Alignment of photoconductive self-assembled fibers composed of π-conjugated molecules under electric fields

Shoji, Yoshiko; Yoshio, Masafumi; Yasuda, Takuma; Funahashi, Masahiro; Kato, Takashi

doi:10.1039/b915822g

Cited by 35 publications

(28 citation statements)

References 58 publications

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“…TheP OM image confirms the nucleation from the anode and the fiber growth towards the cathode only when the pores align in the DC field direction. To the best of our knowledge,s uch ap recise bridging configuration is unprecedented in the literature,e ither by using top-down techniques such as zone-casting [14] or by orienting organogelators [15] and liquid crystal polymers [16][17][18][19] in an AC field.…”

Section: Angewandte Chemiementioning

confidence: 99%

Supramolecular Electropolymerization

et al. 2018

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Gaining control over supramolecular polymerization mechanisms is of high fundamental interest to understand self-assembly and self-organization processes at the nanoscale.Itisalso expected to significantly impact the design and improve the efficiency of advanced materials and devices. Up to now, supramolecular polymerization has been shown to take place from unimers in solution, mainly by variations of temperature or of concentration. Reported here is that supramolecular nucleation-growth of triarylamine monomers can be triggered by electrochemistry in various solvents.T he involved mechanism offers new opportunities to precisely address in space and time the nucleation of supramolecular polymers at an electrode.T oi llustrate the potential of this methodology,s upramolecular nanowires are grown an oriented over several tens of micrometers between different types of commercially available electrodes submitted to asingle DC electric field, reaching ap recision unprecedented in the literature.

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Section: Angewandte Chemiementioning

confidence: 99%

Supramolecular Electropolymerization

et al. 2018

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“…In addition to the above parameters, the use of electrical field for alignment and placement of organic electronic materials has also been reported in examples such as alignment of liquid crystals and OSC crystallites, manipulation of OSC solution droplets, self‐assembly of organic fibers, and morphology modification of polymer blends . These works were mostly descriptive and proposed heuristic explanations to the interaction between field and matter.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Molina‐Lopez

Yan

et al. 2017

Adv Funct Materials

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Recent improvements in solution-coated organic semiconductors (OSCs) evidence their high potential for cost-efficient organic electronics and sensors. Molecular packing structure determines the charge transport property of molecular solids. However, it remains challenging to control the molecular packing structure for a given OSC. Here, the application of alternating electric fields is reported to fine-tune the crystal packing of OSC solution-shearing coated at ambient conditions. First, a theoretical model based on dielectrophoresis is developed to guide the selection of the optimal conditions (frequency and amplitude) of the electric field applied through the solutionshearing blade during coating of OSC thin films. Next, electric field-induced polymorphism is demonstrated for OSCs with both herringbone and 2D brickwall packing motifs in 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene and 6,13-bis(triisopropylsilylethynyl) pentacene, respectively. Favorable molecular packing can be accessible in some cases, resulting in higher charge carrier mobilities. This work provides a new approach to tune the properties of solution-coated OSCs in functional devices for highperformance printed electronics.

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“…[ 2,7,8 ] While the order within an assembly (nanometer scale) is extremely high, when dispersed, most supramolecular materials form macroscopically isotropic assemblies. [11][12][13][14] So far, different strategies toward macroscopic alignment of polymeric and supramolecular materials have been developed, including photolithography, [ 15,16 ] soft lithography, [ 3,16 ] electrospinning, [17][18][19] electric [20][21][22][23] and magnetic [ 24,25 ] fi eld alignment, as well as shear fl ow alignment. Examples where such control is highly benefi cial or even crucial for device performance are in optoelectronic devices [8][9][10] and in tissue engineering, where a macroscopically organized polymer scaffold is necessary for the growth of highly aligned tissue, such as muscle fi bers and neural tissue.…”

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confidence: 99%

Patterning of Soft Matter across Multiple Length Scales

Asdonk

Hendrikse

Romera

et al. 2016

Adv Funct Materials

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2609wileyonlinelibrary.com at the moment. [ 2,7,8 ] While the order within an assembly (nanometer scale) is extremely high, when dispersed, most supramolecular materials form macroscopically isotropic assemblies. Moreover, spatial control at device dimensions is challenging. Examples where such control is highly benefi cial or even crucial for device performance are in optoelectronic devices [8][9][10] and in tissue engineering, where a macroscopically organized polymer scaffold is necessary for the growth of highly aligned tissue, such as muscle fi bers and neural tissue. [11][12][13][14] So far, different strategies toward macroscopic alignment of polymeric and supramolecular materials have been developed, including photolithography, [ 15,16 ] soft lithography, [ 3,16 ] electrospinning, [17][18][19] electric [20][21][22][23] and magnetic [ 24,25 ] fi eld alignment, as well as shear fl ow alignment. [ 9,11 ] These techniques all have demonstrated their benefi ts, but also strong limitations such as incompatibility with (aqueous) soft matter, low susceptibilities, and/or poor spatial control across multiple length scales.In this manuscript, we use liquid crystal (LC) templating with patternable substrates to obtain full spatial control in our self-assembled materials. This approach has numerous advantages: (i) it does not depend on specifi c interactions between the assembly and the template and thus it can be applied to a wide range of materials; (ii) any desired (hierarchical) structure can be imprinted on the substrate and reproduced in the assembly; (iii) the desired product can be (chemically) modifi ed after organization (in our case to generate optically active π-conjugated polymers); and (iv) the template can be removed which only leaves the functional material on the substrate. In nonaqueous solvents (bulk thermotropic liquid crystals), the concept of LC templating was demonstrated successfully [ 10,[26][27][28][29][30][31] but in aqueous solutions unidirectional alignment at large length scales is rarely realized, let alone locally controlled. [ 32 ] The limited success in water is related to the amphiphilic lyotropic LCs that are notoriously diffi cult to align on commonly used substrates such as rubbed polyimide. [ 33,34 ] In addition, these lyotropic LCs are incompatible with electric fi elds (because of dielectric and Joule heating as well electrochemical degradation), and they can interfere with the desired self-assembly process of a supramolecular material. [ 35 ] To overcome these disadvantages, we use a template of a lyotropic chromonic LC (LCLC) which is a rigid plank-like molecule Controlling the organization of functional supramolecular materials at both short and long length scales as well as creating hierarchical patterns is essential for many biological and electrooptical applications. It remains however an extremely challenging objective to date, particularly in water-based systems. In this work, it is demonstrated that water-processable self-assembling materials can be organized from mic...

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Alignment of photoconductive self-assembled fibers composed of π-conjugated molecules under electric fields

Cited by 35 publications

References 58 publications

Supramolecular Electropolymerization

Supramolecular Electropolymerization

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Patterning of Soft Matter across Multiple Length Scales

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