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12 results on '"Onwubiko, Ada"'

1. Charge transport physics of a unique class of rigid-rod conjugated polymers with fused-ring conjugated units linked by double carbon-carbon bonds

Author

Xiao, Mingfei, primary, Carey, Remington L., additional, Chen, Hu, additional, Jiao, Xuechen, additional, Lemaur, Vincent, additional, Schott, Sam, additional, Nikolka, Mark, additional, Jellett, Cameron, additional, Sadhanala, Aditya, additional, Rogers, Sarah, additional, Senanayak, Satyaprasad P., additional, Onwubiko, Ada, additional, Han, Sanyang, additional, Zhang, Zhilong, additional, Abdi-Jalebi, Mojtaba, additional, Zhang, Youcheng, additional, Thomas, Tudor H., additional, Mahmoudi, Najet, additional, Lai, Lianglun, additional, Selezneva, Ekaterina, additional, Ren, Xinglong, additional, Nguyen, Malgorzata, additional, Wang, Qijing, additional, Jacobs, Ian, additional, Yue, Wan, additional, McNeill, Christopher R., additional, Liu, Guoming, additional, Beljonne, David, additional, McCulloch, Iain, additional, and Sirringhaus, Henning, additional

Published
2021
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2. Fused electron deficient semiconducting polymers for air stable electron transport

Author

Onwubiko, Ada, Yue, Wan, Jellett, Cameron, Xiao, Mingfei, Chen, Hung-Yang, Ravva, Mahesh Kumar, Hanifi, David A., Knall, Astrid-Caroline, Purushothaman, Balaji, Nikolka, Mark, Flores, Jean-Charles, Salleo, Alberto, Bredas, Jean-Luc, Sirringhaus, Henning, Hayoz, Pascal, and McCulloch, Iain

Subjects
Science, lcsh:Q, lcsh:Science, Article
Abstract

Conventional semiconducting polymer synthesis typically involves transition metal-mediated coupling reactions that link aromatic units with single bonds along the backbone. Rotation around these bonds contributes to conformational and energetic disorder and therefore potentially limits charge delocalisation, whereas the use of transition metals presents difficulties for sustainability and application in biological environments. Here we show that a simple aldol condensation reaction can prepare polymers where double bonds lock-in a rigid backbone conformation, thus eliminating free rotation along the conjugated backbone. This polymerisation route requires neither organometallic monomers nor transition metal catalysts and offers a reliable design strategy to facilitate delocalisation of frontier molecular orbitals, elimination of energetic disorder arising from rotational torsion and allowing closer interchain electronic coupling. These characteristics are desirable for high charge carrier mobilities. Our polymers with a high electron affinity display long wavelength NIR absorption with air stable electron transport in solution processed organic thin film transistors., Semiconducting polymers are usually prepared by transition metal mediated coupling reactions that cause problems for sustainability and biological applications. Here the authors synthesise fused electron deficient polymers that are air stable and have high electron affinities, via metal free aldol polymerisation reactions.

Published
2018

3. Linking Glass‐Transition Behavior to Photophysical and Charge Transport Properties of High‐Mobility Conjugated Polymers

Author

Xiao, Mingfei, primary, Sadhanala, Aditya, additional, Abdi‐Jalebi, Mojtaba, additional, Thomas, Tudor H., additional, Ren, Xinglong, additional, Zhang, Tao, additional, Chen, Hu, additional, Carey, Remington L., additional, Wang, Qijing, additional, Senanayak, Satyaprasad P., additional, Jellett, Cameron, additional, Onwubiko, Ada, additional, Moser, Maximilian, additional, Liao, Hailiang, additional, Yue, Wan, additional, McCulloch, Iain, additional, Nikolka, Mark, additional, and Sirringhaus, Henning, additional

Published
2020
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4. Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron‐Deficient Polymer Processed by Solution Shear Coating

Author

Xiao, Mingfei, primary, Kang, Boseok, additional, Lee, Seon Baek, additional, Perdigão, Luís M. A., additional, Luci, Alex, additional, Warr, Daniel A., additional, Senanayak, Satyaprasad P., additional, Nikolka, Mark, additional, Statz, Martin, additional, Wu, Yutian, additional, Sadhanala, Aditya, additional, Schott, Sam, additional, Carey, Remington, additional, Wang, Qijing, additional, Lee, Mijung, additional, Kim, Chaewon, additional, Onwubiko, Ada, additional, Jellett, Cameron, additional, Liao, Hailiang, additional, Yue, Wan, additional, Cho, Kilwon, additional, Costantini, Giovanni, additional, McCulloch, Iain, additional, and Sirringhaus, Henning, additional

Published
2020
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5. Linking Glass‐Transition Behavior to Photophysical and Charge Transport Properties of High‐Mobility Conjugated Polymers.

Author

Xiao, Mingfei, Sadhanala, Aditya, Abdi‐Jalebi, Mojtaba, Thomas, Tudor H., Ren, Xinglong, Zhang, Tao, Chen, Hu, Carey, Remington L., Wang, Qijing, Senanayak, Satyaprasad P., Jellett, Cameron, Onwubiko, Ada, Moser, Maximilian, Liao, Hailiang, Yue, Wan, McCulloch, Iain, Nikolka, Mark, and Sirringhaus, Henning

Subjects
ORGANIC field-effect transistors, CONJUGATED polymers, GLASS transition temperature, POLYMERS, LIGHT absorption, AMORPHOUS substances
Abstract

The measurement of the mechanical properties of conjugated polymers can reveal highly relevant information linking optoelectronic properties to underlying microstructures and the knowledge of the glass transition temperature (Tg) is paramount for informing the choice of processing conditions and for interpreting the thermal stability of devices. In this work, we use dynamical mechanical analysis to determine the Tg of a range of state‐of‐the‐art conjugated polymers with different degrees of crystallinity that are widely studied for applications in organic field‐effect transistors. We compare our measured values for Tg to the theoretical value predicted by a recent work based on the concept of effective mobility ζ. The comparison shows that for conjugated polymers with a modest length of the monomer units, the Tg values agree well with theoretically predictions. However, for the near‐amorphous, indacenodithiophene–benzothiadiazole family of polymers with more extended backbone units, values for Tg appear to be significantly higher, predicted by theory. However, values for Tg are correlated with the sub‐bandgap optical absorption suggesting the possible role of the interchain short contacts within materials' amorphous domains. [ABSTRACT FROM AUTHOR]

Published
2021
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9. An Approach to the Core of Lactonamycin

Author

Parsons, Philip J., primary, Jones, Daniel R., additional, Walsh, Lee J., additional, Allen, Lewis A. T., additional, Onwubiko, Ada, additional, Preece, Lewis, additional, Board, Johnathan, additional, and White, Andrew J. P., additional

Published
2017
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11. Synthesis and properties of isoindigo and benzo[1,2-b:4,5-b′]bis[b]benzothiophene oligomers.

Author

Hailiang Liao, Chengyi Xiao, Ravva, Mahesh Kumar, Yazhou Wang, Little, Mark, Jenart, Maud V. C., Onwubiko, Ada, Zhengke Li, Zhaohui Wang, Brédas, Jean-Luc, Mcculloch, Iain, and Wan Yue

Subjects
INDIGO, OLIGOMERIZATION, OLIGOTHIOPHENES, ACENES, ELECTRON-deficient bonds
Abstract

A well-defined series of long and soluble isoindigo thienoacene oligomers have been synthesized from a novel electron deficient building block: benzo[1,2-b:4,5-b′]bis[b]benzothiophene bislactams. Extension of the π-conjugated systems facilitates control of the optical, electronic and device characteristics. [ABSTRACT FROM AUTHOR]

Published
2018
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12. Charge transport physics of a unique class of rigid-rod conjugated polymers with fused-ring conjugated units linked by double carbon-carbon bonds.

Author

Mingfei Xiao, Carey, Remington L., Hu Chen, Xuechen Jiao, Lemaur, Vincent, Schott, Sam, Nikolka, Mark, Jellett, Cameron, Sadhanala, Aditya, Rogers, Sarah, Senanayak, Satyaprasad P., Onwubiko, Ada, Sanyang Han, Zhilong Zhang, Abdi-Jalebi, Mojtaba, Youcheng Zhang, Thomas, Tudor H., Mahmoudi, Najet, Lianglun Lai, and Selezneva, Ekaterina

Subjects
*CONJUGATED polymers, *POLYMERS, *DOUBLE bonds, *CARBON-carbon bonds, *CONDENSED matter physics, *PHYSICS, *NANOSCIENCE, *POLYPHENYLENE vinylene
Published
2021
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