Department of Chemistry, Graphene Research Centre, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
Nat Commun. 2013;4:1556. doi: 10.1038/ncomms2579.
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.
钻石的硬度和虚拟不可压缩性使其能够在高压砧细胞中使用。在这里，我们报告了一种通过用石墨烯膜封装单晶钻石来产生静压的新方法，后者因其优异的纳米压痕强度和平面刚性而闻名。加热金刚石-石墨烯界面至金刚石的重构温度（约 1275 K）会产生高密度的石墨烯纳米气泡，这些气泡可以捕获水。在高温下，石墨烯和金刚石之间的化学键足够牢固，使得混合界面能够作为热液砧细胞发挥作用，因为石墨烯是不可渗透的。在加压的石墨烯纳米气泡中捕获的过热水中会蚀刻钻石表面，产生高密度的方形空隙。使用振动光谱探测被困在气泡中的过热水分子的分子结构，并观察到氢键环境的动态变化。
