Graphene nanomesh (GNM) has provided new opportunities to investigate both the fundamental physical properties and the applications in phononic crystal engineering to control thermal transport [1-3]. By using the focused helium ion beam milling (HIM), GNM patterning in less than 4 nm nanopore diameter and a sub-10 nm pitch was achieved [4]. In this work, we successfully fabricated a series of suspended graphene nanomesh devices with CVD graphene by HIM technique (Fig. 1) in high yield. This provided a way to investigate the effect of the porosity to the redirection of the energy carrier propagation with different pitches of the nanopores. Moreover, the transport properties of the symmetric‘fully meshed’ structure (Fig. 2) and the asymmetric‘half meshed’ structure (Fig. 3) were also investigated.
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