Hierarchical assembly of light-emitting polymer nanofibers in helical morphologies

Pagliara, Stefano; Camposeo, Andrea; Cingolani, R.; Pisignano, Dario

doi:10.1063/1.3275727

Cited by 17 publications

(21 citation statements)

References 29 publications

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“…More reproducible methods to generate fibers into well-defined arrays with hierarchical structures are needed [191]. As these electrospinning techniques are perfected, and through interdisciplinary collaborations, electrospinning is expected to become more significant in the fields of nanotechnology and bioengineering [143]. …”

Section: Discussionmentioning

confidence: 99%

“…A tilted glass slide was used as the collector and it was found that tilt angles greater than 45° did not result in helical fibers [142]. Helical light-emitting conjugated polymers in which the polymer molecular weight affects the loop size and corresponding color shift have also been fabricated using the electrospinning technique [143]. The fibers with the most stretched helical geometries were formed from polymer solutions with the highest molecular weights.…”

Section: Helicalmentioning

confidence: 99%

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Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

130

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Abstract:Traditional electrospun nanofibers have a myriad of applications ranging from scaffolds for tissue engineering to components of biosensors and energy harvesting devices. The generally smooth one-dimensional structure of the fibers has stood as a limitation to several interesting novel applications. Control of fiber diameter, porosity and collector geometry will be briefly discussed, as will more traditional methods for controlling fiber morphology and fiber mat architecture. The remainder of the review will focus on new techniques to prepare hierarchically structured fibers. Fibers with hierarchical primary structures-including helical, buckled, and beads-on-a-string fibers, as well as fibers with secondary structures, such as nanopores, nanopillars, nanorods, and internally structured fibers and their applications-will be discussed. These new materials with helical/buckled morphology are expected to possess unique optical and mechanical properties with possible applications for negative refractive index materials, highly stretchable/high-tensile-strength materials, and components in microelectromechanical devices. Core-shell type fibers enable a much wider variety of materials to be electrospun and are expected to be widely applied in the sensing, drug delivery/controlled release fields, and in the encapsulation of live cells for biological applications. Materials with a hierarchical secondary structure are expected to provide new superhydrophobic and self-cleaning materials.

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Section: Discussionmentioning

confidence: 99%

Section: Helicalmentioning

confidence: 99%

Hierarchically Structured Electrospun Fibers

Zander

2013

Polymers

130

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“…This can be attributed to the stretching of the liquid jet which can favor a more extended conformation of the backbones, as also confirmed by observed longer PL lifetimes 54. Emission spectra are typically comparable to spin‐cast films, or display a small blue‐shift 31, 84. These effects can be related to changes in the nanoscale environment that can perturb the local refractive index (particularly in fibers fabricated by blending conjugated molecules with inert polymers), and to suppression of exciton migration toward sites of lower energy.…”

Section: Applications Of Active Nanofibersmentioning

confidence: 64%

“…These effects can be related to changes in the nanoscale environment that can perturb the local refractive index (particularly in fibers fabricated by blending conjugated molecules with inert polymers), and to suppression of exciton migration toward sites of lower energy. Moreover, self‐absorption within the organic material and scattering effects can significantly modify the shape of the emitted spectra, thus determining a rich observable phenomenology 84–87…”

Section: Applications Of Active Nanofibersmentioning

confidence: 99%

Light‐Emitting Electrospun Nanofibers for Nanophotonics and Optoelectronics

Camposeo

Persano

Pisignano

2012

Macro Materials & Eng

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120

106

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The processing, properties, and applications of electrospun light‐emitting nanofibers are reviewed. The different experimental approaches for electrospinning conjugated polymers and light‐emitting compounds are presented. The characterization of the optoelectronic properties of electrospun conjugated polymer nanofibers evidences intriguing features, such as polarized emission, self‐waveguiding, enhanced energy transfer, and charge transport. The applications of such nanostructured materials include polarized light sources for lab‐on‐chip devices, nanoscale organic light‐emitting diodes and optically pumped lasers, field‐effect transistors, and high‐performance optical sensors. Future challenges and perspectives of electrospun light‐emitting nanofibers are also discussed.

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“…ES has emerged as a successful method to pattern various types of polymeric nanofibers on a large scale [29], and has applications in the fields of sensors and actuators [30][31][32][33], energy storage [34,35], smart textiles [36][37][38][39], optoelectronics [40,41], tissue engineering [42][43][44][45], prosthetics [46], drug delivery [47,48], microresonators [49], and piezoelectric energy generators [50]. Just like in DPL, in ES a material is deposited on a surface from an ink solution.…”

Section: Electrospinningmentioning

confidence: 99%