Defect-Induced Vibration Modes of Ar+-Irradiated MoS2

被引：72

作者：

Bae, Soungmin ^{[1
]}

Sugiyama, Natsuki ^{[1
]}

Matsuo, Takatoshi ^{[1
]}

Raebiger, Hannes ^{[1
]}

Shudo, Ken-ichi ^{[1
,2
]}

Ohno, Koichi ^{[3
,4
]}

机构：

[1] Yokohama Natl Univ, Dept Phys, Hodogaya Ku, Yokohama, Kanagawa 2408501, Japan

[2] Inst Phys & Chem Res RIKEN, Ctr Sustainable Resource Sci & Elements Chem Lab, Wako, Saitama 3510198, Japan

[3] IQCE, Minato Ku, Tokyo 1080022, Japan

[4] Tohoku Univ, Grad Sch Sci, Dept Chem, Aoba Ku, Sendai, Miyagi 9808578, Japan

来源：

PHYSICAL REVIEW APPLIED | 2017年 / 7卷 / 02期

关键词：

RAMAN-SPECTROSCOPY; LAYER MOS2; GRAPHENE; PHONON; EXFOLIATION; MULTILAYER; MONOLAYER;

D O I：

10.1103/PhysRevApplied.7.024001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Ar+-irradiated molybdenum-disulfide (MoS2) surface is studied by means of Raman spectroscopy and first-principles calculation. This experimental study reveals that Ar+ irradiation gives rise to satellite peaks at the lower-frequency side of the Raman-active E-2g(1) and A(1g) modes of MoS2 and a new peak at approximately 450 cm(-1). We calculate the phonon modes and Raman spectra of defective MoS2 systems from first principles, and show that Mo and S vacancies give rise to such satellite peaks. These satellite peaks are a modulation of the E-2g(1) and A(1g) modes, described in terms of localization and scattering of vibration modes. The new peak at 450 cm(-1), however, is a unique signature of the S vacancy. At low irradiation doses, the S vacancy is the dominant defect, whereas for large irradiation doses, the satellite peaks overshadow the MoS2 peaks, which we show to be typical for the Mo vacancy and MoS6 vacancy cluster. We thus show that Raman spectroscopy can be used not only to observe defects in two-dimensional materials, but also to identify the type of the defects.

引用

页数：7

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[1] Honeycomb Carbon: A Review of Graphene [J].