题目：

Enhanced piezoelectric effect at the edges of stepped molybdenum disulfide nanosheets

作者：

Xiaoxue Song ¹ , Fei Hui ¹ , Keith Gilmore ² , Bingru Wang ¹ , Guangyin Jing ³ , Zhongchao Fan ⁴ ,Enric Grustan-Gutierrez ¹ , Yuanyuan Shi ¹ , Lucia Lombardi⁵,Stephen A. Hodge ⁵ , Andrea C.Ferrari⁵,Mario Lanza ^1,*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nanoscience and Technology, Soochow University, 199 Ren-AiRoad, Suzhou 215123, China.

²European Synchrotron Radiation Facility, BP 220, 38047 Grenoble, Cedex,France.

³State Key Lab Incubation Base of Photoelectric Technology and FunctionalMaterials, School of Physics, Northwest University, 229 Taibai Beilu, Xi’An, 710069, China.

³Department of Materials Science and Engineering, Stanford University, CA , 94305 , USA.

⁴Engineering Research Center for Semiconductor Integrated Technology, Institute ofSemiconductors, Chinese Academy of Sciences, Beijing 100083, China.

⁵CambridgeGraphene Centre, University of Cambridge, 9 JJ Thomson Ave, Cambridge, CB3 0FA, UK.

摘要：

The development of piezoelectric layered materials may be one of the key elements enabling expansion of nanotechnology, as they represent a realistic solution for the construction of efficient transducers for a wide range of applications, including self-powered devices. Here, we investigate the piezoelectric effect in multilayer stepped MoS₂ flakes obtained by liquid-phase exfoliation, which is especially interesting because it may allow the fabrication of scalable electronic devices using large area deposition techniques (e.g. solution casting, spray coating, inkjet printing). By using a conductive atomic force microscope we map the piezoelectricity of the MoS₂ flakes at the nanoscale. Our experiments demonstrate the presence of electrical current densities above 100 A/cm ² when the flakes are strained in the absence of bias, and the current increases proportional to the bias. Simultaneously collected topographic and current maps demonstrate that the edges of stepped multilayer MoS₂ flakes promote the piezoelectric effect, as the largest currents are seen there. Density functional theory calculations are consistent with the ring-like piezoelectric potential generated when the flakes are strained, as well as the enhanced piezoelectric effect at edges. Our results pave the way to the design of piezoelectric devices using layered materials.

影响因子：

7.760

分区情况：

一区

链接：

http://pubs.rsc.org/en/content/articlepdf/2017/nr/c6nr09275f

责任编辑：向丹婷 联系方式：dtxiang@suda.edu.cn