Research in a wide range of disciplines – materials science, nano-science, heterogeneous catalysis, corrosion science, polymer science to name but a few – is in strong need of improved surface imaging techniques with structural, chemical, electronic, and magnetic contrasts at spatial resolutions in the nanometer range. Spectroscopic PhotoElectron and Low Energy Electron Microscope (SPELEEM) is unique in that it provides easy access to all of these contrast mechanisms at resolutions in the nanometer range in a single instrument. One of recent and the most important developments concerning this instrument is the upgrade to a microscope with an aberration corrector, which improves the spatial resolution of the microscope by an order of magnitude while increasing the transmission by a similar factor. SPELEEM also has the advantage of having a large dynamic range of view of up to ~100 micrometres thereby facilitating easy access to the structure of not only the nanometer but the micrometer scale as well. Finally, as the detection in SPELEEM is done at video-rates, monitoring of real-time dynamical processes is possible.
|Techniques||LEEM, DF-LEEM, UVPEEM, XPEEM, DF-XPEEM, µ-ARPES, µ-LEED, XMCD, µ-XAS|
|Beam Size||optimum 16x16 µm², minimum 5x5 µm², maximum 50x50 µm²|
|Energy Range||30 - 1200 eV|
|Time Scales||msec - hours|
Golden nanoglue completes the wonder material – X-rays prove it
Modern microelectronics relies on semiconductors and their metal electrodes. High-performance device functionality demands high transistor density within a single chip, which soon will reach the physical limits of bulk materials. Alternatives have been found in atomically thin materials, e.g. graphene and its semiconductive inorganic relatives. MoS2 (molybdenum disulphide) is the representative inorganic layered crystal with