Effects of γ-ray radiation on two-dimensional molybdenum disulfide (MoS2) nanomechanical resonators
Abstract
We report on experimental investigation and analysis of γ-ray radiation effects on two-dimensional molybdenum disulfide (MoS2) drumhead nanomechanical resonators vibrating at megahertz frequencies. Given calibrated dosages of γ-ray radiation of ∼5000 photons with energy at 662 keV, upon exposure over 24 or 12 h, all the MoS2 resonators exhibit ∼0.5–2.1% resonance frequency upshifts due to the ionizing γ-ray induced charges and their interactions. The devices show γ-ray photon responsivity of ∼30–82 Hz/photon, with an intrinsic γ-ray sensitivity (limit of detection) estimated to approach ∼0.02–0.05 photon. After exposure expires, resonance frequencies return to an ordinary tendency where the frequency variations are dominated by long-term drift. These γ-ray radiation induced frequency shifts are distinctive from those due to pressure variation or surface adsorption mechanisms. The measurements and analyses show that MoS2 resonators are robust yet sensitive to very low dosage γ-ray, demonstrating a potential for ultrasensitive detection and early alarm of radiation in the very low dosage regime.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 11, 2016
- Source ID
- 10.1063/1.4939685
Entities
People
- Jaesung Lee
- Matthew Krupcale
- Philip X-L Feng
Organizations
- Case Western Reserve University
- Defense Threat Reduction Agency
- National Science Foundation