The Krauss Group:
The Krauss Group:
Nanoscale Materials and Devices
Nanoscale Materials and Devices
"Where Size Matters"

Research
Research Topics:

  • Semiconductor Nanocrystals
  • Pathogen Detection
  • Label-free DNA Microarray

  • Carbon Nanotubes
  • Ultrafast Electronics
  • Single Nanotube Spectroscopy
  • Single Protein Folding

  • Single Nanoparticle Spectroscopy
  • Force Microscopy of CdSe Nanorods
  • PbSe Nanocrystal Spectroscopy
  • Semiconductor Nanocrystal Photonics
    • Single Carbon Nanotube Luminescence Spectroscopy

    Single walled carbon nanotubes (SWNTs) have remarkable properties and many potential applications in different fields of both science and technology, thus inspiring intensive research on this tubular graphene wires with 1 nm diameter and 1000 nm length during the past decade. Nanotubes can have either metallic or semiconducting properties depending on their diameter and helicity. While metallic nanotubes are very good electron field emitters, semiconducting SWNTs offer stable and tunable fluorescence in the Near-Infrared region (NIR). I investigate the Electronic and Optical properties of individual semiconducting SWNTs by means of spectroscopy. Due to limitations in the synthesis of individual SWNTs, my research starts with synthesis and dispersion, followed by characterization and finally spectroscopic measurements. Below is fluorescence and absorption spectra of a collection of individual SWNTs with different diameters.

    Fig. 1: Absorption (bottom graph) and fluorescence (top graph) spectra of a collection of individual SWNTs with different diameters. The three sets of data correspond to 3 different popular synthesis methods.