Homogeneous large-scale crystalline nanoparticle-covered substrate with high SERS performance

Aybeke, Ece Neslihan; Lacroute, Y.; Élie-Caille, Céline; Bouhélier, Alexandre; Bourillot, Eric; Lesniewska, Éric

doi:10.1088/0957-4484/26/24/245302

Cited by 16 publications

(12 citation statements)

References 48 publications

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“…Nevertheless, the particle size is distributed over a rather broad range with a mean particle size d NP = 15-16 nm [see Fig. 1(d)], as it is common for a self-aggregated growth of nanoparticles [54]. The reflectance of the studied Au-NP/manganite films shows a surface plasmon resonance (SPR) around λ SPR = 592-606 nm, indicated by the broad reflectance peak [45,55] seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Jahn-Teller reconstructed surface of the doped manganites shown by means of surface-enhanced Raman spectroscopy

Merten

Bruchmann-Bamberg

Damaschke

et al. 2019

Phys. Rev. Materials

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We report direct evidence of the theoretically predicted electron-rich surface of doped perovskite manganites La 0.7 A 0.3 MnO 3 (A = Ca, Sr) by means of surface-enhanced Raman spectroscopy. The required Au nanoparticles were grown on top of thin manganite films by the metalorganic aerosol deposition technique, which provides a stable oxygen atmosphere and prevents deoxygenation effects. The acquired surface-enhanced Raman spectra of rhombohedral La 0.7 Sr 0.3 MnO 3 thin films reveal the symmetry-forbidden Jahn-Teller stretching modes demonstrating the predicted symmetry breaking at the surface and fallback into the orthorhombic (Pnma) structure. This results in a unique Jahn-Teller reconstructed surface structure, which limits the capabilities of mixed-valence manganites in spintronic applications, but will be highly favorable for catalytic reactions.

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Section: Resultsmentioning

confidence: 99%

Jahn-Teller reconstructed surface of the doped manganites shown by means of surface-enhanced Raman spectroscopy

Merten

Bruchmann-Bamberg

Damaschke

et al. 2019

Phys. Rev. Materials

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“…remain the same before and after the deposition of Au-NPs (see Figure 7). A scanning electron microscopy image in the inset of Figure 7 indicates a homogeneous covering of Au-NPs with a rather broad particle size distribution, commonly observed for aerosol-or vapor-based nanoparticle growth [78,79]. A mean particle size of dAu~16 nm was obtained.…”

Section: Symmetry Breaking Effectmentioning

confidence: 80%

Polaronic Emergent Phases in Manganite-based Heterostructures

Moshnyaga

Samwer

2019

Crystals

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Transition metal functional oxides, e.g., perovskite manganites, with strong electron, spin and lattice correlations, are well-known for different phase transitions and field-induced colossal effects at the phase transition. Recently, the interfaces between dissimilar perovskites were shown to be a promising concept for the search of emerging phases with novel functionalities. We demonstrate that the properties of manganite films are effectively controlled by low dimensional emerging phases at intrinsic and extrinsic interfaces and appeared as a result of symmetry breaking. The examples include correlated Jahn–Teller polarons in the phase-separated (La1−yPry)0.7Ca0.3MnO3, electron-rich Jahn–Teller-distorted surface or “dead” layer in La0.7Sr0.3MnO3, electric-field-induced healing of “dead” layer as an origin of resistance switching effect, and high-TC ferromagnetic emerging phase at the SrMnO3/LaMnO3 interface in superlattices. These 2D polaronic phases with short-range electron, spin, and lattice reconstructions could be extremely sensitive to external fields, thus, providing a rational explanation of colossal effects in perovskite manganites.

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“…The SERS analyses of biological samples were performed on gold nanoparticle substrates. The sensitivity, homogeneity, and reproducibility of these substrates have already been evaluated by analyzing methylene blue molecules and human microsomal protein cytochrome b5 . The optical characteristics of the gold nanoparticle substrates were presented briefly in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

HS-AFM and SERS Analysis of Murine Norovirus Infection: Involvement of the Lipid Rafts

Aybeke¹,

Belliot

Lemaire-Ewing

et al. 2016

Small

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Studies on human norovirus are severely hampered by the absence of a cell culture system until the discovery of murine norovirus (MNV). The cell membrane domains called lipid rafts have been defined as a port of entry for viruses. This study is conducted to investigate murine norovirus binding on the mouse leukemic monocyte macrophage cell line. Lipid raft related structures are extracted from cells by detergent treatment resulting detergent-resistant membrane (DRMs) domains. The real-time polymerase chain reaction technique is performed to detect the viral genome, thereby the MNV binding on the DRMs. The interactions between MNV and DRMs are investigated by high-speed atomic force microscopy (HS-AFM) combined with surface-enhanced Raman spectroscopy (SERS). The inoculation of the virus onto cells results in the aggregations of detergent-resistant membrane domains significantly. The characteristic Raman band of MNV is found in inoculated samples. To be sure that these results are originated from specific interactions between DRM and MNV, methyl-β-cyclo-dextrin (MβCD) is applied to disrupt lipid rafts. The MNV binding on DRMs is precluded by the MβCD treatment. The cholesterols chains are defined as a key factor in the interactions between norovirus and DRMs. The authors conclude that the MNV binding involves the presence of DRMs and cholesterol dependent.

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Homogeneous large-scale crystalline nanoparticle-covered substrate with high SERS performance

Cited by 16 publications

References 48 publications

Jahn-Teller reconstructed surface of the doped manganites shown by means of surface-enhanced Raman spectroscopy

Jahn-Teller reconstructed surface of the doped manganites shown by means of surface-enhanced Raman spectroscopy

Polaronic Emergent Phases in Manganite-based Heterostructures

HS-AFM and SERS Analysis of Murine Norovirus Infection: Involvement of the Lipid Rafts

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