Betti Maria Grazia, Blundo Elena, De Luca Marta, Felici Marco, Frisenda Riccardo, Ito Yoshikazu, Jeong Samuel, Marchiani Dario, Mariani Carlo, Polimeni Antonio, Sbroscia Marco, Trequattrini Francesco, Trotta Rinaldo
INFN Sezione di Roma 1, Sapienza Università di Roma, P.le Aldo Moro 2, 00185 Rome, Italy.
Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 2, 00185 Rome, Italy.
Nanomaterials (Basel). 2022 Jul 29;12(15):2613. doi: 10.3390/nano12152613.
Atomic deuterium (D) adsorption on free-standing nanoporous graphene obtained by ultra-high vacuum D2 molecular cracking reveals a homogeneous distribution all over the nanoporous graphene sample, as deduced by ultra-high vacuum Raman spectroscopy combined with core-level photoemission spectroscopy. Raman microscopy unveils the presence of bonding distortion, from the signal associated to the planar sp2 configuration of graphene toward the sp3 tetrahedral structure of graphane. The establishment of D-C sp3 hybrid bonds is also clearly determined by high-resolution X-ray photoelectron spectroscopy and spatially correlated to the Auger spectroscopy signal. This work shows that the low-energy molecular cracking of D2 in an ultra-high vacuum is an efficient strategy for obtaining high-quality semiconducting graphane with homogeneous uptake of deuterium atoms, as confirmed by this combined optical and electronic spectro-microscopy study wholly carried out in ultra-high vacuum conditions.
通过超高真空下D2分子裂解获得的独立式纳米多孔石墨烯上的原子氘（D）吸附，通过超高真空拉曼光谱结合芯能级光电子能谱推断，在整个纳米多孔石墨烯样品上呈现均匀分布。拉曼显微镜揭示了键合畸变的存在，从与石墨烯平面sp2构型相关的信号向石墨烷的sp3四面体结构转变。D-C sp3杂化键的形成也通过高分辨率X射线光电子能谱明确确定，并与俄歇能谱信号在空间上相关。这项工作表明，在超高真空下D2的低能分子裂解是一种获得高质量半导体石墨烷且氘原子均匀吸收的有效策略，这一结论由在超高真空条件下完全进行的这项光学和电子光谱显微镜联合研究得到证实。
