Villarreal Renan, Lin Pin-Cheng, Faraji Fahim, Hassani Nasim, Bana Harsh, Zarkua Zviadi, Nair Maya N, Tsai Hung-Chieh, Auge Manuel, Junge Felix, Hofsaess Hans C, De Gendt Stefan, De Feyter Steven, Brems Steven, Åhlgren E Harriet, Neyts Erik C, Covaci Lucian, Peeters François M, Neek-Amal Mehdi, Pereira Lino M C
Quantum Solid State Physics, KU Leuven, 3001 Leuven, Belgium.
Research group PLASMANT, Department of Chemistry, Universiteit Antwerpen (UIA), 2610 Antwerpen, Belgium.
Nano Lett. 2021 Oct 13;21(19):8103-8110. doi: 10.1021/acs.nanolett.1c02470. Epub 2021 Sep 14.
We report the formation of nanobubbles on graphene with a radius of the order of 1 nm, using ultralow energy implantation of noble gas ions (He, Ne, Ar) into graphene grown on a Pt(111) surface. We show that the universal scaling of the aspect ratio, which has previously been established for larger bubbles, breaks down when the bubble radius approaches 1 nm, resulting in much larger aspect ratios. Moreover, we observe that the bubble stability and aspect ratio depend on the substrate onto which the graphene is grown (bubbles are stable for Pt but not for Cu) and trapped element. We interpret these dependencies in terms of the atomic compressibility of the noble gas as well as of the adhesion energies between graphene, the substrate, and trapped atoms.
我们报道了通过将惰性气体离子（He、Ne、Ar）以超低能量注入生长在Pt(111)表面的石墨烯中，在石墨烯上形成半径约为1 nm的纳米气泡。我们表明，先前已针对较大气泡确定的纵横比的通用标度关系，在气泡半径接近1 nm时失效，导致纵横比大得多。此外，我们观察到气泡稳定性和纵横比取决于石墨烯生长的衬底（气泡在Pt上稳定，但在Cu上不稳定）以及捕获的元素。我们根据惰性气体的原子压缩性以及石墨烯、衬底和捕获原子之间的粘附能来解释这些依赖性。
