Bae Ho Park

Beeby S.

Dong Hoon Shin

Eleanor E. B. Campbell

Hakseong Kim

Il-Suk Kang

Kirstie McAllister

Miri Seo

Ohring M.

Sang Wook Lee

Sangik Lee

Crossref

ACS Applied Materials & Interfaces

Accurate and Precise Determination of Mechanical Properties of Silicon Nitride Beam Nanoelectromechanical Devices

Accurate and precise determination of mechanical properties of nanoscale materials is mandatory since device performances of nanoelectromechanical systems (NEMS) are closely related to the flexural properties of the materials. In this study, the intrinsic mechanical properties of highly stressed silicon nitride (SiN) beams of varying lengths are investigated using two different techniques: Dynamic flexural measurement using optical interferometry and quasi-static flexural measurement using atomic force microscopy. The resonance frequencies of the doubly clamped, highly stressed beams are found to be inversely proportional to their length, which is not usually observed from a beam but is expected from a string-like structure. The mass density of the SiN beams can be precisely determined from the dynamic flexural measurements by using the values for internal stress and Young’s modulus determined from the quasi-static measurements. As a result, the mass resolution of the SiN beam resonators was predicted to be a few attograms, which was found to be in excellent agreement with the experimental results. This work suggests that accurate and precise determination of mechanical properties can be achieved through combined flexural measurement techniques, which is a crucial key for designing practical NEMS applications such as biomolecular sensors and gas detectors

Kim, Hakseong

Shin, Dong Hoon

Mcallister, Kirstie

Seo, Miri

Lee, Sangik

Kang, Il-suk

Park, Bae Ho

Campbell, Eleanor E. B.

Lee, Sang Wook

Edinburgh Research Explorer

https://www.pure.ed.ac.uk/ws/files/31321223/20170220_Campbell_E_ACSAMI_SiN_NEM_final.pdf

Accurate and Precise Determination of Mechanical Properties of Silicon Nitride Beam Nanoelectromechanical Devices

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