Strain relaxation in monolayer MoS2 over flexible substrate

被引：8

作者：

Basu, Nilanjan ^{[1
,2
]}

Kumar, Ravindra ^{[1
,2
]}

Manikandan, D. ^{[1
,2
,3
]}

Dastidar, Madhura Ghosh ^{[1
,2
,4
,5
,6
]}

Hedge, Praveen ^{[1
,4
,5
,6
]}

Nayak, Pramoda K. ^{[1
,2
,3
,7
]}

Bhallamudi, Vidya Praveen ^{[1
,4
,5
,6
]}

机构：

[1] Indian Inst Technol Madras, Dept Phys, Chennai 600036, India

[2] Indian Inst Technol Madras, 2D Mat Res & Innovat Grp, Chennai 600036, India

[3] Indian Inst Technol Madras, Micro Nano & Biofluid Grp, Chennai 600036, India

[4] Indian Inst Technol Madras, Quantum Ctr Excellence Diamond, Chennai 600036, India

[5] Indian Inst Technol Madras, Dept Phys, Emerging Mat QuCenDiEM Grp, Chennai 600036, India

[6] Indian Inst Technol Madras, Dept Elect Engn, Emerging Mat QuCenDiEM Grp, Chennai 600036, India

[7] Jain Deemed Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, Karnataka, India

来源：

RSC ADVANCES | 2023年 / 13卷 / 24期

关键词：

GRAPHENE; PHOTOLUMINESCENCE; PIEZOELECTRICITY; WS2;

D O I：

10.1039/d3ra01381b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this communication, we demonstrate uniaxial strain relaxation in monolayer (1L) MoS2 transpires through cracks in both single and double-grain flakes. Chemical vapour deposition (CVD) grown 1L MoS2 has been transferred onto polyethylene terephthalate (PET) and poly(dimethylsiloxane) (PDMS) substrates for low (similar to 1%) and high (1-6%) strain measurements. Both Raman and photoluminescence (PL) spectroscopy revealed strain relaxation via cracks in the strain regime of 4-6%. In situ optical micrographs show the formation of large micron-scale cracks along the strain axis and ex situ atomic force microscopy (AFM) images reveal the formation of smaller lateral cracks due to the strain relaxation. Finite element simulation has been employed to estimate the applied strain efficiency as well as to simulate the strain distribution for MoS2 flakes. The present study reveals the uniaxial strain relaxation mechanism in 1L MoS2 and paves the way for exploring strain relaxation in other transition metal dichalcogenides (TMDCs) as well as their heterostructures.

引用

页码：16241 / 16247

页数：7

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