDG-generated Au/Ag NPs 46 . To this end, an inductively coupled plasma mass spectrometer (ICP-MS, 7700x, Agilent Technologies Inc.) was used.…”

Section: Methodsmentioning

confidence: 99%

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Kohut

Villy

Kéri

et al. 2021

Sci Rep

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Gold/silver bimetallic nanoparticles still attract extensive interest due to their favorable properties e.g. in plasmonics or catalysis. We present here a facile and robust way for the production of clean Au/Ag binary nanoparticles (BNPs) with a total control over the composition via the spark discharge nanoparticle generation technique. With the application of pure Ag and Au electrodes, a tuning range of 55 to 90% Au content was achieved, but this can be further extended to the full 0 to 100% range by using a couple of alloyed electrodes. An added benefit of the approach is that either the concentration or the mean particle size can be kept constant at every composition by adjusting the generator parameters. Based on the systematic experimental data collected, a semi-empirical model for the prediction of the Au/Ag BNP composition was also developed. This model was used to calculate the theoretically achievable Au/Ag composition at a given spark parameter set in the parameter range most commonly used in the literature.

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Section: Methodsmentioning

confidence: 99%

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Kohut

Villy

Kéri

et al. 2021

Sci Rep

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“…This experiment provides a simple yet demonstrative example of the potential lying in fiber optic SERS sensors fabricated via spark ablation. Considering the nowadays readily available, tabletop SDGs [34, 35] and the inherent advantages of the spark-based process, such as the facile composition-tuning of high purity binary NPs [23,[36][37][38], together with the simplicity of the process the fabrication technique proposed here might be capable for the production of tailored yet inexpensive disposable fiber optic SERS sensors for real-life applications.…”

Section: Resultsmentioning

confidence: 99%

One-step fabrication of fiber optic SERS sensors via spark ablation

et al. 2021

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Spark ablation, a versatile, gas-phase physical nanoparticle synthesis method was employed to fabricate fiber-optic surface enhanced Raman scattering (SERS) sensors in a simple single-step process. We demonstrate that spark-generated silver nanoparticles can be simply deposited onto a fiber tip by means of a modified low-pressure inertial impactor, thus providing significant surface enhancement for fiber-based Raman measurements. The surface morphology of the produced sensors was characterized along with the estimation of the enhancement factor and the inter- and intra-experimental variation of the measured Raman spectrum as well as the investigation of the concentration dependence of the SERS signal. The electric field enhancement over the deposited silver nanostructure was simulated in order to facilitate the better understanding of the performance of the fabricated SERS sensors. A potential application in the continuous monitoring of a target molecule was demonstrated on a simple model system.

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“…However, these synthesis processes are usually time-consuming, and the surface morphology of resulting substrates is not reproducible. Techniques such as nanoimprint lithography [ 24 ], spark discharge [ 25 ], and laser ablation [ 26 ] are also applied to the fabrication of substrates, but these methods are either complicated or not reproducible in surface topography. Direct-current (DC) sputtering, with which conductive materials can be deposited onto the substrate, provides an effective and reliable way of fabricating SERS substrates.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive, Robust, and Recyclable TiO2/AgNP Substrate for SERS Detection

et al. 2022

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Label-free biosensors provide an important platform for detecting chemical and biological substances without needing extra labeling agents. Unlike surface-based techniques such as surface plasmon resonance (SPR), interference, and ellipsometry, surface-enhanced Raman spectroscopy (SERS) possesses the advantage of monitoring analytes both on surfaces and in solutions. Increasing the SERS enhancement is crucial to preparing high-quality substrates without quickly losing their stability, sensitivity, and repeatability. However, fabrication methods based on wet chemistry, nanoimprint lithography, spark discharge, and laser ablation have drawbacks of waste of time, complicated processes, or nonreproducibility in surface topography. This study reports the preparation of recyclable TiO2/Ag nanoparticle (AgNP) substrates by using simple arc ion plating and direct-current (dc) magnetron sputtering technologies. The deposited anatase-phased TiO2 ensured the photocatalytic degradation of analytes. By measuring the Raman spectra of rhodamine 6G (R6G) in titrated concentrations, a limit of detection (LOD) of 10−8 M and a SERS enhancement factor (EF) of 1.01 × 109 were attained. Self-cleaning was performed via UV irradiation, and recyclability was achieved after at least five cycles of detection and degradation. The proposed TiO2/AgNP substrates have the potential to serve as eco-friendly SERS enhancers for label-free detection of various chemical and biological substances.

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Facile and versatile substrate fabrication for surface enhanced Raman spectroscopy using spark discharge generation of Au/Ag nanoparticles

Cited by 18 publications

References 56 publications

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

One-step fabrication of fiber optic SERS sensors via spark ablation

Highly Sensitive, Robust, and Recyclable TiO2/AgNP Substrate for SERS Detection

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