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Anomalous frequency trends in MoS2 thin films attributed to surface effects

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Anomalous frequency trends in MoS2 thin films attributed to surface effects
นักวิจัย : Luo, Xin , Zhao, Yanyuan , Zhang, Jun , Xiong, Qihua , Quek, Su Ying
คำค้น : DRNTU::Science::Physics.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Luo, X., Zhao, Y., Zhang, J., Xiong, Q., & Quek, S. Y. (2013). Anomalous frequency trends in MoS2 thin films attributed to surface effects. Physical review B, 88(7), 075320-. , http://hdl.handle.net/10220/18747 , http://dx.doi.org/10.1103/PhysRevB.88.075320
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The layered dichalcogenide MoS2 has many unique physical properties in low dimensions. Recent experimental Raman spectroscopies report an anomalous blue shift of the in-plane E12g mode with decreasing thickness, a trend that is not understood. Here, we combine experimental Raman scattering and theoretical studies to clarify and explain this trend. Special attention is given to understanding the surface effect on Raman frequencies by using a force constants model based on first-principles calculations. Surface effects refer to the larger Mo-S force constants at the surface of thin film MoS2, which results from a loss of neighbours in adjacent MoS2 layers. Without surface effects, the frequencies of both out-of-plane A1g and in-plane E12g modes decrease with decreasing thickness. However, the E12g mode blue shifts while the A1g mode red shifts once the surface effect is included, in agreement with the experiment. Our results show that competition between the thickness effect and the surface effect determines the mechanical properties of two-dimensional MoS2, which we believe applies to other layered materials.

NRF (Natl Research Foundation, S’pore)

MOE (Min. of Education, S’pore)

บรรณานุกรม :
Luo, Xin , Zhao, Yanyuan , Zhang, Jun , Xiong, Qihua , Quek, Su Ying . (2556). Anomalous frequency trends in MoS2 thin films attributed to surface effects.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Luo, Xin , Zhao, Yanyuan , Zhang, Jun , Xiong, Qihua , Quek, Su Ying . 2556. "Anomalous frequency trends in MoS2 thin films attributed to surface effects".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Luo, Xin , Zhao, Yanyuan , Zhang, Jun , Xiong, Qihua , Quek, Su Ying . "Anomalous frequency trends in MoS2 thin films attributed to surface effects."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Luo, Xin , Zhao, Yanyuan , Zhang, Jun , Xiong, Qihua , Quek, Su Ying . Anomalous frequency trends in MoS2 thin films attributed to surface effects. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.