Toward Thermally, Oxidatively, and Spectrally Stable Polyfluorene-Based Materials: Aromatic Ether-Functionalized Polyfluorene

McFarlane, Shaune L.; Piercey, Davin G.; Coumont, Leah S.; Tucker, Ryan T.; Fleischauer, Michael D.; Brett, Michael; Veinot, Jonathan G. C.

doi:10.1021/ma8022348

Cited by 15 publications

(8 citation statements)

References 45 publications

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“…The advantage of Yamamoto coupling is that only a single, halogen‐functionalized monomer is required. The monomer species diversity and simple reaction procedure mean that it is an interesting reaction for the design of novel networks …”

Section: Preparation Routes To Cmpsmentioning

confidence: 99%

Design, preparation and application of conjugated microporous polymers

et al. 2013

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Conjugated microporous polymers (CMPs) are of great interest because these types of materials have high specific surface area and pore diameters less than 2 nm. CMPs have found applications in the fields of hydrogen storage, heterogeneous catalysts, gas-permeable membranes and light-emitting organics. A large number of recent reports have demonstrated that CMPs can be prepared using several approaches like noble metal-mediated ethynyl, Sonogashira-Hagihara coupling, Suzuki coupling and Yamamoto coupling reactions. In this review, the synthetic routes, functionalization and potential applications of CMPs are systematically introduced.

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Section: Preparation Routes To Cmpsmentioning

confidence: 99%

Design, preparation and application of conjugated microporous polymers

et al. 2013

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“…However, this technique also causes large nanotube bundles that negatively impact the SWCNT functionality as well as weaken the material’s intrinsic photoluminescence (PL) efficiency. , Moreover, it has been found that surfactant layers tightly clinging to SWCNT sidewalls cannot be completely removed by simply rinsing. ,, Although harsher methods, such as acidic treatment (e.g., nitric acid), can efficiently etch obstinate residues, , the strong oxidative nature of such treatments can also induce covalent defects in nanotube sidewalls . Alternatively, annealing has been routinely used to increase the conductivity of devices fabricated from SWCNTs that are solution-processed using surfactants and polymers. ,,, However, residues often remain after annealing, which limit the efficacy of this approach. ,,− …”

Section: Introductionmentioning

confidence: 79%

Cleanly Removable Surfactant for Carbon Nanotubes

et al. 2021

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Surfactants, molecular surface-active agents, are widely used to stabilize single-walled carbon nanotubes (SWCNTs) and many other nanomaterials in water to facilitate solution processing and device integration. However, it is notoriously difficult to cleanly remove surfactants when they are no longer needed. Even high-temperature thermal annealing leaves residues that can degrade the otherwise remarkable electrical and optical properties of SWCNTs. Moreover, thermal annealing damages smaller-diameter nanotubes (<1 nm) due to aggressive oxidation at elevated temperatures. To address this challenge, we report the synthesis of ammonium deoxycholate (ADC) that can be cleanly removed at a relatively low temperature that preserves the SWCNT structure. We find that ADC is as efficient as sodium deoxycholate (a commonly used surfactant featuring the same anion) at individually dispersing SWCNTs in water. However, replacing the metal cation (Na+) of sodium deoxycholate with ammonium (NH4 +) to form ADC reduces the peak thermal decomposition temperature by nearly 70 °C. Furthermore, unlike sodium deoxycholate, thermal annealing of ADC in Ar leaves behind only a small amount of carbonized residue that can be cleanly decomposed in the presence of 5% O2 at 400 °C, a condition that preserves SWCNTs even with a small diameter of just 0.76 nm. This work uncovers the chemical origin of residues from the thermal annealing of surfactant-processed carbon nanomaterials and provides an unexpectedly simple solution to this persistent challenge.

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“…Keto-defects have also been implicated in the longer wavelength emission bands of PFs, and a report by Bradley and coworkers showed the necessity of close contacts (fluorenone-fluorenone dipole-dipole interaction) for this emission in a series of fluorene oligomers containing fluorenone ''defects''. 44 Work by Veinot 45,46 has shown that polyaromatic ethers serve to reduce the dipoledipole interaction in PF films. By analogy we believe that the alkyloxyfuran side groups in PFO(X) and maleimide in PC can behave in much the same manner, with the PFO(X) backbone interacting preferably though p-interactions with either furan or maleimide and through dipole-dipole interactions with maleimide thus minimizing the unwanted longer wavelength emission.…”

Section: Spectral Characterizationmentioning

confidence: 99%