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Kazim S, Alì M, Palleschi S, D'Olimpio G, Mastrippolito D, Politano A, Gunnella R, Di Cicco A, Renzelli M, Moccia G, Cacioppo OA, Alfonsetti R, Strychalska-Nowak J, Klimczuk T, J Cava R, Ottaviano L. Mechanical exfoliation and layer number identification of single crystal monoclinic CrCl 3. Nanotechnology 2020; 31:395706. [PMID: 32150734 DOI: 10.1088/1361-6528/ab7de6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
After the recent finding that CrI3, displays ferromagnetic order down to its monolayer, extensive studies have followed to pursue new two-dimensional (2D) magnetic materials. In this article, we report on the growth of single crystal CrCl3 in the layered monoclinic phase. The system after mechanical exfoliation exhibits stability in ambient air (the degradation occurs on a time scale at least four orders of magnitude longer than is observed for CrI3). By means of mechanical cleavage and atomic force microscopy (AFM) combined with optical identification, we demonstrate the systematic isolation of single and few layer flakes onto 270 nm and 285 nm SiO2/Si (100) substrates with lateral size larger than graphene flakes isolated with the same method. The layer number identification has been carried with statistically significant data, quantifying the optical contrast as a function of the number of layers for up to six layers. Layer dependent optical contrast data have been fitted within the Fresnel equation formalism determining the real and imaginary part of the wavelength dependent refractive index of the material. A layer dependent (532 nm) micro-Raman study has been carried out down to two layers with no detectable spectral shifts as a function of the layer number and with respect to the bulk.
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Affiliation(s)
- S Kazim
- School of Science and Technology Physics division, Università di Camerino, Italy
| | - M Alì
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
| | - S Palleschi
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
- Lfoundry, Avezzano (AQ), Italy
| | - G D'Olimpio
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
| | - D Mastrippolito
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
| | - A Politano
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
| | - R Gunnella
- School of Science and Technology Physics division, Università di Camerino, Italy
| | - A Di Cicco
- School of Science and Technology Physics division, Università di Camerino, Italy
| | | | | | | | | | - J Strychalska-Nowak
- Faculty of Applied Physics and Mathematics Gdansk University of Technology, Gdansk, Poland
| | - T Klimczuk
- Faculty of Applied Physics and Mathematics Gdansk University of Technology, Gdansk, Poland
| | - R J Cava
- Department of Chemistry Princeton University, Princeton, NJ 08544, United States of America
| | - L Ottaviano
- Department of Physical and Chemical Sciences (DSFC) Università dell'Aquila, L'Aquila, Italy
- CNR-SPIN uos L'Aquila, L'Aquila Italy
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Miruszewski T, Winiarz P, Dzierzgowski K, Wiciak K, Zagórski K, Morawski A, Mielewczyk-Gryń A, Wachowski S, Strychalska-Nowak J, Sawczak M, Gazda M. Synthesis, microstructure and electrical properties of nanocrystalline calcium doped lanthanum orthoniobate. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2018.12.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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