Femtosecond laser patterned silicon embedded with gold nanostars as a hybrid SERS substrate for pesticide detection

Moram, Sree Satya Bharati; Byram, Chandu; Soma, Venugopal Rao

doi:10.1039/d2ra07859g

Cited by 8 publications

(5 citation statements)

References 47 publications

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“…Similarly, C-fabric with and without star-shaped Au NPs were tested with NB molecule (10 mM), and the corresponding Raman and SERS spectra are depicted in figure 9(c). The Raman peaks at 590 cm −1 and 662 cm −1 were observed and matched with the previous work [37]. The presence of star-shaped Au NPs on the C-fabric enhanced the intensity of the SERS signal by ∼17 and ∼4 times for MB at 1620 cm −1 and NB at 590 cm −1 , respectively.…”

Section: Optimizing Soaking Timesupporting

confidence: 87%

“…Subsequently, the presence of star-shaped Au NPs on C-fabric SERS efficiency was tested with another probe molecule MB, at 1 mM concentration. The major peak of MB at 1620 cm −1 and the remaining peaks at 1393 cm −1 , 945 cm −1 , and 445 cm −1 were found to coincide with previous reports [37] and the corresponding spectra are illustrated in figure 9(b). Similarly, C-fabric with and without star-shaped Au NPs were tested with NB molecule (10 mM), and the corresponding Raman and SERS spectra are depicted in figure 9(c).…”

Section: Optimizing Soaking Timesupporting

confidence: 87%

“…Therefore, 60 min of soaking time was deemed sufficient for conducting the SERS measurements and this was followed in further measurements. The variation of the SERS peak intensity with respect to the soaking time is shown in figure 7 and 440 cm −1 were matched with previous reports [37]. The most prominent peak at 1368 cm −1 was considered to evaluate the increase in Raman intensity.…”

Section: Optimizing Soaking Timesupporting

confidence: 83%

“…The soaking time was optimized for the C-fabric with MB-10 µM at different times (from 0 min to 2 h), as illustrated in the data of figure 7(a). The main characteristic peaks of MB were observed at 449 cm −1 , 1393 cm −1 , and 1620 cm −1 , and all the Raman peaks matched with the previous reports [37]. The most prominent mode of MB at 1620 cm −1 was selected to examine the effect of soaking time on the SERS efficiency of C-fabric with star-shaped Au NPs.…”

Section: Optimizing Soaking Timesupporting

confidence: 75%

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

Satani

Moram

Soma

2023

J. Phys. D: Appl. Phys.

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Flexible surface-enhanced Raman spectroscopy (SERS) substrates have gained tremendous interest because they enable sample collection from uneven surfaces in real sensing applications. Herein, two different flexible textiles (cotton and synthetic fabrics) loaded with star-shaped gold (Au) nanoparticles (NPs) were utilized for detailed studies and are demonstrated as SERS substrates. Both fabrics were soaked in Au NPs synthesized via a simple wet chemical method. The colloidal star-shaped Au NPs were characterized by UV-visible absorption and TEM techniques. The C- and S-fabrics loaded with Au NPs were characterized by FESEM, X-ray diffraction, and X-ray photoelectron spectroscopic techniques. Subsequently, the SERS efficiency of C- and S-fabrics was examined with Thiram, Methylene Blue (MB), and Nile Blue (NB) molecules. Furthermore, pesticide (Thiram) residues on the surfaces of a banana, an apple, and a spinach leaf were investigated by a simple swabbing method. The utility of these substrates is demonstrated by performing the SERS measurements using a portable Raman spectrometer, which is expedient for real-time applications.

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Section: Optimizing Soaking Timesupporting

confidence: 87%

Section: Optimizing Soaking Timesupporting

confidence: 87%

Section: Optimizing Soaking Timesupporting

confidence: 83%

Section: Optimizing Soaking Timesupporting

confidence: 75%

See 2 more Smart Citations

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

Satani

Moram

Soma

2023

J. Phys. D: Appl. Phys.

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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: 95%

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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Multi‐Functional Applications of H‐Glass Embedded with Stable Plasmonic Gold Nanoislands

Gangareddy,

Rudra,

Chirumamilla

et al. 2023

Small

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Metal nanoparticles (MNPs) are synthesized using various techniques on diverse substrates that significantly impact their properties. However, among the substrate materials investigated, the major challenge is the stability of MNPs due to their poor adhesion to the substrate. Herein, it is demonstrated how a newly developed H‐glass can concurrently stabilize plasmonic gold nanoislands (GNIs) and offer multifunctional applications. The GNIs on the H‐glass are synthesized using a simple yet, robust thermal dewetting process. The H‐glass embedded with GNIs demonstrates versatility in its applications, such as i) acting as a room temperature chemiresistive gas sensor (70% response for NO2 gas); ii) serving as substrates for surface‐enhanced Raman spectroscopy for the identifications of Nile blue (dye) and picric acid (explosive) analytes down to nanomolar concentrations with enhancement factors of 4.8 × 106 and 6.1 × 105, respectively; and iii) functioning as a nonlinear optical saturable absorber with a saturation intensity of 18.36 × 1015 W m−2 at 600 nm, and the performance characteristics are on par with those of materials reported in the existing literature. This work establishes a facile strategy to develop advanced materials by depositing metal nanoislands on glass for various functional applications.

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Femtosecond laser patterned silicon embedded with gold nanostars as a hybrid SERS substrate for pesticide detection

Abstract: We have developed simple and cost-effective hybrid surface-enhanced Raman scattering (SERS) substrates comprising fs laser patterned Si surfaces and chemically prepared gold nanostars for the trace detection of pesticide and dye molecules.

Cited by 8 publications

References 47 publications

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

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

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

Multi‐Functional Applications of H‐Glass Embedded with Stable Plasmonic Gold Nanoislands

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