Comparative Study on MoO₃ and H<i>_x</i>MoO₃ Nanobelts: Structure and Electric Transport

Abstract

In this study, the suspension of MoO 3 nanobelts was first prepared in a hydrothermal way from Mo powders and H 2 O 2 solution, which could be transformed into the suspension of H x MoO 3 nanobelts under an acidic condition using N 2 H 4 ·H 2 O as the reducing agent. Three paper-form samples made from MoO 3 and H x MoO 3 nanobelts (low or high hydrogen content) were then fabricated via a vacuum filtration method, followed by their structural comparative analysis such as FESEM, XRD, Raman spectra, and XPS, etc. The measurement of electric resistances at room temperature shows that the conductance of H x MoO 3 nanobelts is greatly improved because of hydrogen doping. The temperature-dependent resistances of H x MoO 3 nanobelts agree with the exponential correlation, supporting that the conducting carriers are the quasi-free electrons released from Mo 5+ . In addition, the formation process of H x MoO 3 nanobelts from MoO 3 nanobelts is also discussed.