Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster Ib
HL 36.14: Poster
Dienstag, 8. März 2016, 15:00–19:00, Poster A
Synthesis and characterization of free standing Silicene modified with organic groups — •Ravi Kumar Divakar1, Wladmir Thiessen1, Ihsan Amin2, Raul David Rodriguez3, Manuel Monecke3, Mahfujur Rahaman3, and Lukas M. Eng1 — 1Institut für Angewandte Physik, TU Dresden, Dresden, Germany — 2Institut für Makromolekulare Chemie, TU Dresden, Dresden, Germany — 3Institut für Physik, TU Chemnitz, Chemnitz, Germany
Silicene has attracted remarkable attention in both research and industry due to its potential application for devices such as field effect transistors [1]. Silicene usually is synthesized on Ag substrate using ultra high vacuum system [2]. We present here a novel wet-chemical synthesis route in order to prepare free-standing Silicene monolayers which are modified with organic moieties at the highly reactive Si-atoms at the edges of the sheet. These organic moieties prevent oxidation and provide stability in aqueous surfactant solution. The monolayer with surfactant has a thickness of ~2.5 nm measured by AFM [3]. Furthermore we have performed TEM measurements, showing a honeycomb lattice with the lattice constant a = (2.18 * 0.11) Å, in accordance with DFT calculations [4]. SEM measurements show a stacked morphology of Silicene sheets. The presence of silicon in the synthesized material is confirmed by XPS. In summary, we demonstrate a novel way to synthesize free standing Silicene. [1] Li Tao et al., Nature Nanotechnology 10 (2015) 227. [2] P. Vogt et al., Appl. Phys. Lett. 104 (2014) 021602. [3] M. Ait Ali et al., J. Physics: Conf. Series 491 (2014) 012009. [4] L. Chen et al., Appl. Phys. Lett. 102 (2013) 081602.