科研之友
微信
新浪微博
Facebook
分享链接
摘要
We measured the far-infrared vibrational properties of bulk and nanoscale MoS2 in order to investigate finite length scale effects and chemical bonding in these materials. From an analysis of frequencies, oscillator strengths, and high-frequency dielectric constants, we extract Born and local effective charges for both materials. In the intralayer direction, we find that the Born effective charge of the nanoparticles is decreased significantly compared to the layered bulk, a difference that we attribute to the structural strain (and resulting change in polarizability) in the nanoparticles.
- 出版日期2009-5
