Enhanced Piezoelectric Effect Derived from Grain Boundary in MoS2 Monolayers

Mingjin Dai, Wei Zheng, Xi Zhang, Sanmei Wang, Junhao Lin, Kai Li, Yunxia Hu, Enwei Sun, Jia Zhang, Yunfeng Qiu, Yongqing Fu, Wenwu Cao, PingAn Hu

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)
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Recent discovery of piezoelectricity that existed in two-dimensional (2D) layered materials represents a key milestone for flexible electronics and miniaturized and wearable devices. However, so far the reported piezoelectricity in these 2D layered materials is too weak to be used for any practical applications. In this work, we discovered that grain boundaries (GBs) in monolayer MoS 2 can significantly enhance its piezoelectric property. The output power of piezoelectric devices made of the butterfly-shaped monolayer MoS 2 was improved about 50% by the GB-induced piezoelectric effect. The enhanced piezoelectricity is attributed to the additional piezoelectric effect induced by the existence of deformable GBs which can promote polarization and generates spontaneous polarization with different piezoelectric coefficients along various directions. We further made a flexible piezoelectric device based on the 2D MoS 2 with the GBs and demonstrated its potential application in self-powered precision sensors for in situ detecting pressure changes in human blood for health monitoring.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalNano Letters
Issue number1
Early online date19 Dec 2019
Publication statusPublished - 8 Jan 2020


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