A multimodality imaging technique integrating atomic force, polarized Raman, and fluorescence lifetime microscopy and a 2D autocorrelation image analysis is applied to study the properties of a mesoscopic heterostucture of nanoscale materials. This approach enables simultaneous measurement of fluorescence emission and Raman shifts from a quantum dot (QD) - single-walled carbon nanotube (SWCNT) complex. Nanoscale physical and optoelectronic characteristics are observed including local QD and SWCNT concentrations, orientation-dependent polarization anisotropy of the SWCNT Raman shifts, and charge transfer from photo-excited QDs to covalently conjugated SWCNTs. Our approach allows for the measurement of mesoscopic characteristics that bridge the properties observed in bulk and single nanotube measurements. This methodology provides fundamental understanding of the charge and energy transfer between nanoscale materials, which is critical for the development of sensors and optoelectronic devices achieved by the assembly of nanoscale building blocks.
Citation: ACS Nano
Pub Type: Journals
nanoscale multimodal imaging, nano-hybrid, quantum dot, carbon nanotube, hyperspectral imaging