QPlus: atomic force microscopy on single-crystal insulators with small oscillation amplitudes at 5 K
| Autor: | Bernd Uder, Markus Maier, Juergen Koeble, Konrad Winkler, Albrecht Feltz, Andreas Bettac |
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| Rok vydání: | 2009 |
| Předmět: |
Kelvin probe force microscope
Materials science business.industry Mechanical Engineering Analytical chemistry Force spectroscopy Bioengineering General Chemistry Conductive atomic force microscopy law.invention Semiconductor Mechanics of Materials law Optoelectronics General Materials Science Electrical and Electronic Engineering Scanning tunneling microscope business Single crystal Non-contact atomic force microscopy Photoconductive atomic force microscopy |
| Zdroj: | Nanotechnology. 20:264009 |
| ISSN: | 1361-6528 0957-4484 |
| DOI: | 10.1088/0957-4484/20/26/264009 |
| Popis: | Based on a proven low temperature scanning tunneling microscope (STM) platform, we have integrated a QPlus sensor, which employs a quartz tuning fork for force detection in non-contact atomic force microscopy (AFM). For combined STM operation, this sensor has key advantages over conventional sensors. For quantitative force spectroscopy on insulating thin films or semiconductors, decoupling of the tunneling current and the piezo-electrically induced AFM signal is important. In addition, extremely low signals require the first amplification stage to be very close to the sensor, i.e. to be compatible with low temperatures. We present atomic resolution imaging on single-crystal NaCl(100) with oscillation amplitudes below 100 pm (peak-to-peak) and operation at higher flexural modes in constant frequency shift (df) imaging feedback. We also present atomic resolution measurements on MgO(100) and Au(111), and first evaluation measurements of the QPlus sensor in Kelvin probe microscopy on Si(111) 7 x 7. |
| Databáze: | OpenAIRE |
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