Epitaxial growth of aligned MoS2 via One-step CVD method for realizing the ultrasonic field-driven direct current nanogenerators

Molybdenum disulfide (MoS2) is widely used in energy harvesting devices due to its high carrier mobility and semiconductor properties. However, the preparation of high-quality MoS2 still faces significant challenges. In this work, we present a one-step chemical vapor deposition method for the preparation of large-size MoS2 nanosheets with an orientation rate of over 70%. The one-step preparation method is more cost-effective and time-efficient compared to conventional techniques. The aligned MoS2 nanosheets demonstrate a significant capacity for charge transfer in triboelectric devices. Herein, we propose a concept of MoS2 as the charge transport layer for nanogenerator arrays for hybrid energy harvesting and high-performance direct output. Furthermore, the current density of the device exceeds 10 A/m2 under ultrasonic excitation. Consequently, this finding is anticipated to offer new insights into applications such as mechanical energy conversion and MoS2 charge transport.