Abstract
Nanostructures with graphene make them highly promising for nanoelectronics, memristor devices, nanosensors and electrodes for energy storage. In some devices the mechanical properties of graphene are important. Therefore, nanoindentation has been used to measure the mechanical properties of polycrystalline graphene in a nanostructure containing metal oxide and graphene. In this study the graphene was transferred, prior to the deposition of the metal oxide overlayers, to the Si/SiO2 substrate were SiO2 thickness was 300 nm. The atomic layer deposition (ALD) process for making a very thin film of Al2O3 (thickness comparable with graphene) was applied to improve the elasticity of graphene. For the alumina film the Al(CH3)3 and H2O were used as the precursors. According to the micro-Raman analysis, after the Al2O3 deposition process, the G-and 2D-bands of graphene slightly broadened but the overall quality did not change (D-band was mostly absent). The chosen process did not decrease the graphene quality and the improvement in elastic modulus is significant. In case the load was 10 mN, the Young’s modulus of Si/SiO2/Graphene nanostructure was 96 GPa and after 5 ALD cycles of Al2O3 on graphene (Si/SiO2/Graphene/Al2O3) it increased up to 125 GPa. Our work highlights the correlation between nanoindentation and defects appearance in graphene.
Highlights
The demand of new devices is increasing, and in several cases, the graphene was used as one component in nanostructures, for example graphene-based biosensors [1]
High-k dielectrics layers on graphene are commonly used for building semiconductor nanodevices, because they are electrically and thermally insulating and can be up for wafer-scale fabrication
Young’s modulus [15–17], but the maximum load has been small and graphene has not been located inside the nanostructure
Summary
The demand of new devices is increasing, and in several cases, the graphene was used as one component (or layer) in nanostructures, for example graphene-based biosensors [1]. The new generation nanodevices are very thin and the mechanical properties of graphene should be taken into consideration. If these devices must be flexible, Young’s modulus of graphene and the materials surrounded should be addressed. There are many methods of depositing dielectrics onto graphene, such as sputtering [9], a pulsed laser deposition [3] and atomic layer deposition (ALD) [7,8,10–12], but there are not many works for learning the mechanical properties of those devices. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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