Graphene is valuable nanomaterial due to its outstanding electronic and physical properties. Generating regular defects in graphene to produce holey graphene has been a strategy to modulate graphene electronic properties. The primary issue for this process is the sub 5 nm patterning required. A novel strategy to achieve such fine patterning is the use of covalent organic frameworks (COFs) to define the pattern to be etched. After patterning, the holes can be used as chemical handles for synthesizing functional composite materials. Here, we demonstrate composite materials with gold and palladium nanoparticles filling in the COF templated holes without additional reducing agent. Strong coupling between the nanoparticles and holey graphene is confirmed by XPS and FET characteristics. Raman enhancement of the underlying holey graphene signal was observed and consistent with a SERS effect. Composites were also utilized to achieve chemiresistive gas sensing with calculated detection limits of 3 ppb for gold/hydrogen sulfide and 10 ppm for palladium/hydrogen.

Holey graphene noble metal nanoparticle composites via crystalline polymer templated etching

2019 Fall National Meeting

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