Direct Imaging of Room Temperature Optical Absorption with Subnanometer Spatial Resolution

作者：Scott Gregory; Ashtekar Sumit; Lyding Joseph; Gruebele Martin^*

来源：Nano Letters, 2010, 10(12): 4897-4900.

DOI：10.1021/nl102854s

• Carbon nanotubes
• scanning tunneling microscopy
• soliton
• spectroscopy
• exciton

Optical,absorption can detect individual molecules and nanostructures even in dissipative or strongly quenching environment where fluorescence signals are weak here we image optical absorption of individual carbon nanotubes with subnanometer resolution We show that we can discriminate adjacent nanotubes on a length scale far below the diffraction limit Then we compare optical absorption imaging of a defect in a single carbon nanotube (CND with conventional scanning tunneling microscopy (STM) and conventional current voltage scan (I-V) bandgap profiles We directly visualize the penetration depth sigma' = 0 9 +/- 0 3 nm of the CNT exciton state into the smaller bandgap region of the defect and derive a size sigma = 1 8 +/- 0 6 nm for the exciton state Optical absorption provides a spectroscopic map of molecules simultaneously with conventional STM

• 出版日期2010-12