Direct observation of the strong interaction between carbon nanotubes and quartz substrate
Single-walled carbon nanotube, quartz wafer, Raman spectroscopy, G-band “up-shift”, chemical vapor deposition (CVD)
We present a chemical vapor deposition (CVD) method for the growth of uniform single-walled carbon nanotube (SWNT) arrays on a stable temperature (ST)-cut single crystal quartz substrate using a mixture of methanol and ethanol as carbon source. It is found that introducing methanol during the growth can improve the density and the length of the well-aligned SWNTs in the arrays as well as increase the SWNT/quartz interaction. Obvious “up-shifts” of G-band frequencies in the Raman spectra have been found for the aligned SWNTs. A welldesigned control experiment shows that the G-band “up-shifts” originate from the strong interaction between SWNTs and the quartz substrate. It is believed that exploring this interaction will help to elucidate the growth mechanism; ultimately, this will help realize the promise of controlling the chirality of SWNTs.
Tsinghua University Press
Lei Ding,Weiwei Zhou,Thomas P. McNicholas,Jinyong Wang,Haibin Chu,Yan Li,Jie Liu, Direct observation of the strong interaction between carbon nanotubes and quartz substrate. NanoRes.2009, 2: 903-910