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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Near Simultaneous Laser Scanning Confocal and Atomic Force Microscopy (Conpokal) on Live Cells
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Enhancing Raman signals with an interferometrically controlled AFM tip.

Matti Oron-Carl1, Ralph Krupke

  • 1Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany.

Nanotechnology
|September 19, 2013
PubMed
Summary

We upgraded a Raman microscope into a tip-enhanced Raman scattering (TERS) system for enhanced nanoscale analysis. This cost-effective upgrade enables detailed material characterization and local conductivity measurements.

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Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Confocal Raman microscopy offers valuable chemical information but lacks nanoscale resolution.
  • Tip-enhanced Raman spectroscopy (TERS) provides high spatial resolution by utilizing a sharp metallic tip for near-field enhancement.
  • Commercial TERS systems are often expensive and may require specialized setups.

Purpose of the Study:

  • To demonstrate a cost-effective upgrade of a commercial confocal Raman microscope into a TERS system.
  • To validate the enhanced system's performance through measurements on model materials.
  • To integrate local conductivity measurements with TERS for comprehensive nanoscale characterization.

Main Methods:

  • Integration of an interferometrically controlled atomic force microscope (AFM) into an upright confocal Raman microscope.
  • Near-field detection using a sharp metallic tip for signal enhancement.
  • TERS measurements on thin PEDOT:PSS films and carbon nanotube devices.
  • Simultaneous local conductivity, Raman, and topography mapping.

Main Results:

  • Achieved Raman signal enhancement factors of 2-3 on PEDOT:PSS films.
  • Observed Raman enhancement factors of 5-6 on carbon nanotubes.
  • Demonstrated correlation between local conductivity, Raman spectra, and topography on nanotube devices.
  • Validated the feasibility and effectiveness of the upgraded TERS system.

Conclusions:

  • The demonstrated upgrade provides a significantly cheaper alternative to commercial TERS systems.
  • The upgraded system enables high-resolution chemical and electrical characterization at the nanoscale.
  • This approach facilitates advanced materials analysis and device investigation.