题目：

Utilizing 9,10-Dihydroacridine and Pyrazine-Containing Donor�Acceptor Host Materials for Highly Efficient Red Phosphorescent Organic Light-Emitting Diodes

作者：

Xiang-Yang Liu, Feng Liang, Yi Yuan, Zuo-Quan Jiang* andLiang-Sheng Liao*

单位：

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China.

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：

5.066

分区情况：

一区

链接：

http://pubs.rsc.org/en/content/articlelanding/2016/tc/c6tc02180h