Abstract
We present a method for synthesizing inorganic-thin-layer-coated carbon nanotubes by pulsed laser deposition. Isolated multi-walled carbon nanotubes (MWNTs) were coated with inorganic thin layer in a multishell form. The product showed that various inorganic thin layers were uniformly wrapped around a MWNT, and reflected the shape of the MWNT. The thickness of the coated thin layer was precisely controlled with nanometer accuracy. Moreover, a metal-coated carbon nanotube (CNT) tip for scanning tunneling microscope (STM) has been developed. The observation of a Si(111)-7x7 surface using the metal-coated CNT tip demonstrated stable atomic imaging and potentiality of scanning tunneling spectroscopy (STS) measurement, which can be achieved from the pristine stage. It was demonstrated that the mechanical robustness and flexibility of the tip were maintained by virtue of the thin coated layer.
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