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Muralidhar JR, Kodama K, Hirose T, Ito Y, Kawamoto M. Noncovalent Functionalization of Single-Walled Carbon Nanotubes with a Photocleavable Polythiophene Derivative. NANOMATERIALS 2021; 12:nano12010052. [PMID: 35010002 PMCID: PMC8746816 DOI: 10.3390/nano12010052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/22/2021] [Accepted: 12/22/2021] [Indexed: 11/25/2022]
Abstract
Single-walled carbon nanotubes (SWCNTs) have received extensive research attention owing to their extraordinary optical, electrical, and mechanical properties, which make them particularly attractive for application in optoelectronic devices. However, SWCNTs are insoluble in almost all solvents. Therefore, developing methods to solubilize SWCNTs is crucial for their use in solution-based processes. In this study, we developed a photocleavable polythiophene-derivative polymer dispersant for SWCNTs. The noncovalent surface functionalization of SWCNTs with a polymer allows their dispersal in tetrahydrofuran. The resultant solution-processed polymer/SWCNT composite film undergoes a hydrophobic-to-hydrophilic change in surface properties upon light irradiation (313 nm) because hydrophilic carboxyl groups are formed upon photocleavage of the hydrophobic solubilizing units in the polymer. Furthermore, the photocleaved composite film displays a 38-fold increase in electrical conductivity. This is due to the removal of the solubilizing unit, which is electrically insulating.
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Affiliation(s)
- Jyorthana Rajappa Muralidhar
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako 351-0198, Japan;
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan; (K.K.); (T.H.)
| | - Koichi Kodama
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan; (K.K.); (T.H.)
| | - Takuji Hirose
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan; (K.K.); (T.H.)
| | - Yoshihiro Ito
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako 351-0198, Japan;
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Japan
- Correspondence: (Y.I.); (M.K.); Tel.: +81-48-467-2752 (Y.I. & M.K.); Fax: +81-48-467-9300 (Y.I. & M.K.)
| | - Masuki Kawamoto
- Emergent Bioengineering Materials Research Team, RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako 351-0198, Japan;
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan; (K.K.); (T.H.)
- Nano Medical Engineering Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako 351-0198, Japan
- Correspondence: (Y.I.); (M.K.); Tel.: +81-48-467-2752 (Y.I. & M.K.); Fax: +81-48-467-9300 (Y.I. & M.K.)
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He P, Shimano S, Salikolimi K, Isoshima T, Kakefuda Y, Mori T, Taguchi Y, Ito Y, Kawamoto M. Noncovalent Modification of Single-Walled Carbon Nanotubes Using Thermally Cleavable Polythiophenes for Solution-Processed Thermoelectric Films. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4211-4218. [PMID: 30516052 DOI: 10.1021/acsami.8b14820] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Four thermally cleavable polythiophene derivatives containing carbonate and solubilizing groups were synthesized for noncovalent modification of single-walled carbon nanotubes (SWCNTs). A well-dispersed polythiophene/SWCNTs composite was obtained by adsorption of the polymer at the SWCNT surface. The solution-processed composite film exhibited solid-state thermal cleavage of the insulating solubilizing group through decarboxylation, producing an insoluble composite film. The thermally cleavable composite film was evaluated for potential application as a thermoelectric (TE) material. The electrical conductivity (σ) of the thermally treated composite film was up to 250 times higher than that of the as-prepared composite film. The increased σ contributed to an increase in the power factor (PF). The ethanol-processed composite film could be applicable for green processing of a TE material using the less-toxic solvent. The substrate-free polythiophene/SWCNTs composite film prepared by simple solvent evaporation yielded a figure-of-merit of 3.1 × 10-2 with a PF of 28.8 μW m-1 K-2 at 25 °C. This solution-processed methodology is beneficial for the development of a flexible TE material.
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Affiliation(s)
- Pan He
- Emergent Bioengineering Materials Research Team , RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
- School of Materials Science and Engineering , Changchun University of Science and Technology , Changchun 130022 , China
| | - Satoshi Shimano
- Strong Correlation Materials Research Group , RIKEN CEMS , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
| | - Krishnachary Salikolimi
- Emergent Bioengineering Materials Research Team , RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
| | - Takashi Isoshima
- Nano Medical Engineering Laboratory , RIKEN Center for Pioneering Research , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
| | - Yohei Kakefuda
- WPI-MANA and Center for Functional Sensor & Actuator , National Institute for Materials Science (NIMS) , 1-1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Takao Mori
- WPI-MANA and Center for Functional Sensor & Actuator , National Institute for Materials Science (NIMS) , 1-1-1 Namiki , Tsukuba 305-0044 , Japan
| | - Yasujiro Taguchi
- Strong Correlation Materials Research Group , RIKEN CEMS , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
| | - Yoshihiro Ito
- Emergent Bioengineering Materials Research Team , RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
- Nano Medical Engineering Laboratory , RIKEN Center for Pioneering Research , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
| | - Masuki Kawamoto
- Emergent Bioengineering Materials Research Team , RIKEN Center for Emergent Matter Science (CEMS) , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
- Nano Medical Engineering Laboratory , RIKEN Center for Pioneering Research , 2-1 Hirosawa , Wako , Saitama 351-0198 , Japan
- Graduate School of Science and Engineering , Saitama University , 255 Shimo-Okubo , Sakura-ku, Saitama 338-8570 , Japan
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Analysis of collision-controlled time dependence of diffusion coefficient of polaron pairs from transient absorption spectra of conducting polymers. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0439-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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