Bathochromic shift in absorption spectra of conjugated polymer nanoparticles with displacement along backbones

Seo, Dong‐Kyun; Park, Jonghyup; Shin, Tae Joo; Yoo, Pil J.; Park, Juhyun; Kwak, Kyungwon

doi:10.1007/s13233-015-3078-1

Cited by 35 publications

(14 citation statements)

References 15 publications

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“…Such absorbance enhancement of the TIIG-Bz/2-BBA in the NIR region of the spectra was clearly shown even after excluding any scattering effect by measuring the spectra with an integrating sphere. The higher absorbance of the TIIG-Bz wires assembled with 2-BBA in the NIR region was consistent with our recent results of density functional theory calculations for conjugated polymer nanoparticles 54 , 55 . Such a red shift in the absorption spectra originates from enhanced intermolecular π − π interactions with energy level adjustments, and has been widely observed in thin films for organic optoelectronic devices or nanomaterials of conjugated polymers 56 – 61 .…”

Section: Resultssupporting

confidence: 91%

Thienoisoindigo-Based Semiconductor Nanowires Assembled with 2-Bromobenzaldehyde via Both Halogen and Chalcogen Bonding

Noh

Jung

Koo

et al. 2018

Sci Rep

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We fabricated nanowires of a conjugated oligomer and applied them to organic field-effect transistors (OFETs). The supramolecular assemblies of a thienoisoindigo-based small molecular organic semiconductor (TIIG-Bz) were prepared by co-precipitation with 2-bromobenzaldehyde (2-BBA) via a combination of halogen bonding (XB) between the bromide in 2-BBA and electron-donor groups in TIIG-Bz, and chalcogen bonding (CB) between the aldehyde in 2-BBA and sulfur in TIIG-Bz. It was found that 2-BBA could be incorporated into the conjugated planes of TIIG-Bz via XB and CB pairs, thereby increasing the π − π stacking area between the conjugated planes. As a result, the driving force for one-dimensional growth of the supramolecular assemblies via π − π stacking was significantly enhanced. TIIG-Bz/2-BBA nanowires were used to fabricate OFETs, showing significantly enhanced charge transfer mobility compared to OFETs based on pure TIIG-Bz thin films and nanowires, which demonstrates the benefit of nanowire fabrication using 2-BBA.

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Section: Resultssupporting

confidence: 91%

Thienoisoindigo-Based Semiconductor Nanowires Assembled with 2-Bromobenzaldehyde via Both Halogen and Chalcogen Bonding

Noh

Jung

Koo

et al. 2018

Sci Rep

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“…The absorption spectrum of the CPNs (Figure 1d) shows that the absorption maximum of the PCPDTBT assembled in the CPNs is significantly red-shifted to 796 nm in comparison to that of the PCPDTBT dissolved in the chloroform (717 nm). The 79 nm of bathochromic shift in the absorption spectrum was attributed to the intermolecular electronic delocalization between the backbones of the PCPDTBT in the CPNs, as demonstrated in the films and PCPDTBT films and nanoparticles used for the photovoltaic cell and biomedical fields [33,34,35]. This result indicates that the PCPDTBT backbones are closely associated in CPNs, resulting in a prominent enhancement in NIR absorption.…”

Section: Resultsmentioning

confidence: 90%

Machine-Washable Smart Textiles with Photothermal and Antibacterial Activities from Nanocomposite Fibers of Conjugated Polymer Nanoparticles and Polyacrylonitrile

et al. 2018

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Smart textiles based on conjugated polymers have been highlighted as promising fabrics that can intelligently respond to environmental stimuli based on the electrical properties of polymer semiconductors. However, there has been limited interest in the photothermal properties of conjugated polymers that can be applied to smart textiles. We prepared nanoparticles by assembling a conjugated polymer with a fatty acid via an emulsion process and nanocomposite fibers by distributing the conjugated polymer nanoparticles in a polyacrylonitrile matrix. We then fabricated the textiles using the fibers. The resulting fabrics based on nanocomposite fibers show a temperature increase to 50 °C in 10 min under white light irradiation because of efficient photothermal conversion by the conjugated polymer light harvester, while the temperature of a pristine polyacrylonitrile fabric increases to only 35 °C. In addition, excellent antimicrobial activity was confirmed by a 99.9% decrease in the populations of Staphylococcus aureus and Escherichia coli over 24 h because of the effect of the fatty acid in the nanocomposite films and fabrics. Furthermore, the fabric showed efficient durability after a laundry test, suggesting the usefulness of these smart textiles based on conjugated polymer nanoparticles for practical applications.

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“…The bathochromic shift can be a result of the interaction of the aromatic motifs due to their spatial proximity, hydrogen bonding between the benzothiadiazole and the newly generated hydroxyl groups, as well as a polarity change of the surrounding environment upon conjugation. 57–59 The introduction of the azide groups was performed with the crude solution containing the copolymer epoxidized by m CPBA. Similarly, sodium azide was dissolved in DMF and added to the epoxide-containing solution.…”

Section: Resultsmentioning

confidence: 99%

Allyl group-containing polyvinylphosphonates as a flexible platform for the selective introduction of functional groups via polymer-analogous transformations

2021

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Bathochromic shift in absorption spectra of conjugated polymer nanoparticles with displacement along backbones

Cited by 35 publications

References 15 publications

Thienoisoindigo-Based Semiconductor Nanowires Assembled with 2-Bromobenzaldehyde via Both Halogen and Chalcogen Bonding

Thienoisoindigo-Based Semiconductor Nanowires Assembled with 2-Bromobenzaldehyde via Both Halogen and Chalcogen Bonding

Machine-Washable Smart Textiles with Photothermal and Antibacterial Activities from Nanocomposite Fibers of Conjugated Polymer Nanoparticles and Polyacrylonitrile

Allyl group-containing polyvinylphosphonates as a flexible platform for the selective introduction of functional groups via polymer-analogous transformations

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