TTF[Ni(dmit)2]2: Now as Thin Films and Nanowires

Valade, Lydie; Casellas, Hélène; Roques, Stéphalle; Faulmann, Christophe; de, Dominique; Zwick, A.; Aries, L.

doi:10.1006/jssc.2002.9695

Cited by 23 publications

(11 citation statements)

References 18 publications

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“…The Raman spectrum shown in Figure 2b is in excellent agreement with that reported for TTF[Ni(dmit) 2 ] 2 single crystals. [15] Furthermore, the signal-to-noise ratio is as good as that CT degree of about 0.86. [21] This value is in relatively good agreement with that obtained from band structure calculations (0.80).…”

Section: ±1mentioning

confidence: 99%

“…10 lm thick) electrically deposited (at 25 lA cm ±2 ) on Pt foil as the substrate exhibited a dendritic structure and have shown bistable electrical switching and memory phenomena. [13] Moreover, thin films of TTF derivatives, such as TTF±TCNQ (TCNQ = tetracyanoquinodimethane), [8c] [TTF±(OH)TEMPO]TCNQ (TEMPO = N,N,Ntrimethyl-1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl), [14] or TTF- [15] [15] Depending on the stirring conditions used, continuous films or agglomerates of nanowires are obtained with r RT~2 .5 S cm ±1 . Therefore, in our electrodeposited films, observation of spherical grains in close contact may seem surprising to some extent.…”

Section: ±1mentioning

confidence: 99%

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Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates

de¹,

Fraxedas

Faulmann

et al. 2004

Advanced Materials

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Dedicated to Patrick Cassoux to let him know that the dream of a TTF[Ni(dmit) 2 ] 2 -based device may come true!The preparation of thin films of crystalline molecular organic materials with specific physical properties (magnetic order, metallic behavior, superconductivity, etc.) is an active field boosted by the ever-increasing availability of remarkable new materials and their potential applications.[ , due to the high conduction activation barriers induced by grain boundaries.[2]Here, we present results on the preparation of metallic thin films of the molecular metal TTF[Ni(dmit) 2 ] 2 , where dmit 2± = 1,3-dithiole-2-thione-4,5-dithiolato, by electrocrystallization, using silicon wafers as electrodes. TTF[Ni(dmit) 2 ] 2 single crystals (obtained by a diffusion process) exhibit metallic behavior down to 3 K, with r RT~3 00 S cm ±1 and superconductivity is observed at T c = 1.6 K under application of a hydrostatic pressure of 7 kbar.[6] Our films exhibit metallic character down to ca. 12 K in spite of their polycrystalline morphology. Electrocrystallization is the most suitable technique to obtain charge transfer (CT) compounds. [7] The advantages of this technique over, e.g., vapor-phase deposition methods [8] include precise control of the concentration of solute at the interface, the ability to fabricate thin films on substrates with unusual geometries, and the fact that vapor-phase deposition is limited to sublimation/evaporation of neutral species. Although the electrocrystallization technique has been extensively used, the utilization of substrates as electrodes is rare. [9] On the other hand, there is great interest in characterizing hybrid organic±silicon structures. Molecular materials have been shown to be complementary to inorganic-based materials (organic light-emitting diodes, organic thinfilm transistors, etc.), and certain applications are receptive to their substitution because they can be processed as thin films at lower cost.[10]Electrodeposition of TTF[Ni(dmit) 2 ] 2 was carried out with intrinsic Si(001) as the anode and a platinum wire as the cathode. We have selected silicon single crystals as substrates in order to eliminate spurious effects associated with grain boundaries, avoiding, e.g., non-homogeneous current densities. The anodic oxidation of the TTF is performed at constant current density (1.5 lA cm ±2 ) at room temperature. Within 5 days, a black air-stable thin film is formed on the polished face of the (001) Si(001) wafers as anodes in an electrocrystallization process. Scanning electron microscopy (SEM) micrographs of a covered area show a dense film made of roughly spherical grains with sizes ranging from 0.6 to 1 lm (Fig. 1). The estimated thickness of the films is ca. 1 lm. Other works have reported quite different morphologies. Applying a low current density (< 5 lA cm ±2 ), Wang et al. reported electrodeposited films of (BEDT-TTF) 2 PF 6 as 100 lm long needles.[9] When the current density values were increased (> 10 lA cm ±2 ), they ob-

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Section: ±1mentioning

confidence: 99%

Section: ±1mentioning

confidence: 99%

Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates

de¹,

Fraxedas

Faulmann

et al. 2004

Advanced Materials

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“…The first attempts to grow films of TTF[Ni(dmit) 2 ] 2 used a dipping process and stainless steel conversion coating, silicon conversion coating, or microrough silicon as substrates [81,82].…”

Section: Thin Films Of Ttf[ni(dmit) 2 ]mentioning

confidence: 99%

“…Scanning electron microscopy (SEM) images of TTF[Ni(dmit) 2 ] 2 deposits: (a) on stainless steel conversion coating, (b) on silicon conversion coating, and (c) on microrough silicon. These figures have been reproduced from[81] with the permission of the copyright holders.…”

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confidence: 99%

TTF[Ni(dmit)2]2: From single-crystals to thin layers, nanowires, and nanoparticles

Valade¹,

de²,

Faulmann³

et al. 2016

Coordination Chemistry Reviews

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“…1, has attracted much attention [1], since the first efficient syntheses were reported in the 1970s [2]. The great interest in metal complexes of these ligands, especially of d 8 transition metals of [dmit] 2À has stemmed largely from such applications as superconducting materials [3][4][5][6][7][8]. Moreover, much attention has been paid to their uses in other applications including as chemosensors [9], transistors [10], magnetic [11][12][13][14] and non-linear optical materials [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Syntheses of bis(organomercury)1,3-dithiole-2-thione-4,5-dithiolates and related compounds: Crystal structure of bis(phenylmercury)1,3-dithiole-2-one-4,5-dithiolate

Martins

Ferreira

Howie

et al. 2015

Inorganica Chimica Acta

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TTF[Ni(dmit)2]2: Now as Thin Films and Nanowires

Cited by 23 publications

References 18 publications

Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates

Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates

TTF[Ni(dmit)2]2: From single-crystals to thin layers, nanowires, and nanoparticles

Syntheses of bis(organomercury)1,3-dithiole-2-thione-4,5-dithiolates and related compounds: Crystal structure of bis(phenylmercury)1,3-dithiole-2-one-4,5-dithiolate

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TTF[Ni(dmit)2]2: Now as Thin Films and Nanowires

Cited by 23 publications

References 18 publications

Metallic Thin Films of TTF[Ni(dmit)2]2 by Electrodeposition on (001)‐Oriented Silicon Substrates

Metallic Thin Films of TTF[Ni(dmit)2]2 by Electrodeposition on (001)‐Oriented Silicon Substrates

TTF[Ni(dmit)2]2: From single-crystals to thin layers, nanowires, and nanoparticles

Syntheses of bis(organomercury)1,3-dithiole-2-thione-4,5-dithiolates and related compounds: Crystal structure of bis(phenylmercury)1,3-dithiole-2-one-4,5-dithiolate

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Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates

Metallic Thin Films of TTF[Ni(dmit)₂]₂ by Electrodeposition on (001)‐Oriented Silicon Substrates