Single-crystalline Ag2V4O11nanobelts: hydrothermal synthesis, field emission, and magnetic properties

A large number of single-crystalline Ag 2 V 4 O 11 nanobelts with thickness of 10–30 nm, width of 70–200 nm, and lengths of 2–5 µm have been successfully synthesized by a hydrothermal method. The morphologies and structures of the nanobelts were characterized by x-ray powder diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and thermal gravimetric analysis. The magnetic measurement data showed that Ag 2 V 4 O 11 nanobelts are paramagnetic materials. The nanobelts exhibited an electronic emission turn-on field of 28.9 V µm −1 , which is the expected macroscopic field required to produce a current density of 10 µA cm −2 . On the basis of the analytical data, it was observed that Ag 2 V 4 O 11 nanobelts could serve as a novel candidate for a future field emitter.