NANO-IR PROBES PERFORMANCE

The principle of nanoIR spectroscopy is based on a sharp metal-coated tip upon which the excitation laser beam falls.

The electromagnetic field at the tip apex is confined and enhanced due to a combination of localized surface plasmon resonance (LSPR) and lightning rod effects. For this reason, the probe is the main and key element, as it directly influences spatial resolution, reproducibility and enhancement of the signal generated at the sample surface.

Higher signal and SNR in nano-FTIR 

Next-Tip probes provide a higher IR signal than standard arrow tips usually employed in nano-FTIR and s-SNOM systems. The spectra are from a rhyolitic (high silicon oxide content) volcanic glass referenced to either gold or silica. Amplitude (left) and phase (right) spectra have been collected from the same samples, under the same measurement conditions, using standard arrow probe (blue) and Next-Tip probe (orange). Better quality data are acquired with the Next-Tip tips.

Study carried out in collaboration with the Department of Geosciences, Stony Brook University (US).

Higher SNR in nano-FTIR

Spectra acquired with Next-Tip probes present much lower background contribution than those obtained with the standard Pt/Ir-coated tips, leading to a higher signal-to-noise ratio and clearer spectra.

The graph shows 3rd order demodulated nano-FTIR absorption spectra of PMMA recorded in 13.6 seconds with both types of probes.

Higher spatial resolution in contact AFM-IR

E. coli bacterium s-snom and topography images

Study carried out in collaboration with the Switch Laboratory in Catholic University of Leuven (Belgium).

The special morphology of Next-Tip probes allows for a higher spatial resolution in AFM-IR images and higher signal IR, in contact mode.

This is an E. coli bacterium exposed to heat shock, which results in protein aggregation. The aggregates naturally migrate to the cell poles due to passive diffusion and their IR absorbance is characterized by increased absorption in the regions 1620-1630 cm-1.

Higher spatial resolution in tapping AFM-IR

This block copolymer, d-PS-b-PMMA, has been measured with a Next-Tip probe. The pictures show the high spatial resolution and the AFM image quality in topography (a), phase (b) and chemical maps from PMMA at 1726 cm-1 (c) and PS at 1492 cm-1 (d). The sample was measured in tapping AFM-IR. In addition, the profiles on the right show that the chemical resolution is better than 5nm.

Higher signal in contact AFM-IR

The  contact AFM-IR  data correspond to Mid-IR on individual 5nm-thick lipid cell membrane patches embedding transmembrane proteins (bacteriorhodospin) deposited on template stripped gold substrate.

Next-Tip probe shows much higher field enhancement and field confinement in the nanogap than a standard evaporated-gold tip (the field enhancement can be roughly estimated by the ratio of amide-i/amide-II peak intensities).

Study carried out in collaboration with the Department of Physics in Sapienza University of Rome (Italy).

Better images in Terahertz range nanoscopy

Next-Tip probes are also useful for THz nanoscopy measuring a Bi2Se3 flake. The use of our probes, in tapping mode, combines the highest SNR on the market with exceptional resolution. As can be seen in AFM topographies and near-field amplitude images, both Next-Tip probe geometries (elephant and pyramid) are much sharper than those collected with commercial tips of similar apex radius.

Study carried out in CNR-Nano Science Institute NEST, Pisa (Italy).

Users’ Reviews

It did give really nice signal, comparable and better than our usual Pt/Ir or PtSi SNOM tips.

O. Kazakova’s Group from National Physical Laboratory (U.K.)Bruker’s Anasys NanoIR2-s instrument

We have collected some data and I am very happy with the results. Qualitatively, the signal to noise is comparable to or better than our standard arrow tips. For some of my upcoming work, the very high spatial resolution enabled by the Next-Tip probes will be critically important

Timothy Glotch from Stony Brook UniversityNeaspec NeaSNOM Nano-IR Instrument

The scattered signal on a gold substrate is significantly greater than that from PtIr, almost by one order of magnitude when scaled by incident power. For visible sSNOM, the tips performed very well in terms of signal compared to the standard arrow PtIr tips

Basov’s group from Columbia University

The probes do seem to have a higher spatial resolution than the probes we are used to.

Wouter Duverger from KU LeuvenBruker’s Anasys nanoIR3 system

We found very nice images on your elephant trunk tip, even much better than conventional tips at 2 THz and at 3 THz

M. Vitiello from CNR nano

We have nice spectroscopy and imaging data to show, taken with your tips on purple membranes. we find a clear advantage in the geometry of the field-enhancement pattern at the tip apex, which is crucial for high-lateral-resolution IR nanospectroscopy

M. Ortolani from Sapienza University

Nano-IR PRODUCTS

Elephant trunk shape

Nano-IR gold probes

 

  • 5 probes box: 945€
  • 10 probes box: 1.795€

If you belong to a research center or university, please, ask for your introductory offer.

NT-IR-E-85

Cantilever main technical data

  • Resonance Frequency: 85 KHz
  • Force Constant: 2.8 N/m
  • Length: 240 µm

Tips Performance

  • Lateral resolution: <5nm
  • Notable lifetime due to the irregularity

 

 

Other technical data

AFM Tip
Shape
Visible
Tip Radius
<5nm
Coating
Gold Nanoparticles
AFM Cantilever
Resonance Frecuency
85 KHz (50 - 130 kHz)
Force constant
2.8 N/m (0.7 - 9 N/m)
Length
240 µm (230 - 250 µm)
Width
35 µm (30 - 40 µm)
Thickness
3 µm (2 - 4 µm)

NT-IR-E-335

Cantilever main technical data

  • Resonance Frequency: 335 KHz
  • Force Constant: 45 N/m
  • Lenght: 160 µm

Tips Performance

  • Lateral resolution: <5nm
  • Notable lifetime due to the irregularity

 

 

Other technical data

AFM Tip
Shape
Visible
Tip Radius
<5nm
Coating
Gold Nanoparticles
AFM Cantilever
Resonance Frecuency
335 KHz (210 - 490 kHz)
Force constant
45 N/m (12- 110N/m)
Length
160 µm (150 - 170 µm)
Width
45 µm (40 - 50 µm)
Thickness
4.6 µm (3.6 – 5.6 µm)

Pyramid shape

Nano-IR gold probes

(with alignment grooves)

  • 5 probes box: 945€
  • 10 probes box: 1.795€

If you belong to a research center or university, please, ask for your introductory offer.

NT-IR-P-75

Cantilever main technical data

  • Resonance Frequency: 75 KHz
  • Force Constant: 2.8 N/m
  • Length: 225 µm

Tips Performance

  • Lateral resolution: <5nm
  • Notable lifetime due to the irregularity

 

 

Other technical data

AFM Tip
Shape
Standard
Tip Radius
<5nm
Coating
Gold Nanoparticles
AFM Cantilever
Resonance Frecuency
75 KHz (45 - 115 kHz)
Force constant
2.8 N/m (0.5 - 9.5 N/m)
Length
225 µm (215 - 235 µm)
Width
28 µm (20 - 35 µm)
Thickness
3 µm (2 - 4 µm)

NT-IR-P-330

Cantilever main technical data

  • Resonance Frequency: 330 KHz
  • Force Constant: 42 N/m
  • Lenght: 125 µm

Tips Performance

  • Lateral resolution: <5nm
  • Notable lifetime due to the irregularity

 

 

Other technical data

AFM Tip
Shape
Standard
Tip Radius
<5nm
Coating
Gold Nanoparticles
AFM Cantilever
Resonance Frecuency
330KHz (204 - 497 kHz)
Force constant
42 N/m (10- 130N/m)
Length
125 µm (115 - 135 µm)
Width
30 µm (22.5 - 37.5 µm)
Thickness
4 µm (3 – 5 µm)

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