Solution-Mediated Selective Nanosoldering of Carbon Nanotube Junctions for Improved Device Performance

Won, June; Chang, Ning; Estrada, David; Lian, Feifei; Cha, Hyeongyun; Duan, Xiangyun J.; Haasch, Richard T.; Pop, Eric; Girolami, Gregory S.; Lyding, Joseph W.

doi:10.1021/nn505552d

Cited by 15 publications

(10 citation statements)

References 77 publications

(116 reference statements)

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“…Charge transport through networks of SWNTs is limited by the junctions between SWNTs. ,− The presence of a polymer wrapping on the SWNTs reduces the probability of charge tunneling between SWNTs, contributing to the resistance of the SWNT network. , After spin-coating a film of the SWNT solution, supramolecular polymer 1 was released by soaking in a 1% solution of TFA/toluene for 30 s followed by rinsing in toluene for 30 s. This process provides improved dispersion of the SWNTs compared to the previously described method, which involved removing the sorting polymer in solution and then redispersing the SWNTs in an organic solvent. The solution-phase release process results in extensive aggregation in solution so that large bundles are deposited onto the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…The log plots of the transfer curves from Figure e,f are included in Figure S8. Understanding the role of junctions between SWNTs has been a key challenge in the field. − ,,, For example, Gao et al proposed that the temperature-dependent properties of TFT transistors should follow the fluctuation-induced tunneling (FIT) model for polymer-wrapped SWNT and should follow the variable range hopping (VRH) model for bare SWNTs. The sorting process described here provides a method to directly measure the effect of polymer wrapping on SWNT junction behavior in transistors and other devices.…”

Section: Resultsmentioning

confidence: 99%

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Universal Selective Dispersion of Semiconducting Carbon Nanotubes from Commercial Sources Using a Supramolecular Polymer

et al. 2017

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Selective extraction of semiconducting carbon nanotubes is a key step in the production of high-performance, solution-processed electronics. Here, we describe the ability of a supramolecular sorting polymer to selectively disperse semiconducting carbon nanotubes from five commercial sources with diameters ranging from 0.7 to 2.2 nm. The sorting purity of the largest-diameter nanotubes (1.4 to 2.2 nm; from Tuball) was confirmed by short channel measurements to be 97.5%. Removing the sorting polymer by acid-induced disassembly increased the transistor mobility by 94 and 24% for medium-diameter and large-diameter carbon nanotubes, respectively. Among the tested single-walled nanotube sources, the highest transistor performance of 61 cm/V·s and on/off ratio >10 were realized with arc discharge carbon nanotubes with a diameter range from 1.2 to 1.7 nm. The length and quality of nanotubes sorted from different sources is compared using measurements from atomic force microscopy and Raman spectroscopy. The transistor mobility is found to correlate with the G/D ratio extracted from the Raman spectra.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Universal Selective Dispersion of Semiconducting Carbon Nanotubes from Commercial Sources Using a Supramolecular Polymer

et al. 2017

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“…10,11 Recently, our group successfully demonstrated a method to enhance CNT interactions in electronic devices constructed from CNT networks: nanosoldering, in which a metal "nanosolder" is locally deposited at the CNT junctions. 12,13 The nanosoldering is achieved by passing a current through a CNT network in the presence of a metal chemical vapor deposition (CVD) precursor; the current causes localized heating at the more resistive CNT junctions, inducing selective thermal decomposition of the precursor that encases the CNT junctions with metal nanoparticles. In initial implementations, however, this method afforded a nanosolder that was in physical contact with but not bonded covalently to the CNTs, and this lack of covalency limited the improvement in the electronic and mechanical connection at the CNT junctions.…”

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confidence: 99%

Enhanced Electrical and Mechanical Properties of Chemically Cross-Linked Carbon-Nanotube-Based Fibers and Their Application in High-Performance Supercapacitors

et al. 2019

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The electrical conductivity and mechanical strength of fibers constructed from single-walled carbon nanotubes (CNTs) are usually limited by the weak interactions between individual CNTs. In this work, we report a significant enhancement of both of these properties through chemical cross-linking of individual CNTs. The CNT fibers are made by wet-spinning a CNT solution that contains 1,3,5-tris(2′-bromophenyl)benzene (2TBB) molecules as the cross-linking agent, and the cross-linking is subsequently driven by Joule heating. Cross-linking with 2TBB increases the conductivity of the CNT fibers by a factor of ∼100 and increases the tensile strength on average by 47%; in contrast, the tensile strength of CNT fibers fabricated without 2TBB decreases after the same Joule heating process. Symmetrical supercapacitors made from the 2TBB-treated CNT fibers exhibit a remarkably high volumetric energy density of ∼4.5 mWh cm–3 and a power density of ∼1.3 W cm–3.

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“…Moreover, in the case of the mixed Pd(OAc) 2 +CNTs sample, the process of Pd 0 oxidation can lead to the destruction of CNTs topology structure, further promoting the fast decomposition of CNTs. The final residues (≈15 wt.%) corresponds to the production of PdO or Pd 0 together with some carbon contamination …”

Section: Figurementioning

confidence: 99%

“…The final residues ( % 15 wt.%) corresponds to the production of PdO or Pd 0 together with some carbon contamination. [4] To furthere xclude the effects of carbon support, the thermal decomposition behaviors of Pd(OAc) 2 + ZSM-5 and Pd(OAc) 2 + SiO 2 samples were measured and evaluated in air by TG analysis. The decomposition temperature of Pd(OAc) 2 decreases to 175 8Ca nd 137 8Cf rom 215 8Ci nt he presence of ZSM-5 and SiO 2 ,r espectively.A lso, the increased weighte xists from 400 8C to 550 8Cd ue to Pd oxidation.…”

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confidence: 99%

Low‐Temperature Fast Production of Carbon and Acetic Acid Dual‐Promoted Pd/C Catalysts

Yao

Chen

et al. 2019

Chemistry A European J

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The Pd/C catalysts are widely used in synthesis of fine chemicals in industry, but their production suffers from a complicated two‐step process involving impregnation and reduction, and requires large amounts of solvents and reductant, which would lead to a series of issues such as time consumption, resource waste and environmental pollution. Herein, ultra‐small Pd nanoparticles uniformly anchored on carbon nanotubes (Pd/CNTs) were synthesized by using a one‐pot and low‐temperature reduction strategy. The present process/technology is very sensitive to and controlled by the supports and solvents, and the carbon support and acetic acid synergistically play crucial and decisive roles in the fast production of Pd/C catalysts. Also, the used solvents can be recycled and reutilized, which meets the requirements of sustainable chemistry and green economy. When the as‐obtained Pd/CNTs catalyst was used to catalyze the oxidation of benzyl alcohol to benzaldehyde, it achieved a conversion efficiency as high as 99.3 % and a high selectivity up to >99.9 %. The simple, scalable and environmentally friendly strategy can be extended to anchor Pd nanoparticles on various carbon substrates, which sheds a new light on the synthesis of Pd/C catalysts.

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Solution-Mediated Selective Nanosoldering of Carbon Nanotube Junctions for Improved Device Performance

Cited by 15 publications

References 77 publications

Universal Selective Dispersion of Semiconducting Carbon Nanotubes from Commercial Sources Using a Supramolecular Polymer

Universal Selective Dispersion of Semiconducting Carbon Nanotubes from Commercial Sources Using a Supramolecular Polymer

Enhanced Electrical and Mechanical Properties of Chemically Cross-Linked Carbon-Nanotube-Based Fibers and Their Application in High-Performance Supercapacitors

Low‐Temperature Fast Production of Carbon and Acetic Acid Dual‐Promoted Pd/C Catalysts

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