题 目 Fabrication and Characterization of Novel Nano-Objects by
Nano-Probe Technologies
时 间 12月26 日上午（星期四）9:30 ~ 10:00 a.m.
地 点 硅材料国家重点实验室1栋2楼会议室
联系人 徐明生 教授
Daisuke Fujita
Director, Advanced Key Technologies Division, National Institute for Materials Science (NIMS), Japan
Abstract
In order to realize sustainable society, creation of novel nano-objects with useful functionalities plays an important role. Innovation of key technologies for the synthesis and characterization shall be expected. Our mission is to develop such key technologies for fabrication, manipulation and characterization of low-dimensional nano-objects using nanoprobe technology. Here the achievements for decades of such nanotechnologies using scanning tunneling microscopy (STM), atomic force microscopy (AFM), and scanning helium ion microscopy (SHIM) are presented.
Interesting nanoscale phenomena like low-dimensional electron interference, point-contact induced nanodots formation, single-electron charging, tunnel-electron induced luminescence, carrier-injection induced phase manipulation, stress-induced domain control, atomic-scale multi-level switching, etc., will be introduced. Especially, taking advantage of atom manipulation with low-temperature UHV-STM, we succeeded in fabrication of a 1-D quantum well (QW) on a single dimer row on Si(001) surface. The energy-resolved dI/dVimaging has shown wave patterns of different amplitudes and periodicities as the sample bias is varied, indicating the formation of 1-D surface state confined in the artificial potential barriers. One-dimensionality on Si(001) has stimulated us to manipulate domain population by controlling surface strain and stress. Recently, we discovered coexistence of carbon nano-objects such as nanodots, nanowires, nanobelts on C-doped metal surfaces using UHV heat treatments. Using this technique, single-layer graphene has been synthesized successfully on various mono-crystalline substrates. With the use of surface co-segregation of doped born and nitrogen atoms, and subsequent surface reaction among them, it has been demonstrated that a few-layer hexagonal BN nanosheet can be synthesized.
In summary, based on the combination of nano-processing capability of advanced nano-probe technologies and applied extreme physical fields such as low-temperature, high-magnetic field, externally applied stress, we can expect further promotion of innovative nanomaterials research based on the nano-architectonics principle.
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