Thermal dewetting tunes surface enhanced resonance Raman scattering (SERRS) performance

Andrikaki, Sonia; Govatsi, Κaterina; Yannopoulos, Spyros N.; Voyiatzis, George A.; Andrikopoulos, Konstantinos S.

doi:10.1039/c8ra05451g

Cited by 13 publications

(7 citation statements)

References 23 publications

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“…The results presented here, indicate that the increase in the Raman signal is due to the presence of a semicontinuous Au surface with well distributed holes. This is a key difference with previous works, in which island-type morphologies were obtained over non-mesoporous substrates [48][49][50][51]. Moreover, no significant SERS spectra of pNTP was observed when increasing the Au layer thickness to 15 nm, as can be seen in Fig.…”

Section: Sers Sensingcontrasting

confidence: 59%

“…According to bibliography, nanosized islands are formed when Au thin films are exposed to a heating treatment [47,49,61]. Thus, in order to compare Au film stability and sensing properties, samples were treated for 1 h at 300 °C as explained in the experimental section.…”

Section: Synthesized Systemsmentioning

confidence: 99%

“…However, a thin layer of Cr (< 0.3 nm) was used to ensure Au adhesivity over the SiO 2 film. Thus, despite there are several examples in literature in which metallic nanostructures were synthesized over different substrates and used for SERS or LSPR based sensors [49][50][51][52], the use of mesoporous oxides as agents for nanostructuring noble metal thin films was not described.…”

Section: Introductionmentioning

confidence: 99%

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Gold semicontinuous thin-film-coated mesoporous TiO2 for SERS substrates

et al. 2020

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In this work, the preparation and thermal evolution of sputtered semicontinuous gold thin films obtained over ordered mesoporous TiO 2 films are presented. The controlled surface topography of the ordered mesoporous TiO 2 substrate was used as template for obtaining plasmonic hotspots for Surface Enhanced Raman Spectroscopy (SERS) applications. Plasmonic thin film was obtained by Au sputtering when film thickness was under circa 10 nm. Above this value, the porosity effects from the substrate were lost and Raman signal enhancement with it. Moreover, heat treatment was explored in order to obtain gold nanoislands that can also provide very efficient Raman enhancement. Hence, a very straightforward synthesis procedure is presented for sensing application, even for large scale production.

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Section: Sers Sensingcontrasting

confidence: 59%

Section: Synthesized Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gold semicontinuous thin-film-coated mesoporous TiO2 for SERS substrates

et al. 2020

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“…The solid-state dewetting process applies to a wide class of materials and alloys [19,22,[24][25][26][27]. Interestingly, this process occurring in noble metals (Au and Ag) supports the development of the plasmonic sensors based on surface-enhanced Raman scattering (SERS) effect by the fabrication of suitable nanostructured substrates with high performance and low cost [21,28,29]. On the other hand, the solid-state dewetting applied to single-and multi-layer magnetic thin film strengthens the understanding of the correlation between the technologically relevant magnetic properties, such as anisotropy, susceptibility, coercivity, remanence and the morphological features of the obtained NPs [24,25,30].…”

Section: Introductionmentioning

confidence: 97%

Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe70Pd30 Nanoparticles Obtained by the Solid-State Dewetting

Barrera

Celegato

Cialone

et al. 2021

Sensors

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Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and “top-down” nanofabrication technique able to induce a controlled morphological transformation of a continuous thin film into an ordered nanoparticle array. Here, magnetic Fe70Pd30 thin film with 30 nm thickness is deposited by the co-sputtering technique on a monocrystalline (MgO) or amorphous (Si3N4) substrate and, subsequently, annealed to promote the dewetting process. The different substrate properties are able to tune the activation thermal energy of the dewetting process, which can be tuned by depositing on substrates with different microstructures. In this way, it is possible to tailor the final morphology of FePd nanoparticles as observed by advanced microscopy techniques (SEM and AFM). The average size and height of the nanoparticles are in the ranges 150–300 nm and 150–200 nm, respectively. Moreover, the induced spatial confinement of magnetic materials in almost-spherical nanoparticles strongly affects the magnetic properties as observed by in-plane and out-of-plane hysteresis loops. Magnetization reversal in dewetted FePd nanoparticles is mainly characterized by a rotational mechanism leading to a slower approach to saturation and smaller value of the magnetic susceptibility than the as-deposited thin film.

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“…Absorber coatings conceived to achieve near perfect absorption at specific wavelength range have been demonstrated by integrating vapor deposited amorphous metamaterials, such as metallic amorphous metasurfaces [26,27] dielectric/metal [28][29][30], semiconductor/metal [24], and metal/metal alloys nanocomposite films [31]. Among these coatings, metallic amorphous metasurfaces are fabricated by sputtering [26], thermal dewetting [32], spin coating [33] approaches, which are straightforward to implement into conventional clean room fabrication processes. However, the optical properties of metallic amorphous metasurfaces are constrained by their surface morphology related to the coating thickness, which is cumbersome to tune with the necessary resolution for different applications.…”

Section: Introductionmentioning

confidence: 99%

Hybrid graphene metasurface for near-infrared absorbers

Rahman¹,

Raza²,

Younes³

et al. 2019

Opt. Express

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We experimentally demonstrated an amorphous graphene-based metasurface yielding near-infrared super absorber characteristic. The structure is obtained by alternatively combining magnetron-sputtering deposition and graphene transfer coating fabrication techniques. The thickness constraint of the physical vapor-deposited amorphous metallic layer is unlocked and as a result, the as-fabricated graphene-based metasurface absorber achieves near-perfect absorption in the near-infrared region with an ultra-broad spectral bandwidth of 3.0 µm. Our experimental characterization and theoretical analysis further point out that the strong light-matter interaction observed is caused by localized surface plasmon resonance of the metal film's particle-like surface morphology. In addition to the enhanced light absorption characteristics, such an amorphous metasurface can be used for surface-enhanced Raman scattering applications. Meanwhile, the proposed graphene-based metasurface relies solely on CMOS-compatible, low cost and large-area processing, which can be flexibly scaled up for mass production.

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Thermal dewetting tunes surface enhanced resonance Raman scattering (SERRS) performance

Abstract: Simple, reproducible and low-cost SERS substrates for ultra-sensitive chemical analysis/quantification offered by thermal dewetting of thin metallic films.

Cited by 13 publications

References 23 publications

Gold semicontinuous thin-film-coated mesoporous TiO2 for SERS substrates

Gold semicontinuous thin-film-coated mesoporous TiO2 for SERS substrates

Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe70Pd30 Nanoparticles Obtained by the Solid-State Dewetting

Hybrid graphene metasurface for near-infrared absorbers

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