Electrostatic Self-Assembly of Polydiacetylene Nanocrystals:  Nonlinear Optical Properties and Chain Orientation

He, Jin‐An; Yang, Ke; Kumar, and Jayant; Tripathy, Sukant K.; Samuelson, Lynne A.; Oshikiri, Toshiyuki; Katagi, Hideyuki; Kasai, Hitoshi; Okada, Shuji; Oikawa, and Hidetoshi; Nakanashi, Hachiro

doi:10.1021/jp992633+

Cited by 38 publications

(22 citation statements)

References 46 publications

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“…[3][4][5][6][7][8] These crystal sizes are more than ten times larger than those of semiconductor quantum dots which show the same amount of blueshift. Similar size-dependent blueshifts are observed also for polymer nanocrystals such as poly-diacetylene nanocrystals for the sizes of the order of 100 nm, 9 which is also of great interest.…”

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confidence: 52%

Effect of light scattering on the transmission spectra of organic nanocrystals

Ishino

Nair

Nakagawa

et al. 2011

Applied Physics Letters

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The effect of light scattering on the extinction spectra of organic nanocrystals was investigated by absorption and extinction measurement and by theoretical calculation for typical organic nanocrystals of a-perylene. In the extinction spectra, the exciton band shows a size-dependent redshift and tail toward longer wavelengths due to scattering as the crystal size is increased beyond $50 nm. In the absorption spectra, the exciton band blueshifts from that in the bulk crystal for crystal sizes less than $200 nm due to the anisotropic exciton structure in perylene. The calculation qualitatively supports these results. The effect of scattering always makes the extinction band redshift from the absorption band. V

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confidence: 52%

Effect of light scattering on the transmission spectra of organic nanocrystals

Ishino

Nair

Nakagawa

et al. 2011

Applied Physics Letters

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“…19a and b). The nanocrystals of PDA have been used advantageously to fabricate deposited films using layer-by-layer deposition 95,96 and encapsulation 97 methods. Owing to the softened crystal lattice 98 and large surface area, the electrical properties of PDA nanocrystals are also superior to those of bulk counterparts.…”

Section: Three Dimensional (3d) Polydiacetylenes 41 Pda Crystalsmentioning

confidence: 99%

Polydiacetylenes: supramolecular smart materials with a structural hierarchy for sensing, imaging and display applications

et al. 2012

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While a large variety of conjugated polymers exist, polydiacetylenes (PDAs) remain a major research area among scientists due to their interesting optical, spectral, electronic, and structural properties. Heavily reviewed in regards to their stimuli responsive properties, much is known about the assortment of sensing and detection capabilities of PDAs. In this article, we look more upon the structural diversities of polydiacetylenes that have been achieved in recent years, particularly from a hierarchical perspective of 1, 2, and 3-dimensional configurations. In addition, we examine how these different dimensional arrangements of PDAs have heralded clear applications in several key areas. Successful integration of these stimuli-responsive "smart" materials into various geometries has required researchers to have a comprehensive understanding of both the fabrication and synthesis processes, as well as the signalling mechanism for the optical, fluorogenic or spectral transitions. The on-going discovery of new PDA formulations continues to provide interesting structural manifestations such as liposomes, tubes, fibres, organic/inorganic incorporated hybrids and composite structures. By highlighting some of the recent conceptual and technological developments, we hope to provide a measure of the current pace in new PDA derivative development as core components in efficient sensor, imaging and display systems.

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“…The electronic properties of organic nanoparticles differ fundamentally from those of inorganic ones because of weak intermolecular forces formed by the interactions of van der Waals type or hydrogen bonding [3]. Organic nanostructures allow much increased variability and flexibility in synthesis of materials in electronics and photonics [4,5]. Organic nanoparticles are fascinating from a fundamental point of view because their optical properties on absorption and emission depend on their size [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Rod-coil Molecules bearing Oligo-Phenylene Vinylene Motifs: Effect of PEO Chain Lengths on the Evolution of Nanostructures Morphology and their Photophysical Properties

Bhongale

2019

Adv. Mater. Lett.

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The applications of nano-dispersed organic conjugated active compounds or materials as well as current research is concerned mainly with optimization and control of the optical properties, by particle size and supramolecular structure of the particles. The aromatic macromolecules consisting of conjugated rigid rod segment and hydrophilic flexible chain as coil in aqueous solution can aggregate into a variety of supramolecular structures through mutual interaction between aromatic rod and hydrophilic chains of molecules and water. Here we report the synthesis of newer oligo phenylene vinylene (OPV) based rod-coil molecules with varying chain-length polyethylene oxide (PEO) repeating units (n = 8, 17, 45). Formation and photophysical properties of their nanostructures in water are studied comparatively. The nanostructures evolution of these molecules is observed with simple reprecipitation method. The stable nanostructures were formed without addition of any surfactants. The fabricated nanostructures ultimately give the materials with 'controlled' aggregation induced enhanced photophysical properties. The self-assembly of such OPV type rod molecules in water without adding any surfactants, therefore, can provide a strategy for the construction of well-defined and stable nanostructures with certain chemical functionalities and physical properties as advanced materials for photonic, electronic and biological applications.

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Electrostatic Self-Assembly of Polydiacetylene Nanocrystals: Nonlinear Optical Properties and Chain Orientation

Cited by 38 publications

References 46 publications

Effect of light scattering on the transmission spectra of organic nanocrystals

Effect of light scattering on the transmission spectra of organic nanocrystals

Polydiacetylenes: supramolecular smart materials with a structural hierarchy for sensing, imaging and display applications

Synthesis of Rod-coil Molecules bearing Oligo-Phenylene Vinylene Motifs: Effect of PEO Chain Lengths on the Evolution of Nanostructures Morphology and their Photophysical Properties

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