Tuning of the temperature dependence of the resonance frequency shift in atomically thin mechanical resonators with van der Waals heterojunctions. (3rd September 2018)

• Record Type: Journal Article
• Authors: Inoue, Taichi; Mochizuki, Yuta; Takei, Kuniharu; Arie, Takayuki; Akita, Seiji
• Is Part Of: 2D materials. Volume 5:Number 4(2018)
• Publication Date: 2018-09-03
• Subjects: nanomechanical resonator -- thermal expansion coefficient -- van der Waals heterojunction -- graphene -- MoS2; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/aad864
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: Atomically thin two-dimensional (2D) mechanical resonators should realize highly sensitive force sensors and high performance nano-electro-mechanical systems due to their excellent electrical and mechanical properties. However, practical applications require stability of the resonance frequencies against temperature. Here, we demonstrate the manipulation of the thermal expansion coefficients (TECs) by creating a van der Waals heterojunction using graphene and MoS2, which have opposite signs of TECs. Our method greatly suppresses the apparent TEC of the 2D heterojunction to 1/3 of the monolayer graphene without the detraction of the tunability of the resonance frequency by electrostatic attraction.