| Author(s): |
Katie Hurst; Anne Dillon; John H. Lehman; |
| Title: |
Absolute Absorptivity of Single-walled Carbon Nanotubes Employing a Pyroelectric Detector |
| Published: |
December 20, 2006 |
| Abstract: |
Optical properties are important for determining fundamental characteristics of carbon single-walled nanotube (SWNT) samples including purity, chirality, and tube diameter. Previously, we have estimated the volume fraction of metallic versus semiconducting tubes for highly purified SWNT bucky-paper on a pyroelectric detector from spectral responsivity measurements and an effective medium approximation to determine the dielectric function.1 Pyroelectric detector-based measurements are based on the thermalization of photons within the SWNT coating and provide a robust technique for measuring absolute absorptivity at normal incidence. Alternatively, we perform transmissivity measurements of SWNTs by employing a gold black coated pyroelectric detector. Spectral responsivity measurements are made by direct substitution against a NIST calibrated detector such that quantitative changes in the volume fraction and purity of SWNT samples are revealed. These results will be compared to specular transmissivity measurements made by UV-VIS spectrometry. Raman spectroscopy will also serve to verify nanotube properties. 1.K.E.H. Gilbert, J.H. Lehman, A.C. Dillon and J.L. Blackburn Appl. Phys. Lett. 88, 143122 (2006). |
| Citation: |
APS meeting |
| Keywords: |
carbon nanotubes, pyroelectric detector, coatings, responsivity, Raman spectroscopy |
| Research Areas: |
Optoelectronics |
