Investigation of local modification and luminescence of a carbon nanotube by scanning tunneling microscopy

Abstract

We have studied the nanoscale luminescence from a multiwalled carbon nanotube (CNT) adsorbed on Au(111) using a scanning tunneling microscope (STM). STM images revealed that a number of isolated chains of CNTs can be deposited by dry contact transfer while keeping the surface clean. By injecting tunneling electrons from the STM tip to the CNT, we observed STM light emission (STM-LE) from the CNT in the visible-light range, showing electronic transitions between the bands associated with the van Hove singularity in the density of states of the CNT. The STM-LE spectrum was obviously changed after introducing the local defect created by the STM tip, indicating the controllability of the nanoscale luminescence within a single chain of a CNT.

In Situ Observation of Atomic-Scale Growth of a NaCl Thin Crystal on Au(111) by Scanning Tunneling Microscopy

“…An electrochemically etched tungsten tip was used for STM. An Au(111) single crystal was cleaned by the standard procedure, that is, the repetition of Ar ion sputtering and annealing to 800 K until the cleanliness and crystallinity of the Au(111) surface were confirmed by STM . The STM image of Au(111) showing an atomic structure is presented in the inset of Figure a.…”

Thermally and photoinduced structural and chemical changes of a silver nanocube array on Au(111)

“…In addition, we chose the size of AgNC in terms of the resonance wavelength of AgNC's LSP mode. The Au(111) substrate was obtained by evaporating Au (purity, 99.99%) on a freshly cleaved mica surface under vacuum (3 Â 10 À4 Pa), followed by annealing at 500 C. [41][42][43] The 2D array of AgNCs was fabricated on Au(111) by the LB method. 27 We evaluated the shape and array structures of AgNCs by SEM (Hitachi High-tech, SU8000) and AFM (SII, SPI3700, contact mode).…”