SUPERSHARP TERS PROBES

High Reliability and Outstanding Performance for Tip enhanced Raman Spectroscopy

TERS Tips MORPHOLOGY

Next-tip has patented a new morphology of the metal coating on an AFM probe. This morphology is based on the deposition of metal nanoparticles by Ion Cluster Source.

The control of the deposit of these nanoparticles creates on the tip a new morphology different from those found in the literature. This morphology is characterized by the following features:

nanoparticles coating metal Tip enhanced Raman Spectroscopy TERS probe
nanoparticles coating Apex metal Tip enhanced Raman Spectroscopy TERS

Apex features

Widening at the apex

Local Surface Plasmon Resonance (LSPR) effect is the main source of enhancement for TERS and it strongly depends on the morphology of the metal nanostructures. The morphology of metal nanoparticles including the size, shape, and roughness significantly influences the surface enhancement effect in TERS. The apex of our  AFM tips is an irregular nanostructure formed by an aggregate of gold nanoparticles with a shape similar to an ‘artichoke’

Apex nanoparticles coating metal Tip enhanced Raman Spectroscopy TERS probe
nanoparticles sharp tip lightning rod effect high resolution TERS probe

Sharpness in the tip

The nanostructure formed in the apex finished by one or two nanoparticles provides sharpness. The final nanoparticles on the apex of the AFM tip give a good lateral resolution and increase the lightning rod effect in which the sharp tip apex causes the electric field to be concentrated at this point.

coating of nanoparticles forms branch-shape effective plamonic antena SEM image

Coating side features

The dense coating of nanoparticles forms branches on the tip surface, increasing the roughness. This group of nanoparticles or heterogeneity of the coating tip acts as an effective plasmonic antenna to receive and transmit light at the nanoscale.

coating of nanoparticles forms branch-shape effective plamonic antena
coating of nanoparticles forms branch-shape effective plamonic antena

Tip Enhanced Raman Spectroscopy PERFORMANCE

Outstanding performance of Next-Tip TERS probes are related to their morphological features.

The design of these probes have been developed to match the best AFM performance and the most powerfull RAMAN signal.

apex gold nanoparticles enhance the local surface plasmon resonance LSPR effect

High resolution

The great control of the coating process allows high resolution on robust probes with a high degree of reproducibility. In addition, this coating process allows the placement of one or two nanoparticles in the apex of the tip, achieving the high lateral resolution. Measurements show AFM resolution less than 5nm and TERS resolution less than 10nm.

Enhancement factor and contrast

The enhancement factor (EF) value is quoted to quantify the enhancement of the Raman signal by the enhancemend electric field at the tip apex and it is based in contrast value. The contrast value is calculated using the experimental data collected from the near-field scan and the far-field scan at the same spatial location. TERS probe of gold guarante to achive a contrast higher than 20 and silver TERS probe higher than 40. These values lead to an enhancement factor up to 105-106 with  Next-tip TERS probes.

Lifetime

The life of silver TERS tips is protected with a second layer of gold nanoparticles on the silver metal, preserving the properties of both metals to enhance the effect of plasmon. This dense gold nanoparticle coating guarantees a thicker layer of metal that significantly improves the durability of this type of probes. In addition, the irregularities formed by the nanoparticles along the tip extend its useful life after being deformed by the Raman laser.

apex gold nanoparticles coating metal Tip enhanced Raman Spectroscopy TERS
coating of nanoparticles forms branch-shape effective plamonic antena

Tip Enhanced Raman Spectroscopy PRODUCTS

GOLD Core TERS Probes

  • 5 box: 1.491€ 1.695€
  • 10 box: 2.635€ 2.995€
Buy

NT-TERS-Au-85 GOLD. Force Modulation with Real Tip Visibility

Cantilever main technical data

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

TERS Tips Performance

  • Enhancement factor ~ 106
  • Lateral resolution in TERS: <5nm
  • Contrast ~ 20
  • Enhancement proved at 633nm laser excitation
  • Based on commercial AFM cantilevers
  • 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-TERS-Au-335 GOLD. Tapping Mode AFM Probe with Real Tip Visibility

Cantilever main technical data

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

TERS Tips Performance

  • Enhancement factor ~ 106
  • Lateral resolution in TERS: <5nm
  • Contrast ~ 20
  • Enhancement proved at 633nm laser excitation
  • Based on commercial AFM cantilevers
  • 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)

SILVER Core TERS Probes

  • 5 box: 1.667€ 1.895€
  • 10 box: 2.987€ 3.395€
Buy

NT-TERS-Ag-85 Silver. Force Modulation with Real Tip Visibility

Cantilever main technical data

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

TERS Tips Performance

  • Enhancement factor ~ 106
  • Lateral resolution in TERS: <5nm
  • Contrast ~ 40
  • Enhancement proved at 633nm laser excitation
  • Based on commercial AFM cantilevers
  • Notable lifetime due to the irregularity and gold layer

 

 

Other technical data

AFM Tip
Shape
Visible
Tip Radius
<5nm
Coating
Silver and 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-TERS-Ag-335 Silver. Tapping Mode AFM Probe with Real Tip Visibility

Cantilever main technical data

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

TERS Tips Performance

  • Enhancement factor ~ 106
  • Lateral resolution in TERS: <5nm
  • Contrast ~ 40
  • Enhancement proved at 633nm laser excitation
  • Based on commercial AFM cantilevers
  • Notable lifetime due to the irregularity and gold layer

 

 

Other technical data

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

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