研究目的
Investigating the controlled growth of DAST organic single crystals and modifying their properties for practical applications.
研究成果
The DAST single crystals grown under the control of oleic acid exhibit significantly improved crystallinity, and higher optical properties with wider optical band gap and lower defect density, as compared to those DAST crystals grown without the oleic acid control. This approach is beneficial for the development of nonlinear optics and optoelectronic devices.
研究不足
The study focuses on the effects of OA on DAST crystal growth and properties, but does not explore the incorporation of OA into the crystal structure or its long-term stability.
1：Experimental Design and Method Selection:
DAST single crystals were grown with and without the control of oleic acid by the slow-cooling method under the same conditions.
2：Sample Selection and Data Sources:
All chemicals, used with analytical grade and without purification, were purchased from Cologne chemical Co., Ltd. (Chengdu, China).
3：List of Experimental Equipment and Materials:
Fourier infrared spectroscopy (PE Spectrum 400, PerkinElmer Inco., Waltham, MA, USA), X-ray diffraction (XRD, X’Pert Pro MPD, Malvern Panalytical Ltd., Almelo, The Netherlands), UV-vis spectroscopy (UV-1700, SHIMADZU Co., Kyoto, Japan), and SHG measurements.
4：Experimental Procedures and Operational Workflow:
The growth process involved dissolving DAST powders in methanol with and without OA, cooling the solutions at controlled rates, and observing nucleation and crystal growth.
5：Data Analysis Methods:
The optical absorption coefficient was determined from the transmittance data, and the optical band gaps were estimated by the Tauc plot.
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