Significant efforts have been made to design and fabricate nanotube-based composites since the pioneering report on carbon nanotube (CNT)-polymer composites by Ajayan et al. [1] These composites are expected to have useful electrical and optical properties, thermal conductivity, and superior mechanical strength compared to unprocessed polymers. [2,3] Polyaniline (PANI), a typical electroconductive polymer, is a promising candidate for the fabrication of nanotube-based composites due to its stability and redox properties. Significant progress has been achieved with respect to the processing and property improvements of PANI-CNT composites. [4] For real-device applications, the two important factors-functionality and processabilityshould be considered. These parameters primarily depend on the efficiency of interactions between the nanotubes and polymer chains within a composite material. To enhance these interactions, the PANI-CNT composites are typically fabricated by in situ polymerization.
Boron nitride nanotubes (BNNTs), which are structurally similar to CNTs, have been predicted to behave like wideband-gap semiconductors independent of radius, chirality, and the number of tubular shells. [5] Interestingly, the electrical polarization induced by broken symmetry along the BNNT axis has been predicted in a theoretical study; this is quite distinct from the case of CNTs. [6] Moreover, BNNTs have superb mechanical properties, thermal conductivity, and resistance to oxidation at high temperatures. [7][8][9][10][11] These factors may promote effective BNNT usage in nanocomposites. However, to the best of our knowledge, no BNNTpolymer composites have been reported to date. Studies of BNNTs-polymer composites are absent because it is extremely difficult to obtain a highly pure BNNT phase with a yield high enough to fabricate and test a composite