▎ 摘　　要

NOVELTY - The system has a first oxide layer (604) placed on a first surface of a substrate (602) and a second oxide layer (606) placed on a second surface of the substrate. A first nitride layer is placed on the first oxide layer. A second nitride layer (616) is placed on the second oxide layer. A channel (648) is defined in the second oxide layer. An inlet port (642) and an outlet port (644) are defined in the second nitride layer in fluid communication with the channel. Viewports are defined in the second nitride layer. A graphene sheet (652) is placed on the second nitride layer. USE - System for fabricating a liquid flow cell for a transmission electron microscopy to provide ultrahigh resolution imaging of samples e.g. nanoparticles and biological samples. ADVANTAGE - The system increases structural integrity and flexibility of graphene for ensuring successful transfer of the graphene onto the second nitride layer, thus enabling better engineering for targeted drug delivery. The system provides graphene membranes with stabilizing effect while imaging biological samples so as to reduce damage to specimens due to electron beam. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for fabricating a liquid flow cell for transmission electron microscopy to provide ultrahigh resolution imaging of samples. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a liquid flow cell including graphene sheets. Substrate (602) Oxide layers (604, 606) Nitride layer (616) Inlet port (642) Outlet port (644) Channel (648) Graphene sheet (652)