Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface
Abstract
:1. Introduction
2. Materials and Methods
- (1)
- Specimens were degassed in the preparation chamber at about 450 °C. Then, the sample was repeatedly flashed at 1250 °C until a clean well-ordered Si(111)-7 × 7 reconstructed surface was obtained. Afterwards, the sample was cooled down to room temperature in the preparation chamber.
- (2)
- Three Si(111)-7 × 7 samples were successively sent into the observation chamber, which was filled with CH3OH gas. At the same time, the mass spectrometer was turned on to monitor the gaseous ion composition in the observation chamber. Si(111)-7 × 7-CH3OH samples were heated in 0.2 A current with an external power source. Under the detection of an infrared radiation thermometer, the temperature of samples with heating time in 2, 3 and 4 s, were about 37, 55 and 76 °C, respectively.
- (3)
- After the data of the mass spectrometer was collected, Si(111)-7 × 7-CH3OH samples were moved to the preparation chamber. In the STM system, metal atoms can be deposited by controlling the evaporation time and pressure. Through the evaporation device, Fe atoms were evaporated by heating a W filament with iron wire (purity > 99.995%). Different wire dimensions correspond to different rated operating temperatures. Aimed to improve the evaporation temperature in references (about 1000 °C) [20,21,22], a thinner Fe wire was selected to realize a higher temperature (about 1300 °C) and reduce the influence on the linear structure.
3. Results and Discussions
3.1. Process and Adsorption Sites of CH3OH
3.2. Explore the Formation Process and Models of Fe Cluster
3.3. Explore the Model and Stability of Linear Structure
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
STM | Scanning tunneling microscopy |
XPS | X-ray photoelectron spectroscopy |
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Li, W.; Ding, W.; Ju, D.; Tanaka, K.-i.; Komori, F. Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface. Materials 2018, 11, 1593. https://doi.org/10.3390/ma11091593
Li W, Ding W, Ju D, Tanaka K-i, Komori F. Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface. Materials. 2018; 11(9):1593. https://doi.org/10.3390/ma11091593
Chicago/Turabian StyleLi, Wenxin, Wanyu Ding, Dongying Ju, Ken-ichi Tanaka, and Fumio Komori. 2018. "Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface" Materials 11, no. 9: 1593. https://doi.org/10.3390/ma11091593