Gold Nanocolumnar Templates for Effective Chemical Sensing by Surface-Enhanced Raman Scattering

Barbillon, Grégory; Humbert, Christophe; González, María Ujué; García-Martín, José Miguel

doi:10.3390/nano12234157

Cited by 7 publications

(5 citation statements)

References 68 publications

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“…While the LOQ is below the recommended exposure limit of 100 ppb, the key advantage of our SERS-active materials is the tremendous simplicity of the fabrication protocol. Other works that report similar LODs − require the use of either multiple and time-consuming steps or expensive and material-intensive fabrication techniques. In this work, paper is used as an inexpensive substrate, and the coating process can be done in less than 90 min using only an orbital shaker.…”

Section: Resultsmentioning

confidence: 99%

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

González-Martínez,

Rekas,

Moran-Mirabal

2023

ACS Appl. Mater. Interfaces

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Paper has emerged as an excellent alternative to create environmentally benign disposable electrochemical sensing devices. The critical step to fabricating electrochemical sensors is making paper conductive. In this work, paper-based electrodes with a high electroactive surface area (ESA) were fabricated using a simple electroless deposition technique. The polymerization time of a polydopamine adhesion layer and the gold salt concentration during the electroless deposition step were optimized to obtain uniformly conductive paper-based electrodes. The optimization of these fabrication parameters was key to obtaining the highest ESA possible. Roughening factors (R f) of 7.2 and 2.3 were obtained when cyclic voltammetry was done in sulfuric acid and potassium ferricyanide, respectively, demonstrating a surface prone to fast electron transfer. As a proof of concept, mercury detection was done through anodic stripping, achieving a limit of quantification (LOQ) of 0.9 ppb. By changing the metal deposition conditions, the roughness of the metalized papers could also be tuned for their use as surface-enhanced Raman scattering (SERS) sensors. Metallized papers with the highest SERS signal for thiophenol detection yielded a LOQ of 10 ppb. We anticipate that this method of fabricating nanostructured paper-based electrodes can accelerate the development of simple, cost-effective, and highly sensitive electrochemical and SERS sensing platforms.

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Section: Resultsmentioning

confidence: 99%

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

González-Martínez,

Rekas,

Moran-Mirabal

2023

ACS Appl. Mater. Interfaces

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“…where 𝐴 𝑆𝐸 𝑅𝑆 (𝑤) is a function describing the shape of the SERS spectrum and 𝑐 𝑎𝑑𝑠 the surface concentration of adsorbed probed molecules. As a consequence, the variation of 𝐼 𝑆𝐸 𝑅𝑆 is directly related to the variation of 𝑐 𝑎𝑑𝑠 , as experimentally shown by Barbillon et al (Barbillon et al, 2022). The surface concentration 𝑐 𝑎𝑑𝑠 depends on the concentration 𝑐 of the solution in direct contact with the surface of the SERS substrate.…”

mentioning

confidence: 75%

“…Raman enhancement requires a close contact between the probed molecules and the metallic surface, thus SERS detection is accompanied with the adsorption of the molecules on the surface of the SERS substrate. By analogy with the relationship between the normal Raman signal intensity 𝐼 𝑅𝑎𝑚𝑎𝑛 and the concentration of probed molecules 𝑐, 𝐼 𝑅𝑎𝑚𝑎𝑛 = 𝐴 𝑅𝑎𝑚𝑎𝑛 (𝑤).𝑐.𝑃.𝐼𝑇 (Paquet-Mercier et al, 2013) where 𝐴 𝑅𝑎𝑚𝑎𝑛 (𝑤) is a function of the Raman shift 𝑤 describing the shape of the Raman spectrum, 𝑃 the laser power and 𝐼𝑇 the integration time, the intensity of the SERS signal intensity 𝐼 𝑆𝐸 𝑅𝑆 is given by (Barbillon et al, 2022):…”

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confidence: 99%

Reversible, Stable and Uniform SERS in a Y-shaped Microfluidic Chip: Chemical Imaging of Concentration Gradients

Chauvet

2024

Preprint

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Imaging of chemical composition in microfluidic chips is addressed using Surface Enhanced Raman Spectroscopy (SERS). The Y-shaped SERS microfluidic chip used is fabricated by xurography and an electrodeposition method is employed to form a thin nanostructured silver layer over the bottom glass wall of the main microchannel. Used as an immobilized SERS substrate, this layer of silver nanocrystals exhibits an analytical enhancement factor of 5.104 uniformly distributed over its surface (RSD < 7%). These good performances allow the quantitative imaging of transverse diffusion profiles of Crystal Violet (CV) at low concentrations (10-8-10-6 mol/L). The SERS measurement turns out to be reversible at high laser power and this is explained by the thermal desorption of adsorbed CV (photothermal effect). However, too high heating leads to a low amount of adsorbed species and a low SERS signal. This effect is limited by using a fast enough flow inducing a cooling effect. A compromise must be found between laser power and liquid flow rate to enable a reversible and sensitive SERS measurement in the chip. These findings should contribute to the development of imaging, in microfluidic conditions, of the spatiotemporal dynamics of weakly concentrated key molecules involved in chemical, biochemical or biological processes.

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“…Thus, the SERS technique is a perfect tool allowing a quick sensing of various molecules in water [35,36]. The SERS effect is based on the enhancement of the Raman signal (vibration modes) of molecules thanks to plasmonic nanosystems [37][38][39][40]. The enhancement can mainly be due to two contributions coming from electromagnetic and chemical interactions between molecules and plasmonic nanosystems [41][42][43].…”

Section: Sers Sensors Of Pollutants In Water Treatmentmentioning

confidence: 99%

Advances in Surface-Enhanced Raman Scattering Sensors of Pollutants in Water Treatment

Barbillon,

Cheap-Charpentier

2023

Nanomaterials

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Water scarcity is a world issue, and a solution to address it is the use of treated wastewater. Indeed, in these wastewaters, pollutants such as pharmaceuticals, pesticides, herbicides, and heavy ions can be present at high concentrations. Thus, several analytical techniques were initiated throughout recent years for the detection and quantification of pollutants in different types of water. Among them, the surface-enhanced Raman scattering (SERS) technique was examined due to its high sensitivity and its ability to provide details on the molecular structure. Herein, we summarize the most recent advances (2021–2023) on SERS sensors of pollutants in water treatment. In this context, we present the results obtained with the SERS sensors in terms of detection limits serving as assessment of SERS performances of these sensors for the detection of various pollutants.

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Gold Nanocolumnar Templates for Effective Chemical Sensing by Surface-Enhanced Raman Scattering

Cited by 7 publications

References 68 publications

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

Simple and Inexpensive Fabrication of High Surface-Area Paper-Based Gold Electrodes for Electrochemical and Surface-Enhanced Raman Scattering Sensing

Reversible, Stable and Uniform SERS in a Y-shaped Microfluidic Chip: Chemical Imaging of Concentration Gradients

Advances in Surface-Enhanced Raman Scattering Sensors of Pollutants in Water Treatment

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