Structural control and local optical property of carbon nanotube adsorbed on the substrates

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Optical properties of carbon nanotubes (CNTs) are currently the focus of intense study in relation to the miniaturization of electronic devices. In order to develop electronics based on the CNT, the nano-scale analysis and control of the individual CNT are indispensable. Here, we used scanning tunneling microscopy (STM) to create an atomic-scale defect on the CNT chain. Furthermore, the optical property of the artificial defect formed on CNT has been discussed using the STM tip-induced light emission (STM-LE) method. The dry contact transfer (DCT) method was used to deposit CNTs on the substrates without exposing the sample to air. We have developed this method in order to increase the density of CNT on the substrate. The artificial defect was created on the CNT by positioning the STM tip above the CNT followed by applying the voltage pulse. The light emitted from the SWCNT and the defect was found to be relatively weak compared with that from Au. Moreover, the intense peak observed in the STM-LE spectrum of the intact CNT is shifted to higher energy when the STM-LE was obtained at the defect site of CNT. This would be ascribed to the change in the electronic states of CNT, which was induced by the STM tip.