Strong blue emission from ZnSe nanowires grown at low temperature

Zannier, Valentina; Martelli, F.; Grillo, Vincenzo; Plaisier, Jasper R.; Lausi, Andrea; Rubini, S.

doi:10.1002/pssr.201308264

Cited by 11 publications

(14 citation statements)

References 41 publications

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“…During the measurements the status of the cell attached to the cantilever did not show significant morphological variations, and the life time of the cell on Si NWs is observed to be comparable to that on collagen and glass coverslip. On the contrary, similar measurements performed on ZnSe NWs grown at low temperature on ITO substrates (online supplementary figure S2) [31] reveal that after a few contacts, the cell forms globular structures related to cell injury and death, with a fast reduction of adhesion forces (online supplementary figures S3 and S4). The same behavior is observed on flat ZnSe substrates and we conclude that the effect arises from ZnSe toxicity rather than a topographical effect.…”

Section: Resultsmentioning

confidence: 88%

High aspect ratio silicon nanowires control fibroblast adhesion and cytoskeleton organization

et al. 2017

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Cell-cell and cell-matrix interactions are essential to the survival and proliferation of most cells, and are responsible for triggering a wide range of biochemical pathways. More recently, the biomechanical role of those interactions was highlighted, showing, for instance, that adhesion forces are essential for cytoskeleton organization. Silicon nanowires (Si NWs) with their small size, high aspect ratio and anisotropic mechanical response represent a useful model to investigate the forces involved in the adhesion processes and their role in cellular development. In this work we explored and quantified, by single cell force spectroscopy (SCFS), the interaction of mouse embryonic fibroblasts with a flexible forest of Si NWs. We observed that the cell adhesion forces are comparable to those found on collagen and bare glass coverslip, analogously the membrane tether extraction forces are similar to that on collagen but stronger than that on bare flat glass. Cell survival did not depend significantly on the substrate, although a reduced proliferation after 36 h was observed. On the contrary both cell morphology and cytoskeleton organization revealed striking differences. The cell morphology on Si-NW was characterized by a large number of filopodia and a significant decrease of the cell mobility. The cytoskeleton organization was characterized by the absence of actin fibers, which were instead dominant on collagen and flat glass support. Such findings suggest that the mechanical properties of disordered Si NWs, and in particular their strong asymmetry, play a major role in the adhesion, morphology and cytoskeleton organization processes. Indeed, while adhesion measurements by SCFS provide out-of-plane forces values consistent with those measured on conventional substrates, weaker in-plane forces hinder proper cytoskeleton organization and migration processes.

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Section: Resultsmentioning

confidence: 88%

High aspect ratio silicon nanowires control fibroblast adhesion and cytoskeleton organization

et al. 2017

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“…The PL spectra of ZnSe at 10 K typically show three emission bands corresponding to the NBE region, to shallow centers and to the Y-line at low energies. [21,28] ZnSe being a polar crystal, because of Fröhlich interaction, phonon replicas often appear in the PL spectra from phononassisted emission of free and bound excitons as well as donor-acceptor pair (DAP) [28]. In particular, the spectra of the pristine sample (red lines in parts (a), (b), and (c) of Figure 8) are characterized by a broad NBE emission peaked at about 2.8 eV followed by a broader emission at low energies (the Y-line, see also ref.…”

Section: Photoluminescencementioning

confidence: 99%

Plasmon-induced resonant effects on the optical properties of Ag-decorated ZnSe nanowires

Sivan¹,

Mario²,

Catone³

et al. 2020

Nanotechnology

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In this work we present how the optical properties of ZnSe nanowires are modified by the presence of Ag nanoparticles on the sidewalls of the ZnSe nanowires. In particular we show that the low-temperature luminescence of the ZnSe nanowires changes its shape, enhancing the phonon-replicas of impurity related recombination and affecting rise and decay times of the transient absorption bleaching at room temperatures, with an increase of the former and a decrease of the latter. In contrast, the deposition of Au NPs on the ZnSe nanowires does not change the optical properties of the sample. We suggest that the mechanism underlying these experimental observations is energy transfer via the Förster interaction based on the fact that the localized surface plasmon resonance (LSPR) of Ag nanoparticles spectrally overlaps with absorption and emission of ZnSe while the Au LSPR does not.

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“…In order to allow for transient absorption measurements, we have used NWs grown on transparent substrates. As these kinds of substrates do not withstand high temperatures, we turned our attention to materials that can be grown at low temperature with good optical quality, as ZnSe [57] and Si NWs [58]. This type of samples are semitransparent and allow for a good signal-to-noise ratio in the transient measurements [20,21].…”

Section: Znse and Si Nanowiresmentioning

confidence: 99%

Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybrids

Catone,

Di Mario,

Martelli

et al. 2020

Preprint

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The knowledge of the carrier dynamics in nanostructures is of fundamental importance for the development of (opto)electronic devices. This is true for semiconducting nanostructures as well as for plasmonic nanoparticles (NPs). Indeed, improvement of photocatalytic efficiencies by combining semiconductor and plasmonic nanostructures is one of the reasons why their ultrafast dynamics are intensively studied. In this work, we will review our activity on ultrafast spectroscopy in nanostructures carried out in the recently established EuroFEL Support Laboratory. We have investigated the dynamical plasmonic responses of metal NPs both in solution and in 2D and 3D arrays on surfaces, with particular attention being paid to the effects of the nanoparticle shape and to the conversion of absorbed light into heat on a nano-localized scale. We will summarize the results obtained on the carrier dynamics in nanostructured perovskites with emphasis on the hot-carrier dynamics and in semiconductor nanosystems such as ZnSe and Si nanowires, with particular attention to the band-gap bleaching dynamics. Subsequently, the study of semiconductormetal NP hybrids, such as CeO 2 -Ag NPs, ZnSe-Ag NPs and ZnSe-Au NPs, allows the discussion of interaction mechanisms such as charge carrier transfer and Förster interaction. Finally, we assess an alternative method for the sensitization of wide band gap semiconductors to visible light by discussing the relationship between the carrier dynamics of TiO 2 NPs and V-doped TiO 2 NPs and their catalytic properties.

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Strong blue emission from ZnSe nanowires grown at low temperature

Cited by 11 publications

References 41 publications

High aspect ratio silicon nanowires control fibroblast adhesion and cytoskeleton organization

High aspect ratio silicon nanowires control fibroblast adhesion and cytoskeleton organization

Plasmon-induced resonant effects on the optical properties of Ag-decorated ZnSe nanowires

Ultrafast optical spectroscopy of semiconducting and plasmonic nanostructures and their hybrids

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