Near-field infrared microscopy of nanometer-sized nickel clusters inside single-walled carbon nanotubes

Németh, Gergely; Datz, Dániel; Pekker, Áron; Saito, Tetsuya; Domanov, Oleg; Shiozawa, Hidetsugu; Lenk, Sándor; Pécz, B.; Koppa, Pál

doi:10.1039/c9ra07089c

Cited by 4 publications

(3 citation statements)

References 23 publications

(20 reference statements)

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“…Advances were made on plasmon-polariton modes in graphene, 4,5 phonon-polariton modes in hexagonal boron nitride (hBN) [6][7][8][9][10] and alpha-phase molybdenum trioxide (α-MoO 3 ) 11 and even the hybrid phonon-plasmon modes of stacked hBN-graphene systems. 12 In a previous publication 13 we identified clusters of a few hundred metal atoms in single-walled carbon nanotubes (SWNT) based on their free-electron (Drude) absorption.…”

Section: Graphical Toc Entrymentioning

confidence: 99%

Polaritonic Enhancement of Near-field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes

Datz,

Nemeth,

Pekker

et al. 2020

Preprint

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Near-field spectroscopy has been extensively applied recently to analyze collective optical properties of materials at the nanoscale. However, vibrations of small molecules were only recognizable in close proximity to a metallic resonator. We show that encapsulation in boron nitride nanotubes (BNNT) enhances the near-field vibrational spectra of C 60 fullerene, reaching a sensitivity limit of a few hundred molecules. Furthermore, products of chemical reactions inside the tubes can be identified, so long as their vibrational signatures lie in the polariton gap of the BNNT.

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Section: Graphical Toc Entrymentioning

confidence: 99%

Polaritonic Enhancement of Near-field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes

Datz,

Nemeth,

Pekker

et al. 2020

Preprint

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“…The application of ultrafast MIR lasers with high repetition rates for spectroscopy has enabled a variety of novel research topics, which have not been feasible before. Among many others, in vitro monitoring of structural processes in protein research at attomolar concentrations in far-field spectroscopy [1], or of individual protein complexes in near-field spectroscopy [2], monitoring the hydrogen diffusion into metal hydrides [3], or the characterization of novel materials for miniature optoelectronic devices in the fingerprint region [4][5][6][7] are just a few examples. The modern world is based on highly technical processes and their impact will further grow in search of solutions for renewable energy sources, environmentally friendly transportation, remote sensing, life sciences, or for the growing digitization.…”

Section: Introductionmentioning

confidence: 99%

Alignment-free difference frequency light source tunable from 5 to 20 µm by mixing two independently tunable OPOs

Mörz¹,

Steinle²,

Linnenbank³

et al. 2020

Opt. Express

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Tunable mid-infrared ultrashort lasers have become an essential tool in vibrational spectroscopy in recent years. They enabled and pushed a variety of spectroscopic applications due to their high brilliance, beam quality, low noise, and accessible wavelength range up to 20 µm. Many state-of-the-art devices apply difference frequency generation (DFG) to reach the mid-infrared spectral region. Here, birefringent phase-matching is typically employed, resulting in a significant crystal rotation during wavelength tuning. This causes a beam offset, which needs to be compensated to maintain stable beam pointing. This is crucial for any application. In this work, we present a DFG concept, which avoids crystal rotation and eliminates beam pointing variations over a broad wavelength range. It is based on two independently tunable input beams, provided by synchronously pumped parametric seeding units. We compare our concept to the more common DFG approach of mixing the signal and idler beams from a single optical parametric amplifier (OPA) or oscillator (OPO). In comparison, our concept enhances the photon efficiency of wavelengths exceeding 11 µm more than a factor of 10 and we still achieve milliwatts of output power up to 20 µm. This concept enhances DFG setups for beam-pointing-sensitive spectroscopic applications and can enable research at the border between the mid-and far-IR range due to its highly efficient performance.

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“…Advances were made on plasmon–polariton modes in graphene, , phonon–polariton modes in hexagonal boron nitride (hBN), − α-phase molybdenum trioxide (α-MoO 3 ), and even the hybrid phonon–plasmon modes of stacked hBN–graphene systems . In a previous publication, we identified clusters of a few hundred metal atoms in single-walled carbon nanotubes (SWNT) based on their free-electron (Drude) absorption. Molecular vibrations remained more elusive, with most reports being about polymer films, macromolecules, or molecules attached to an antenna surface. − Hyperspectral Raman measurements by Gaufrés et al set a lower detection limit of 10 α-sexithiophene molecules encapsulated in SWNTs, but direct IR detection at this scale has not yet been performed.…”

mentioning

confidence: 99%

Polaritonic Enhancement of Near-Field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes: Chemical Reactions in Confined Spaces

Datz

Németh

Walker

et al. 2021

ACS Appl. Nano Mater.

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Nanotubes have been extensively utilized as nanocontainers for molecules and as nanoreactors for chemical reactions in confinement, with the potential for applications in hydrogen storage and catalysis. We show that phonon polaritons of boron nitride nanotubes (BNNTs) enhance the near-field vibrational spectra of molecules in close proximity to the surface. By encapsulating C60 fullerene in BNNTs, we reach a sensitivity level of a few hundred molecules. Furthermore, we show by the photopolymerization of C60 that products of chemical reactions inside the tubes can be identified, so long as their vibrational signatures lie in the reststrahlen band of the BNNT.

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Near-field infrared microscopy of nanometer-sized nickel clusters inside single-walled carbon nanotubes

Abstract: Nickel nanoclusters grown inside single-walled carbon nanotubes (SWCNT) were studied by infrared scattering-type scanning near-field optical microscopy (s-SNOM).

Cited by 4 publications

References 23 publications

Polaritonic Enhancement of Near-field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes

Polaritonic Enhancement of Near-field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes

Alignment-free difference frequency light source tunable from 5 to 20 µm by mixing two independently tunable OPOs

Polaritonic Enhancement of Near-Field Scattering of Small Molecules Encapsulated in Boron Nitride Nanotubes: Chemical Reactions in Confined Spaces

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