Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Organic semiconductors II

CPP 31.8: Talk

Thursday, March 29, 2012, 11:45–12:00, C 130

Crystal Growth of Organic Compound From The Melt — •Huamin Irvine Hong and Christian Kloc — School of Materials Science and Engineering Nanyang Technological University Block N4.1 Nanyang Avenue Singapore 639798

In this study, single crystals of anthracene up to few centimeters were developed from the melt based on a self designed, inexpensive and versatile zone refining apparatus. Platelets cut from these crystals by applying thread saw were tested for purity and perfection by Powder X-ray Diffraction (XRD), Laser Desorption Ionization-Time of Flight Mass Spectrometry (LDI-ToF MS), Fourier-Transform Infrared Spectroscopy (FT-IR), Atomic Force Microscopy (AFM) & fluorescence measurement. Based on the purity analysis, impurities within commercial anthracene powder such as Carbazole and 9, 9*Bianthryl (dimers) have been reduced significantly as indicated by LDI-ToF MS analysis.

In addition, single crystals of Stilbene up to few centimeters (ideal scintillation properties) has been developed applying the same technique. The Stilbene crystal does not show any formation of intrinsic impurities such as dimers as compared to those of anthracene crystal upon zone refinement. Hence, the results indicate that zone refinement can produce high quality organic crystals with desired properties provided that intrinsic impurities (dimers etc) do not form upon the thermal fusion.