TY - JOUR
T1 - Highly anisotropic mechanical and optical properties of 2D layered As2S3 membranes
AU - Šiškins, Makars
AU - Lee, Martin
AU - Alijani, Farbod
AU - Van Blankenstein, Mark R.
AU - Davidovikj, Dejan
AU - Van Der Zant, Herre S.J.
AU - Steeneken, Peter G.
PY - 2019
Y1 - 2019
N2 - Two-dimensional (2D) materials with strong in-plane anisotropy are of interest for enabling orientation-dependent, frequency-tunable, optomechanical devices. However, black phosphorus (bP), the 2D material with the largest anisotropy to date, is unstable as it degrades in air. In this work we show that As2S3 is an interesting alternative, with a similar anisotropy to bP, while at the same time having a much higher chemical stability. We probe the mechanical and optical anisotropy in As2S3 by three distinct angular-resolved experimental methods: Raman spectroscopy, atomic force microscopy (AFM), and resonance frequency analysis. Using a dedicated angle-resolved AFM force-deflection method, an in-plane anisotropy factor of EaEc=1.7 is found in the Young's modulus of As2S3 with Ea-axis = 79.1 ± 10.1 GPa and Ec-axis = 47.2 ± 7.9 GPa. The high mechanical anisotropy is also shown to cause up to 65% difference in the resonance frequency, depending on crystal orientation and aspect ratio of membranes.
AB - Two-dimensional (2D) materials with strong in-plane anisotropy are of interest for enabling orientation-dependent, frequency-tunable, optomechanical devices. However, black phosphorus (bP), the 2D material with the largest anisotropy to date, is unstable as it degrades in air. In this work we show that As2S3 is an interesting alternative, with a similar anisotropy to bP, while at the same time having a much higher chemical stability. We probe the mechanical and optical anisotropy in As2S3 by three distinct angular-resolved experimental methods: Raman spectroscopy, atomic force microscopy (AFM), and resonance frequency analysis. Using a dedicated angle-resolved AFM force-deflection method, an in-plane anisotropy factor of EaEc=1.7 is found in the Young's modulus of As2S3 with Ea-axis = 79.1 ± 10.1 GPa and Ec-axis = 47.2 ± 7.9 GPa. The high mechanical anisotropy is also shown to cause up to 65% difference in the resonance frequency, depending on crystal orientation and aspect ratio of membranes.
KW - 2D materials
KW - arsenic trisulfide (AsS)
KW - mechanical anisotropy
KW - multimode resonances
KW - nanoelectromechanical systems (NEMS)
KW - Raman spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85071921151&partnerID=8YFLogxK
U2 - 10.1021/acsnano.9b06161
DO - 10.1021/acsnano.9b06161
M3 - Article
AN - SCOPUS:85071921151
SN - 1936-0851
VL - 13
SP - 10845
EP - 10851
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -