Swift Heavy Ion irradiated Pd_Au Nanocomposite Thin Films for SERS Applications

Mangababu, A.; Khan, Saif; Rao, S. Venugopal; Soma, Venugopal Rao; Chawla, Amit Kumar; Deepti, _; Avasthi, D.K.

doi:10.1109/eexpolytech56308.2022.9951002

Cited by 1 publication

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“…Thus, SHI irradiation is one intriguing method that not only enhances the SERS signal but also increases the stability of the same by ensuring effective separation of NPs and analyte molecules over time. 46 Moreover, these high energetic heavy ions cause significant changes in the surface morphology, which further increases the SERS signal by means of lightningrod effect 4 as these modified regions over the surfaces or interfaces serve as electromagnetic "hotspots". 47 Thus, the applications of high energetic SHI modified NCs as SERS reported in this study will open new possibilities for highly sensitive detection and characterization of molecules, paving the way for advancements 48 in fields such as biosensing, environmental monitoring, and materials science.…”

Section: Introductionmentioning

confidence: 99%

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications

Malik,

Sarker,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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While gold nanoparticles (Au NPs) are widely used as surface-enhanced Raman spectroscopy (SERS) substrates, their agglomeration and dynamic movement under laser irradiation result in the major drawback in SERS applications, viz., the repeatability of SERS signals. We tune the optical and structural properties of sizeand shape-modified Au NPs embedded in a thin silicon nitride (Si 3 N 4 ) matrix by intense electronic excitation with swift heavy ion (SHI) irradiation with the aim of overcoming this classical SERS disadvantage. We demonstrate the shape evolution of a single layer of Au NPs inserted between amorphous Si 3 N 4 thin films under fluences of 120 MeV Au 9+ ions ranging between 1 × 10 11 and 1 × 10 13 ions cm −2 . This shape modification results in the gradual blue shift of the localized surface plasmon resonance (LSPR) dip until 1 × 10 12 ions/ cm 2 and then a sudden diminishment at 1 × 10 13 ions/cm 2 . Finite domain time difference (FDTD) simulations further justify our experimental optical spectra. The dynamical NP aggregation and dissolution, in addition to NP elongation and deformation at different fluences, are noted from 2D grazing incidence small-angle X-ray scattering (GISAXS) profiles, as well as cross-sectional transmission electron microscopy (X-TEM). The systematic shape evolution of metal NPs embedded in the insulating matrix is shown to be due to thermal spike-induced localized melting and a localized pressure hike upon SHI irradiation. Utilizing this specific control over the characteristics of Au NPs, viz., shape, size, interparticle gap, and corresponding optical response via SHI irradiation, we demonstrate their applications as very stable SERS substrates, where the separation between NPs and analyte does not alter under laser illumination. Thus, these irradiated SERS active substrates with controlled NP size and gap provide the optimal conditions for creating localized electromagnetic hotspots that amplify the SERS signals, which do not alter with time or laser exposure. We found that the film irradiated with 1 × 10 11 exhibits the highest SERS intensity due to its optimal NP size distribution and shape. Thus, not only our study provides a SERS substrate for stable and repeatable signals but also the understanding depicted here opens new research avenues in designing SERS substrates, photovoltaics, optoelectronic devices, etc. with ion beam irradiation.

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Section: Introductionmentioning

confidence: 99%

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications

Malik,

Sarker,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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Swift Heavy Ion irradiated Pd_Au Nanocomposite Thin Films for SERS Applications

Cited by 1 publication

References 22 publications

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications

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Swift Heavy Ion irradiated Pd_Au Nanocomposite Thin Films for SERS Applications

Cited by 1 publication

References 22 publications

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si3N4 Thin-Film Matrix for SERS Applications

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si3N4 Thin-Film Matrix for SERS Applications

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Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications

Tuning LSPR of Thermal Spike-Induced Shape-Engineered Au Nanoparticles Embedded in Si₃N₄ Thin-Film Matrix for SERS Applications