Super-long barnesite Na2V6O16·3H2O nanobelts for aligned film electrodes with enhanced anisotropic electrical transport

Abstract

Developing a novel, aligned super-long nanobelt film electrode is essential for achieving outstanding electrical transport properties. However, pursuing a convenient way to fabricate an aligned super-long nanobelt film electrode has been a challenge so far. Herein, the aligned super-long barnesite Na₂V₆O₁₆·3H₂O nanobelt film electrode is realized as a dense and thick film for the first time by a convenient solution route, providing a new strategy to synthesize aligned nanobelt film electrodes. The Na₂V₆O₁₆·3H₂O nanobelts with lengths of 100–200 μm growing along [010] are fabricated successfully, and the super-long single nanobelt enables the first investigation of electrical transport property. Encouragingly, the individual nanobelt with aspect ratios exceeding 1000 has a high conductivity of ∼100 S m⁻¹. Furthermore, the synthetic aligned super-long barnesite Na₂V₆O₁₆·3H₂O nanobelt film electrode displays an enhanced anisotropic electrical transport property and good electrical conductivity, presenting an ideal candidate as a nanoelectrode.