Thiago L. Vasconcelos
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View article: Evaluating Tip-Enhanced Raman Spectroscopy as a metrological tool for the determination of the number of graphene layers at the nanoscale
Evaluating Tip-Enhanced Raman Spectroscopy as a metrological tool for the determination of the number of graphene layers at the nanoscale Open
This paper presents a comparative analysis of adjacent single and bilayer graphene samples using micro-Raman spectroscopy and Tip-Enhanced Raman Spectroscopy (TERS) techniques. The measurements were carried out close to the diffraction lim…
View article: Strain-Engineered Adaptive 2D Photodetectors: A New Approach to Miniaturized Reconstructive Spectrometry
Strain-Engineered Adaptive 2D Photodetectors: A New Approach to Miniaturized Reconstructive Spectrometry Open
We present adaptive, strain-engineered photodetectors based on 2D semiconductors. Our devices present a footprint of only about 40 × 20 μm2, and they are fabricated on transparent polypropylene substrates and integrate lithograp…
View article: Enhanced strain transfer and optoelectronic performance in MoS<sub>2</sub> devices via Formvar encapsulation
Enhanced strain transfer and optoelectronic performance in MoS<sub>2</sub> devices via Formvar encapsulation Open
We systematically investigate the influence of polyvinyl formal (PVFM), commonly known as Formvar, in comparison to polycarbonate (PC) and polymethyl methacrylate (PMMA), as encapsulation materials on the strain performance of MoS 2 monola…
View article: Study of Structural and Optical Properties of Titanate Nanotubes with Erbium under Heat Treatment in Different Atmospheres
Study of Structural and Optical Properties of Titanate Nanotubes with Erbium under Heat Treatment in Different Atmospheres Open
Titanate nanotubes were synthesized and subjected to an ion exchange reaction with erbium salt aqueous solution to obtain titanate nanotubes exchanged with erbium (3+) ions. In order to evaluate the effects of the thermal treatment atmosph…
View article: Locally-enhanced optical properties in a hybrid organic/inorganic (coronene/MoS<sub>2</sub>) Van der Waals heterostructure
Locally-enhanced optical properties in a hybrid organic/inorganic (coronene/MoS<sub>2</sub>) Van der Waals heterostructure Open
Hybrid organic/inorganic Van der Waals heterostructures have emerged recently with enormous potential applications in nanotechnology and industrial areas. In these heterostructures, the interfacial effects can modulate the final properties…
View article: Tip-Enhanced Stokes–Anti-Stokes Scattering from Carbyne
Tip-Enhanced Stokes–Anti-Stokes Scattering from Carbyne Open
Carbyne, a linear chain of carbon atoms, is the truly one-dimensional allotrope of carbon and the strongest known Raman scatterer. Here, we use tip-enhanced Raman scattering (TERS) to further enhance the Raman response of a single carbyne …
View article: Tip-enhanced Raman spectroscopy of confined carbon chains
Tip-enhanced Raman spectroscopy of confined carbon chains Open
Long linear chains of carbon encapsulated in carbon nanotubes represent the finite realization of carbyne, the truly one-dimensional carbon allotrope. Driven by advances in the synthesis of such structures, carbyne has attracted significan…
View article: Rational design of large flat nitrogen-doped graphene oxide quantum dots with green-luminescence suitable for biomedical applications
Rational design of large flat nitrogen-doped graphene oxide quantum dots with green-luminescence suitable for biomedical applications Open
This paper reveals the methodology for robust preparation of purified nitrogen-doped graphene oxide quantum dots with non-cytotoxic activity against monkey epithelial kidney cells (Vero ATCC® CCL-81™).
View article: Nano-optical Imaging of In-Plane Homojunctions in Graphene and MoS<sub>2</sub> van der Waals Heterostructures on Talc and SiO<sub>2</sub>
Nano-optical Imaging of In-Plane Homojunctions in Graphene and MoS<sub>2</sub> van der Waals Heterostructures on Talc and SiO<sub>2</sub> Open
Understanding the impact of doping variations on the physical properties of two-dimensional materials is important for their application in electronic and optoelectronic devices. Here we report a nano-optical study on graphene and MoS…
View article: Anti-Stokes Raman Scattering of Single Carbyne Chains
Anti-Stokes Raman Scattering of Single Carbyne Chains Open
We investigate the anti-Stokes Raman scattering of single carbyne chains confined inside double-walled carbon nanotubes. Individual chains are identified using tip-enhanced Raman scattering (TERS) and heated by resonant excitation with var…
View article: Raman Sideband Thermometry of Single Carbyne Chains
Raman Sideband Thermometry of Single Carbyne Chains Open
We demonstrate Raman sideband thermometry of single carbyne chains confined in double-walled carbon nanotubes. Our results show that carbyne's record-high Raman scattering cross section enables anti-Stokes Raman measurements at the single …
View article: Localization of lattice dynamics in low-angle twisted bilayer graphene
Localization of lattice dynamics in low-angle twisted bilayer graphene Open
View article: Experimental data for "Localization of lattice dynamics in low-angle twisted bilayer graphene"
Experimental data for "Localization of lattice dynamics in low-angle twisted bilayer graphene" Open
This repository contains the experimental data related to the article "Localization of lattice dynamics in low-angle twisted bilayer graphene" and is provided to the reader under the “data availability” directive. the files have been organ…
View article: Experimental data for "Localization of lattice dynamics in low-angle twisted bilayer graphene"
Experimental data for "Localization of lattice dynamics in low-angle twisted bilayer graphene" Open
This repository contains the experimental data related to the article "Localization of lattice dynamics in low-angle twisted bilayer graphene" and is provided to the reader under the “data availability” directive. the files have been organ…
View article: Distribution and chemical composition of crystals in Hevea brasiliensis (Willd. ex Adr Jussieu) Muell. Arg. wood.
Distribution and chemical composition of crystals in Hevea brasiliensis (Willd. ex Adr Jussieu) Muell. Arg. wood. Open
In order to comprehend the intraspecific changes that occur in the rubber tree wood from São Paulo and Paraná (Brazil), the distribution and the chemical composition of crystals were investigated by morphological and chemical analyses usin…
View article: Linkage Between Micro- and Nano-Raman Spectroscopy of Defects in Graphene
Linkage Between Micro- and Nano-Raman Spectroscopy of Defects in Graphene Open
On nanomaterials characterization, the evolution from the broadly utilized micro-Raman spectroscopy to a nanoscale regime is taking place with the improvements in tip-enhanced Raman spectroscopy (TERS). It is not clear, however, to which e…
View article: Lattice dynamics localization in low-angle twisted bilayer graphene
Lattice dynamics localization in low-angle twisted bilayer graphene Open
A low twist angle between the two stacked crystal networks in bilayer graphene enables self-organized lattice reconstruction with the formation of a periodic domain. This superlattice modulates the vibrational and electronic structures, im…
View article: Photoinduced electron transfer dynamics of AuNPs and Au@PdNPs supported on graphene oxide probed by dark-field hyperspectral microscopy
Photoinduced electron transfer dynamics of AuNPs and Au@PdNPs supported on graphene oxide probed by dark-field hyperspectral microscopy Open
The time scale for interfacial photoinduced electron transfer (PeT) in plasmonic nanoparticles is not well established and the details are still under debate.
View article: Impact of substrate on tip-enhanced Raman spectroscopy: A comparison between field-distribution simulations and graphene measurements
Impact of substrate on tip-enhanced Raman spectroscopy: A comparison between field-distribution simulations and graphene measurements Open
Tip-enhanced Raman spectroscopy (TERS) has reached nanometer spatial resolution for measurements performed at ambient conditions and subnanometer resolution at ultrahigh vacuum. Super-resolution (beyond the tip apex diameter) TERS has been…
View article: Plasmon‐Tunable Tip Pyramids: Monopole Nanoantennas for Near‐Field Scanning Optical Microscopy
Plasmon‐Tunable Tip Pyramids: Monopole Nanoantennas for Near‐Field Scanning Optical Microscopy Open
Squeezing optical fields into nanometer scale is the key step to perform spatially resolved near‐field optics. In scattering‐type near‐field optical microscopy, this task is accomplished by nanoantennas that convert propagating radiation t…
View article: Plasmon 3D Electron Tomography and Local Electric-Field Enhancement of Engineered Plasmonic Nanoantennas
Plasmon 3D Electron Tomography and Local Electric-Field Enhancement of Engineered Plasmonic Nanoantennas Open
Plasmonic nano-antennas are pushing the limits of optical imaging resolution capabilities in near-field scanning optical microscopy (NSOM). Accordingly, these techniques are driving the basic understanding of photonic and optoelectronic na…
View article: Study of Growth Properties of InAs Islands on Nucleation Sites Defined by Focused Ion Beam
Study of Growth Properties of InAs Islands on Nucleation Sites Defined by Focused Ion Beam Open
This work describes morphological and crystalline properties of the InAs islands grown on templates created by focused ion beam (FIB) on indium phosphide (InP) substrates. Regular arrangements of shallow holes are created on the InP (001) …
View article: Interaction between lamellar twinning and catalyst dynamics in spontaneous core–shell InGaP nanowires
Interaction between lamellar twinning and catalyst dynamics in spontaneous core–shell InGaP nanowires Open
Micron-long -oriented III–V nanowires are made possible due to lamellar twinning and stacking faults which stabilize the {111}A facet at the catalyst–nanowire interface.