Gold nanostars loaded fabrics as flexible, low-cost SERS substrates and swab-based detection of thiram on fruits and vegetables

Satani, Sampath Kumar; Moram, Sree Satya Bharati; Soma, Venugopal Rao

doi:10.1088/1361-6463/acdb82

Cited by 3 publications

(3 citation statements)

References 40 publications

(50 reference statements)

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“…For comparison with works already published, SERS substrates based on GNSs placed on cotton fabric allowed to detect thiram down to 100 μM [62], while properly optimized hybrid SERS substrates, based on femtosecond laser patterned silicon embedded with GNSs, allowed to detect a minimum concentration of 12 ppb [63].…”

Section: Testing Thiram Detectionmentioning

confidence: 96%

Increasing gold nanostars SERS response with silver shells: a surface-based seed-growth approach

Parmigiani,

Schifano,

Taglietti

et al. 2024

Nanotechnology

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A straightforward method to prepare SERS chips containing a monolayer of silver coated gold nanostars (GNS@Ag) grafted on a glass surface is introduced. The synthetic approach is based on a seed growth method performed directly on surface, using GNS as seeds, and involving a green pathway, which only uses silver nitate, ascorbic acid and water, to grow the silver shell. The preparation was optimized to maximize signals obtaining a SERS response of one order of magnitude greater than that from the original GNS based chips, offering in the meantime good homogeneity and acceptable reproducibility. The proposed GNS@Ag SERS chips are able to detect pesticide Thiram down to 20 ppb.

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Section: Testing Thiram Detectionmentioning

confidence: 96%

Increasing gold nanostars SERS response with silver shells: a surface-based seed-growth approach

Parmigiani,

Schifano,

Taglietti

et al. 2024

Nanotechnology

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“…Fabrics can serve as excellent substrates for SERS-based detection owing to their uniform interwoven fibers, durability, and resistance to wear and tear (Satani et al, 2023). They possess excellent porosity, microfluidic behavior, and enhanced surface area; thus, they (Ismail, 1991) make ideal materials for efficient contact with samples.…”

Section: Fabric-based Substratesmentioning

confidence: 99%

Recent advances in the design of SERS substrates and sensing systems for (bio)sensing applications: Systems from single cell to single molecule detection

Tadi,

Shenoy,

Bharadwaj

et al. 2024

F1000Res

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The Raman effect originates from spontaneous inelastic scattering of photons by matter. These photons provide a characteristic fingerprint of this matter, and are extensively utilized for chemical and biological sensing. The probability of generation, and hence the detection of these Raman scattered photons, is very low; hence, it is difficult to use this directly for sensing in complex matrices. To amplify this signal, surface-enhanced Raman spectroscopy (SERS) has been extensively investigated and has emerged as a powerful analytical tool for sensing diverse analytes, including ions, small molecules, inorganics, organics, radionucleotides, and cells. Plasmonic nanoparticles, called hotspots, exhibit localized surface plasmon resonance (LSPR). This amplifies the Raman signal and may offer up to a 1010-fold SERS signal enhancement. The development of SERS active substrates requires further consideration and optimization of several critical features such as surface periodicity, hotspot density, mitigation of sample or surface autofluorescence, tuning of surface hydrophilicities, use of specific (bio) recognition elements with suitable linkers and bioconjugation chemistries, and use of appropriate optics to obtain relevant sensing outcomes in terms of sensitivity, cross-sensitivity, limit of detection, signal-to-noise ratio (SNR), stability, shelf-life, and disposability. This article details the optimization of the aforementioned considerations in the use of disposable materials such as commercial grades of paper, textiles, glasses, polymers, and some specific substrates such as blue-ray digital versatile discs (DVDs) for use as SERS-active substrates for point-of-use (POU) sensing applications. The advancements in these technologies have been reviewed and critiqued for analyte detection in resource-limited settings, highlighting the prospects of applications ranging from single-molecule to single-cell detection.

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“…In recent years, flexible SERS substrates have emerged as a research hotspot in the field of sensing. − In a 2019 study by Alyami et al, silver nanoparticles (AgNPs) were applied to flexible PDMS surfaces . This innovative substrate successfully detected crystalline violet and the thiram on contaminated fish and orange peels, with concentrations as low as 10 –7 and 10 –5 M, respectively.…”

Section: Introductionmentioning

confidence: 99%

Flexible Large-Area Surface Enhanced Raman Scattering Substrate Based on Bowl-Shaped Arrays of Au Nanoparticles on PDMS

Mi,

Yuan,

Hao

et al. 2024

ACS Appl. Nano Mater.

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Surface enhanced Raman scattering (SERS) is a technique that utilizes the surface electric field of metal nanostructures to amplify Raman signals and promote the analysis and detection of trace molecules. In order to harness the potential of flexible SERS substrates, this work proposes a simple and cost-effective method for preparing a large-area (circular, 7.5 cm in diameter, with a 38 cm 2 area) three-dimensional (3D) flexible SERS substrate. We first prepared a bowl-shaped nanoarray of polydimethylsiloxane (PDMS) by utilizing a polystyrene microsphere (PS) as sacrificial templates and then loaded a monolayer of gold nanoparticles (AuNPs) on it, finally a high-strength 3D AuNPs/PDMS flexible SERS substrate is obtained successfully. There are two key steps here, which are using plasma etching to regulate the gap between PS spheres and using the thermal demolding method to facilitate the separation of PS and PDMS. The ultralarge area AuNPs/PDMS substrate exhibits high SERS detection sensitivity and good uniformity. The SERS substrate possesses the advantage of multifunctional detection. The proposed substrate demonstrated detections of up to 10 −9 , 10 −7 , and 10 −8 M concentrations of rhodamine 6G (R6G), vitamin C, and thiram molecules, respectively. The detection results meet international standards. Electromagnetic simulations using the finite difference time domain reveal that the SERS enhancement originates from the surface plasmon resonance and coupling effects of AuNPs. This large-area 3D flexible SERS substrate not only enhances detection efficiency by enabling the detection of a greater number of samples or sample regions but also provides a new approach for detecting vitamin C and pesticide residues. It may also be used in electronic skin sensors, in situ pesticide residue detection, on-scene evidence collection in criminal investigations, and so on.

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Gold nanostars loaded fabrics as flexible, low-cost SERS substrates and swab-based detection of thiram on fruits and vegetables

Cited by 3 publications

References 40 publications

Increasing gold nanostars SERS response with silver shells: a surface-based seed-growth approach

Increasing gold nanostars SERS response with silver shells: a surface-based seed-growth approach

Recent advances in the design of SERS substrates and sensing systems for (bio)sensing applications: Systems from single cell to single molecule detection

Flexible Large-Area Surface Enhanced Raman Scattering Substrate Based on Bowl-Shaped Arrays of Au Nanoparticles on PDMS

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