Synthesis and transport properties of La0.67Sr0.33MnO3 conformally-coated on carbon nanotubes

We report for the first time the fabrication of nanostructured ferromagnetic lanthanum strontium manganite La0.67Sr0.33MnO3 (LSMO) conformally coated onto bamboo-like carbon nanotubes (BCNTs) by pulsed laser deposition. Scanning electron microscopy revealed that one-dimensional LSMO/BCNTs with diameters ranging from 100-160 nm and lengths over 10 μm were obtained. Line-scanned energy-dispersive X-ray spectroscopy profiles, selected area electron diffraction rings, and energy-filtered transmission electron microscopy maps provided further insight into the hybrid nanostructures. LSMO/BCNT and BCNT were also investigated via in situ electrical probing in a transmission electron microscope using a piezo-driven scanning tunneling microscopy holder. Modeling of the I-V characteristics of individual hybrid nanotubes yielded the resistivity, bandgap, and electron density of LSMO and BCNT. The results show that the transport properties of LSMO/BCNT are superior to those of BCNT. This research advances the integration of oxide materials and carbon nanotubes, bringing forth new avenues for miniaturization and fabrication of one-dimensional core-multishell materials with multifunctional properties that can be used as building blocks in nanodevices.