title: A hydrothermal anvil made of graphene nanobubbles on diamond.
abstract: The hardness and virtual incompressibility of diamond allow it to be used in high-pressure anvil cell. Here we report a new way to generate static pressure by encapsulating single-crystal diamond with graphene membrane, the latter is well known for its superior nano-indentation strength and in-plane rigidity. Heating the diamond-graphene interface to the reconstruction temperature of diamond (~1,275 K) produces a high density of graphene nanobubbles that can trap water. At high temperature, chemical bonding between graphene and diamond is robust enough to allow the hybrid interface to act as a hydrothermal anvil cell due to the impermeability of graphene. Superheated water trapped within the pressurized graphene nanobubbles is observed to etch the diamond surface to produce a high density of square-shaped voids. The molecular structure of superheated water trapped in the bubble is probed using vibrational spectroscopy and dynamic changes in the hydrogen-bonding environment are observed.
authors: Department of Chemistry, Graphene Research Centre, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
authors: Candy Haley Yi Xuan
authors: CH
authors: Lim
authors: Anastassia
authors: A
authors: Sorkin
authors: Qiaoliang
authors: Q
authors: Bao
authors: Ang
authors: A
authors: Li
authors: Kai
authors: K
authors: Zhang
authors: Milos
authors: M
authors: Nesladek
authors: Kian Ping
authors: KP
authors: Loh