Atomically thin 2-dimensional (2D) mechanical resonators are expected to be highly sensitive force sensor and high performance nano-electro-mechanical systems because of their excellent electrical and mechanical properties. For practical application, the stability of their resonance frequencies against the temperature is very crucial. Here, we demonstrate the manipulation of thermal expansion coefficients (TECs) by making van der Waals heterojunction, graphene and MoS2, which have opposite signs of TECs. The apparent TEC of the 2D heterojunction is greatly suppressed to 1/3 of monolayer graphene without the limitation of tunability of the resonance frequency by application of electrostatic attraction.

翻译：原子薄二维(2D)机械共振器,由于其极好的电气和机械特性,预计将是高度敏感力传感器和高性能纳米电子机械系统。为了实际应用,其共振频率对温度的稳定性非常关键。在这里,我们展示了对热扩张系数(TECs)的操纵,它制造了Van der Waals 血清结合、石墨和MOS2,它们具有技术ECs的反象。2D血清结合的明显技术EC被大大抑制为1/3的单层石墨内,而没有通过静电吸引限制共振频率的金枪鱼性。