Description

This fellowship opportunity supports postdoctoral research at the National Institute of Standards and Technology (NIST) focused on the study of carbon nanostructures using resonant Raman spectroscopy. The research investigates multibody effects in the optical spectra of single-walled carbon nanotubes (SWCNTs) and related materials. Key techniques include resonance enhancement of the Raman scattering intensity of the radial breathing mode in SWCNTs, which serves as a probe for tube chirality and one-dimensional electronic structure.

The research is conducted using a state-of-the-art confocal magneto-Raman microscope capable of tunable laser excitation from near-infrared to ultraviolet wavelengths, operating over a wide temperature range (4.2 K to 300 K) and magnetic fields up to 8 Tesla. The system includes a triple grating spectrometer with high Raleigh rejection, enabling low-frequency and Terahertz Raman spectroscopy.

As part of a multidisciplinary NIST team, fellows will contribute to nanometrology efforts that provide valuable characterization data on sample quality, purity, alignment, and physical features such as diameter and length. The program studies various SWCNT sample types including bulk, single, DNA-wrapped, suspended, and nanoparticle-functionalized nanotubes. Complementary research on graphene’s unique optical properties is also integral, involving combined Raman, scanning tunneling microscopy (STM), and quantum Hall effect measurements, along with device fabrication on substrates like SiC and SiO2.

This research benefits academic, industrial, and nano-environmental, health, and safety (Nano EHS) communities by advancing fundamental understanding and measurement science of carbon nanomaterials.