Rapidly jetting precursors in floating catalyst chemical vapor deposition produces monodisperse, metallic single-wall carbon nanotube fibres, irrespective of sulfur source.

Few-wall carbon nanotube (CNT) textiles with unparalleled graphitic perfection and a solitary, prominent radial breathing mode (RBM) associated with metallic chirality have been mechanically stretched in chlorosulfonic acid (CSA) to a degree so far unseen in CNT textiles (150 to 250% of original length) with notably little tension required. This dramatically enhanced their microstructural alignment and density and, after most of the residual CSA was removed by a vacuum bake, the de-doped fiber's electrical conductivity was found to be 45% greater than single-crystal graphite-a significant milestone for CNT conductor development towards graphitic intercalation compounds (GICs) and traditional metals. Correlation tables and validated, multivariate statistical models show that conductivity is overwhelmingly linked to stretching degree, although eventually saturates near single-crystal graphite levels, implying the existence of a maximum undoped conductivity. The degree of stretching within CSA is correlated with the original mechanical properties (tenacity, elongation-to-break, and linear density); the Raman G':G ratio and the upper-end oxidation temperature in thermogravimetric analysis also predict the best results. Less graphenically pristine CNT materials stretch to a lower degree in CSA, similar to previous reports. This study highlights the importance of post-synthesis processing to achieve superior performance in carbon nanotube textile materials.

BaTiO 3 (BTO) thin film capacitors were deposited on Ni substrate using rf magnetron sputtering. Microstructural studies by x-ray diffraction and transmission electron microscopy reveal that the as-grown BTO films have the columnar structure and the good interface structure. Postdeposition anneal results in the recrystallization of BTO films. The electrical measurements exhibit that the BTO films have high capacitance densities and low leakage currents.