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The Effect of Edge Mode on Mass Sensing for Strained Graphene Resonators

by 1,*, 1,2,* and 1,3,*
1
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
2
Key Laboratory of Quantum Sensing Technology (Beihang University), Ministry of Industry and Information Technology, Beijing 100191, China
3
Shenzhen Institute of Beihang University, Shenzhen 518063, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Maozhou Meng
Micromachines 2021, 12(2), 189; https://doi.org/10.3390/mi12020189
Received: 26 January 2021 / Revised: 7 February 2021 / Accepted: 10 February 2021 / Published: 12 February 2021
(This article belongs to the Special Issue Recent Advances in Graphene-based Sensors)
Edge mode could disturb the ultra-subtle mass detection for graphene resonators. Herein, classical molecular dynamics simulations are performed to investigate the effect of edge mode on mass sensing for a doubly clamped strained graphene resonator. Compared with the fundamental mode, the localized vibration of edge mode shows a lower frequency with a constant frequency gap of 32.6 GHz, despite the mutable inner stress ranging from 10 to 50 GPa. Furthermore, the resonant frequency of edge mode is found to be insensitive to centrally located adsorbed mass, while the frequency of the fundamental mode decreases linearly with increasing adsorbates. Thus, a mass determination method using the difference of these two modes is proposed to reduce interferences for robust mass measurement. Moreover, molecular dynamics simulations demonstrate that a stronger prestress or a higher width–length ratio of about 0.8 could increase the low-quality factor induced by edge mode, thus improving the performance in mass sensing for graphene resonators. View Full-Text
Keywords: graphene resonator; edge mode; mass sensing; quality factor; molecular dynamics simulation graphene resonator; edge mode; mass sensing; quality factor; molecular dynamics simulation
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MDPI and ACS Style

Xiao, X.; Fan, S.-C.; Li, C. The Effect of Edge Mode on Mass Sensing for Strained Graphene Resonators. Micromachines 2021, 12, 189. https://doi.org/10.3390/mi12020189

AMA Style

Xiao X, Fan S-C, Li C. The Effect of Edge Mode on Mass Sensing for Strained Graphene Resonators. Micromachines. 2021; 12(2):189. https://doi.org/10.3390/mi12020189

Chicago/Turabian Style

Xiao, Xing, Shang-Chun Fan, and Cheng Li. 2021. "The Effect of Edge Mode on Mass Sensing for Strained Graphene Resonators" Micromachines 12, no. 2: 189. https://doi.org/10.3390/mi12020189

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