Colloidal Solutions of Organic Conductive Nanoparticles

de, Dominique; Souque, Matthieu; Faulmann, Christophe; Coppel, Yannick; Valade, Lydie; Fraxedas, Jordi; Vendier, O.; Courtade, F.

doi:10.1021/la401371c

Cited by 25 publications

(48 citation statements)

References 29 publications

(44 reference statements)

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“…sticks and nanopowder) do not influence the thermal behavior of both materials. Moreover, the investigated materials are thermally stable up to 180-190 °C, which is in good agreement with the results of de Caro et al [15].…”

Section: Characterization Methodssupporting

confidence: 92%

“…The amphiphilic molecule, acting as a stabilizing agent, controlled the particle growth through coordination to the metal centre. We have recently shown that octylamine could also stabilize 40 nm-TTFTCNQ nanoparticles, in which TCNQ-OA (TCNQ whose a CN group has been substituted by an amino group) molecules were present at the particles surface and were responsible for their stabilization and their dispersibility in common organic solvents [15]. Furthermore, we have recently published the preparation of (TMTSF) 2 ClO 4 nanocrystals (TMTSF: tetramethyltetraselenafulvalene) using the electrocrystallisation technique in the presence of N-octylfurfuryl-imine ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Molecular conductors as nanoparticles in the presence of long-chain alkyl imidazolium salts or amphiphilic molecules

Foulal

Hajjaji

Trif

et al. 2016

J Therm Anal Calorim

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Nanoparticles of two molecule-based conductors namely, TTFTCNQ and TTF[Ni(dmit) 2 ] 2 , have been prepared in organic solution in the presence of ionic or non-ionic species bearing a long-chain alkyl group, acting as growth controlling agents. The size, morphology and state of dispersion of the nanoparticles depended on the nature of the growth-controlling agent and the reaction temperature. In the presence of a long-chain-alkyl-based ionic liquid at -50 °C, electron micrographs evidence that TTFTCNQ nano-objects are frequently elongated, whereas TTF[Ni(dmit) 2 ] 2 nanoparticles are aggregated. In the presence of a neutral long-chain-alkyl-based imine at room temperature, nanoparticles are spherical (mean diameter less than 20 nm) and well dispersed. Vibration spectra evidence that the amounts of charge transfer for TTFTCNQ and TTF[Ni(dmit) 2 ] 2 as nano-objects are very similar to those for the same phases as bulk materials. According to the thermoanalytical investigations, the prepared nanoparticles are stable thermally up to approximately 200 °C, their decomposition is generally a multi-step process. Their heat treatment results in various sulfur containing volatiles (CS 2 , SO 2 , H 2 S), moreover HCN is also detected in the case of nitrogen containing molecules (TCNQ).

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Section: Characterization Methodssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Molecular conductors as nanoparticles in the presence of long-chain alkyl imidazolium salts or amphiphilic molecules

Foulal

Hajjaji

Trif

et al. 2016

J Therm Anal Calorim

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“…Therefore, research focuses on their preparation in forms transferable onto surfaces, and on the study of the consequences of the final morphology on physical properties. For example, colloidal solutions of TTF-TCNQ NPs (TCNQ = tetracyanoquinodimethane) offer promising applications, [7] a chemistry-based technique for patterning films of (BEDT-TTF) 2 I 3 on a polymeric substrate was described, [8] and surface-selective deposition of TTF-TCNQ, TTF[Ni(dmit) 2 ] 2 , and (BEDT-TTF) 2 I 3 NPs was applied to the construction of organic transistor structures.…”

Section: Introductionmentioning

confidence: 99%

Four Molecular Superconductors Isolated as Nanoparticles

Faulmann

Valade

et al. 2014

Eur J Inorg Chem

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Upon reduction of a 1H‐cyclobuta[de]naphthalene‐4,5‐diylbis(diarylmethylium) species, a new CC bond is formed between the Cα and Cortho atoms of the two chromophores, which presents an unprecedented coupling pattern for the dimerization of two trityl units. By attaching an annulated cyclobutane ring at the opposite peri position of the naphthalene core, the distance between the Cα carbon atoms was elongated beyond the limit of σ‐bond formation through “scissor effects”. The suppression of CαCα bond formation, which would lead to hexaphenylethane‐type compounds, is key to the first successful isolation of the α,o‐adducts. The 5‐diarylmethylene‐6‐triarylmethyl‐1,3‐cyclohexadiene unit in the α,o‐adducts is stable, and isomerization of the cyclohexadiene unit into an aromatic system was not observed. The newly formed CαCortho bond was cleaved upon two‐electron oxidation to regenerate the dicationic dye.

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“…(b) Temperature dependency of the resistance of a fiber-like shown that the preferred morphology of TTF[Ni(dmit) 2 ] 2 is elongated in the majority of molecular conductors: single crystals are needle-like and most thin films are made of microfibers. The growth of this phase and that of other molecular conductors as spherical nanoparticles was a synthesis challenge, which the "Molecules and Materials" team addressed successfully by adding stabilizing molecules to the reaction medium[46,89].…”

mentioning

confidence: 99%

“…We have developed methods for preparing molecular conductors as nanoparticles because they can be stored and used directly better as suspensions or as colloidal solutions when preparing films or composite materials.Colloidal solutions were prepared successfully with two conducting materials: TTF-TCNQ[89,97] and nickel ethylene tetrathiolate polymers[98]. We obtained stable dispersions of TTF[Ni(dmit) 2 ] 2 as well as other molecular conductors and superconductors, particularly Bechgaard salts[99] and (BEDT-TTF) 2 I 3[46].…”

mentioning

confidence: 99%