Synthesis of Supported Single-Crystalline Organic Nanowires by Physical Vapor Deposition

Borrás, Ana; Aguirre, Myriam H.; Gröening, O.; López-Cartés, C.; Groening, P.

doi:10.1021/cm802172p

Cited by 42 publications

(67 citation statements)

References 29 publications

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“…This arrangement is characteristic of the phthalocyanines' triclinic crystal structure. 14,15,30,31 Furthermore, in the FePc SAED diagram we note an intensity increase of the diffraction dots corresponding approximately to the (210) direction and also a minor one on the (310) direction. These effects could be attributed to the herringbone angle of the molecular arrangement which would be oriented to this direction (i.e., between 20°(210) and 28°(310) from the intercolumn direction).…”

Section: ■ Results and Discussionmentioning

confidence: 62%

“…These molecules self-assemble into supported single-crystal nanowires tens of nanometers in width and several micrometers in length. 14,15,18 Such a heterogeneous crystallization process can be enhanced by including nucleation centers at the substrate to trigger the preferential condensation of molecules on those spots. 14,15 Formation of ONWs has been reported during the last years on an ample variety of surfaces including metal and metal oxide thin films and organic supports.…”

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confidence: 99%

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Self-Assembly of the Nonplanar Fe(III) Phthalocyanine Small-Molecule: Unraveling the Impact on the Magnetic Properties of Organic Nanowires

et al. 2018

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In this article we show for the first time the formation of magnetic supported organic nanowires (ONWs) driven by self-assembly of a nonplanar Fe(III) phthalocyanine chloride (FePcCl) molecule. The ONWs grow by a crystallization mechanism on roughness-tailored substrates. The growth methodology consists of a vapor deposition under low vacuum and mild temperature conditions. The structure, microstructure, and chemical composition of the FePcCl NWs are thoroughly elucidated and compared with those of Fe(II) phthalocyanine NWs by a consistent and complementary combination of advanced electron microscopies and X-ray spectroscopies. In a further step, we vertically align the NWs by conformal deposition of a SiO 2 shell. Such orientation is critical to analyze the magnetic properties of the FePcCl and FePc supported NWs. A ferromagnetic behavior below 30 K with an easy axis perpendicular to the phthalocyanine plane was observed in the two cases with the FePcCl nanowires presenting a wider hysteresis. These results open the path to the fabrication of nanostructured one-dimensional small-molecule spintronic devices. T ailoring material structure at the nanoscale has prompted research on new and exciting properties over the last two decades. This is particularly true for one-dimensional (1D) nanostructures (nanotubes, nanowires, nanorods, or nanobelts) with longitudinal sizes orders of magnitude larger than the cross-sectional sizes.1 Among them, organic nanowires (ONWs) form a family of nanostructures with remarkable optic, electronic, sensing, and wetting properties.2−12 In addition, the development of ONW devices offers potential for low cost and flexible devices and versatility through the molecular design of their building blocks. The methods for the synthesis of these 1D systems generally rely on three approaches including template procedures, solution-phase deposition, and vapor transport. [2][3][4]6,10,13 Condensation from the vapor phase at low pressure (or simply physical vapor deposition, PVD) counts within the last group and presents interesting features such as (i) direct formation of single crystal nanowires with controlled morphology on different substrates; (ii) high adaptability to a large amount of different π-conjugated small molecules; (iii) high growth rate and controlled density of nanowires with appropriated homogeneity; (iv) solventless and one-step synthesis; and (v) straightforward compatibility with other vacuum deposition and processing methods. 2,14−18 The method consists of the low-pressure sublimation of purely organic or metalorganic small-molecules from the bulk crystals counterpart and their condensation on the surface of diverse supports. These molecules self-assemble into supported single-crystal nanowires tens of nanometers in width and several micrometers in length.14,15,18 Such a heterogeneous crystallization process can be enhanced by including nucleation centers at the substrate to trigger the preferential condensation of molecules on those spots.14,15 Formation of ONWs...

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Section: ■ Results and Discussionmentioning

confidence: 62%

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confidence: 99%

Self-Assembly of the Nonplanar Fe(III) Phthalocyanine Small-Molecule: Unraveling the Impact on the Magnetic Properties of Organic Nanowires

et al. 2018

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“…Numerous examples are available in the most recent literature where different supported 1D nanostructures are prepared by using wet chemical and electrochemical routes [13], vapour phase condensation methods (e.g. vapour-liquid-solid, VLS methods) [14], solution-phase methods [15], template directed synthesis [16] or other evaporation based approaches [17,18], etc. An important advantage of the 1D over the 2D nanostructures and thin films is the facile fabrication of 1D defect-free heterostructures, and the tailored synthesis of multicomponent materials and heterojunctions with controlled 1D morphology (e.g., core@shell nanofibres, metal decorated CNTs and oxide nanowires, nanobrushes, segmented, cross junctions or branched 1D nanostructures) [10,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Supported plasma-made 1D heterostructures: perspectives and applications

Borrás¹,

Macías-Montero²,

Romero‐Gómez³

et al. 2011

J. Phys. D: Appl. Phys.

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“…[4] Preparation of Hybrid and Connected Nanowires: Recently, we have reported a universal method for the growth of squared nanowires and nanobelts formed by p-conjugated molecules on metal and non-metal substrates. [5] This protocol is based on physical vapor deposition (PVD) of the organic molecules on substrates at controlled temperatures. A high density of supported single-crystalline organic nanowires can be obtained by this methodology.…”

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“…A high density of supported single-crystalline organic nanowires can be obtained by this methodology. [5] The preparation of the silver-decorated organic nanowires is carried out by direct current (DC) sputtering of silver at room temperature on the as-grown nanowires. DC sputtering is a versatile technique for producing metal thin films and nanoparticles (silver, gold, copper, etc.).…”

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Connecting Organic Nanowires

Borrás

Gröning

Köble³

et al. 2009

Advanced Materials

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In this work we report on a universal methodology for connecting organic nanowires and nanosheets formed by p-conjugated molecules via metal nanoparticles. We present a brief study on the electrical characteristics of the thus connected nanowires carried out in a four-tip-STM manipulation and measurement system (4TMMS; STM ¼ scanning tunneling microscopy) under ultrahigh vacuum (UHV) conditions.The recent developments in organic semiconducting nanostructures have permitted important advances in the fabrication of low-cost, large-area, flexible optic and microelectronic devices.[1] In fact, over the last few years the use of p-conjugated molecules as building blocks for such organic nanostructures has received special attention and interest.[1] Within the class of p-conjugated molecules, the families of metallo porphyrins, metallo phthalocyanines, and perylenes are promising materials for varying applications such as vapor (gas) nanosensors and as active components for photonic devices, organic field effect transistors (OFETs), phototransistors, and solar cells.[2] It has been realized that the fabrication of hybrid organic!inorganic materials comprising semiconducting organic nanowires and metal particles opens new routes in the design of devices' functionality.[3] Such hybrid materials may provide a ideal model system for the study of organic!inorganic nanomaterials. Despite this promising prospect, only very few works exist regarding the formation of organic semiconducting nanofibers!metal particles hybrid systems. [3b-d,f ] In this Communication, we present a significant step forward in the fabrication of nanowire-metal-nanowire junctions by using metal nanoparticle-decorated organic nanowires as a base for the growth of secondary nanowires in such a way that a new route for the fabrication of connected organic single-crystal nanowires is demonstrated.First, we describe the organic/inorganic hybrid nanostructures prepared by decorating single-crystal organic nanowires with metal particles in a one-step dry process at room temperature. In a second step we demonstrate an unprecedented class of heterostructured nanowires formed by connection through metal nanoparticles of different organic nanostructures. Finally, the electrical conductivity of these connected nanowires is studied in a 4TMMS. [4] Preparation of Hybrid and Connected Nanowires: Recently, we have reported a universal method for the growth of squared nanowires and nanobelts formed by p-conjugated molecules on metal and non-metal substrates.[5] This protocol is based on physical vapor deposition (PVD) of the organic molecules on substrates at controlled temperatures. A high density of supported single-crystalline organic nanowires can be obtained by this methodology.[5]The preparation of the silver-decorated organic nanowires is carried out by direct current (DC) sputtering of silver at room temperature on the as-grown nanowires. DC sputtering is a versatile technique for producing metal thin films and nanoparticles (silver, gold, copper, etc.)....

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Synthesis of Supported Single-Crystalline Organic Nanowires by Physical Vapor Deposition

Cited by 42 publications

References 29 publications

Self-Assembly of the Nonplanar Fe(III) Phthalocyanine Small-Molecule: Unraveling the Impact on the Magnetic Properties of Organic Nanowires

Self-Assembly of the Nonplanar Fe(III) Phthalocyanine Small-Molecule: Unraveling the Impact on the Magnetic Properties of Organic Nanowires

Supported plasma-made 1D heterostructures: perspectives and applications

Connecting Organic Nanowires

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