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Open AccessArticle

Preparation and Characterization of Freely-Suspended Graphene Nanomechanical Membrane Devices with Quantum Dots for Point-of-Care Applications

1
Department of Communications Engineering, University of the Basque Country (UPV/EHU), Plaza Ingeniero Torres Quevedo 1, E-48013 Bilbao, Spain
2
Department of Electrical and Electronics Engineering, Ozyegin University, 34794 Istanbul, Turkey
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 104; https://doi.org/10.3390/mi11010104
Received: 31 December 2019 / Revised: 15 January 2020 / Accepted: 17 January 2020 / Published: 18 January 2020
(This article belongs to the Special Issue Point-of-Care Devices)
We demonstrate freely suspended graphene-based nanomechanical membranes (NMMs) as acoustic sensors in the audible frequency range. Simple and low-cost procedures are used to fabricate NMMs with various thicknesses based on graphene layers grown by graphite exfoliation and solution processed graphene oxide. In addition, NMMs are grafted with quantum dots (QDs) for characterizing mass sensitive vibrational properties. Thickness, roughness, deformation, deflection and emissions of NMMs with attached QDs are experimented and analyzed by utilizing atomic force microscopy, Raman spectroscopy, laser induced deflection analyzer and spectrophotometers. Förster resonance energy transfer (FRET) is experimentally achieved between the QDs attached on NMMs and nearby glass surfaces for illustrating acousto-optic utilization in future experimental implementations combining vibrational properties of NMMs with optical emission properties of QDs. This property denoted as vibrating FRET (VFRET) is previously introduced in theoretical studies while important experimental steps are for the first time achieved in this study for future VFRET implementations. The proposed modeling and experimental methodology are promising for future novel applications such as NMM based biosensing, photonics and VFRET based point-of-care (PoC) devices. View Full-Text
Keywords: graphene oxide; graphene; quantum dot; nanomechanical membrane; acoustic sensing; VFRET; point-of-care graphene oxide; graphene; quantum dot; nanomechanical membrane; acoustic sensing; VFRET; point-of-care
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MDPI and ACS Style

Memisoglu, G.; Gulbahar, B.; Fernandez Bello, R. Preparation and Characterization of Freely-Suspended Graphene Nanomechanical Membrane Devices with Quantum Dots for Point-of-Care Applications. Micromachines 2020, 11, 104.

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