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Proposal of Organic Single Crystal Growth Method Using Electrospray Deposition and Thin‐Film Ionic Liquid
Author(s) -
Ueda Hiroyuki,
Takeuchi Keita,
Terada Ryo,
Kikuchi Akihiko
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201700351
Subject(s) - materials science , crystal (programming language) , deposition (geology) , analytical chemistry (journal) , ionic bonding , liquid crystal , crystal growth , single crystal , thin film , nitrogen , crystallography , chemical engineering , nanotechnology , chemistry , ion , chromatography , optoelectronics , organic chemistry , paleontology , sediment , computer science , engineering , biology , programming language
A novel crystal growth technique is proposed that uses a thin ionic liquid film with an extremely low vapor pressure as the crystal growth field, and a solute supplied by electrospray deposition through the surface of the liquid film. The precipitation properties of small molecule Alq 3 single crystals were investigated at 25 °C under atmospheric pressure in a nitrogen atmosphere. Using the proposed method, aggregated small crystals of less than 10 μm, rhombic plate‐like crystals with diagonal lengths of 50 μm, and hexagonal plate‐like crystals of 100 μm were precipitated when the solution supply rates (supply times) were 8.0 (90), 4.0 (180), and 2.0 μl min −1 (360 min), respectively. Alq 3 is known to be a material difficult to grow into plate‐like crystals, however, when solution was supplied to the ionic liquid at a rate of 2.0 μl min −1 for 16 h, large hexagonal plate‐like crystals with a diagonal length of about 400 μm are obtained, which are among the largest plate‐like Alq 3 ‐based crystals ever reported. The proposed crystal growth technique is expected to be beneficial for growing large size plate‐like single crystals of various organic materials.