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Yang HC, Du YS, Lee JJ, Yeh CH, Tseng MC, Ho YC, Kuo HW, Yoshida H, Fujii A, Ozaki M, Tao YT, Akutagawg T, Chen HH. Morphology and Alignment Transition of Hexabenzocoronene (HBC) Mesogen Films by Bar Coating: Effect of Coating Speed. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:16846-16854. [PMID: 39094224 PMCID: PMC11325635 DOI: 10.1021/acs.langmuir.4c01331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
Films of the discotic liquid crystalline hexabenzocoronene (HBC) derivative, HBC-1,3,5-Ph-C12, were prepared on the quartz substrate by the bar-coating method. Depending on the coating speed, regularly spaced stripes or continuous films were observed. In the former case, columns of the HBC derivatives align more along the stripes, which are perpendicular to the coating direction, whereas in the latter case, columns of the HBC derivatives in the film align more along the coating direction. These distinctive structures are confirmed via polarized optical microscopy (POM), polarized UV-vis spectroscopy, and grazing incidence small-angle X-ray scattering measurements.
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Affiliation(s)
- Hao-Chun Yang
- Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
| | - You-Sheng Du
- Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
| | - Jey-Jau Lee
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Chun-Hong Yeh
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Mei-Chun Tseng
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Yi-Chi Ho
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Han-Wen Kuo
- Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
| | - Hiroyuki Yoshida
- School of Engineering Building VII, Kwansei Gakuin University, Sanda 662-8501, Japan
| | - Akihiko Fujii
- Department of Electrical and Electronic Systems Engineering, Osaka Institute of Technology, Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Masanori Ozaki
- Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yu-Tai Tao
- Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
| | - Tomoyuki Akutagawg
- Graduate School of Engineering, Tohoku University, Sendai 980-8577, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Hsiu-Hui Chen
- Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
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Hadjichristov GB, Marinov YG. Photoluminescent Thin Films of Room-Temperature Glassy Tris(keto-hydrozone) Discotic Liquid Crystals and Their Nanocomposites with Single-Walled Carbon Nanotubes for Optoelectronics. ACS OMEGA 2023; 8:27102-27116. [PMID: 37546593 PMCID: PMC10398711 DOI: 10.1021/acsomega.3c02103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 07/06/2023] [Indexed: 08/08/2023]
Abstract
This study addresses the photoresponse of liquid-crystalline tris(keto-hydrozone) discotic (TKHD)-a star-shaped molecular structure with three branches. Object of our research interest was also TKHD filled with single-walled carbon nanotubes (SWCNTs) at a concentration of 1 wt %. At room temperature, the discotic liquid crystals in thin films (thickness 3 μm) of both TKHD and nanocomposite SWCNT/TKHD were in a glassy state. Such glassy thin films exhibited photoluminescence ranging from the deep-red to the near-infrared spectral region, being attractive for organic optoelectronics. The addition of SWCNTs to TKHD was found to stabilize the photoluminescence of TKHD, which is of significance for optoelectronic device applications. The photothermoelectrical response of highly conductive SWCNT/TKHD nanocomposite films was characterized by electrical impedance spectroscopy in the frequency range from 1 Hz to 1 MHz of the applied electric field. It was elucidated that the reversible photothermoelectrical effect in SWCNT/TKHD films occurs through SWCNTs and their network.
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Affiliation(s)
- Georgi B. Hadjichristov
- Laboratory
of Optics & Spectroscopy, Georgi Nadjakov Institute of Solid State
Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., Sofia BG-1784, Bulgaria
| | - Yordan G. Marinov
- Laboratory
of Liquid Crystals & Biomolecular Layers, Georgi Nadjakov Institute
of Solid State Physics, Bulgarian Academy
of Sciences, 72 Tzarigradsko
Chaussee Blvd., Sofia BG-1784, Bulgaria
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Boychuk A, Shibaev V, Cigl M, Hamplová V, Pociecha D, Bubnov A, Bobrovsky A. The role of lateral substituent size in azobenzene chromophores on photo- and chiro-optical properties of photoactive polymethacrylates. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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Nanocomposite system of a discotic liquid crystal doped with thiol capped gold nanoparticles. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Rathod SL, Sharma VS, Sharma AS, Athar M, Shrivastav PS, Parekh HM. “Blue light-emitting Quinoline armed Thiacalix [4]arene 3D-scaffold: a Systematic Platform to construct Fluorescent Liquid Crystals with Bio-imaging Applications”. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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