Preparation and Optical Properties of New Metal/Macromolecule Architectures

Bernabò, Marco; Ciardelli, Francesco; Pucci, Andrea; Ruggeri, Giacomo

doi:10.1002/masy.200851021

Cited by 10 publications

(6 citation statements)

References 35 publications

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“…Studies have addressed the mechanism by which the small molecules are oriented, , the anisotropic absorption and emission characteristics of the small molecule, and the use of these materials as optical − and photoluminescent polarizers. − In this review, only dichroism, when the absorption or emission varies significantly with respect to the polarization of the light impinging upon it, that reflects on the overall or localized stress/strain of the material will be considered. Mechanically-induced dichroism could, in principle, be used as a stress/strain sensor, but this concept has not been demonstrated. , …”

Section: Responses At the Molecular And Supramolecular Levelsmentioning

confidence: 99%

Mechanically-Induced Chemical Changes in Polymeric Materials

et al. 2009

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Polymeric materials exhibit an extraordinary range of mechanical responses (Figure 1a), which depend on the chemical and physical structure of the polymer chains. 3 Polymers are broadly categorized as thermoplastic, thermoset, or elastomer. Thermoplastic polymers consist of linear or branched chains and can be amorphous or semicrystalline. The mechanical response of thermoplastic polymers is highly influenced by the molecular mass, chain entanglements, chain alignment, and degree of crystallinity. Thermosetting polymers consist of highly cross-linked three-dimensional networks. The mechanical properties of these amorphous polymers depend on the molecular mass and the cross-link density. Elastomers (e.g., rubber) are highly deformable elastic networks that are lightly cross-linked by chemical or physical junctions. Mary M. Caruso (center) was born and raised in Tampa, FL. She received a B.S. degree in Chemistry from Elon University (Elon, NC) in 2006, where she worked under the direction of Prof. Karl D. Sienerth. Her research included the synthesis and electrochemical characterization of a novel palladium complex. She is currently pursuing her Ph.D. in Organic Chemistry at the University of Illinois at Urbana-Champaign under the guidance of Prof. Jeffrey S. Moore and Prof. Scott R. White. Her research interests include the development of new catalyst-free self-healing polymers, microencapsulation, and mechanical testing of bulk polymers. Douglas A. Davis (second from left) was born in Martin, TN. In 2004, he received his B.S. degree in Chemistry from the University of Tennessee, Knoxville, where he worked on surface enhanced Raman spectroscopy (SERS) in an electrospray plume with Professors Charles Feigerle and Kelsey Cook. He joined Prof. Jeffrey Moore's group at the University of Illinois, Urbana-Champaign in 2005 to pursue his Ph.D. in Organic Chemistry. His current research interests include designing and synthesizing mechanophores, which can be induced to undergo chemical reactions with mechanical force. Qilong Shen (third from left) was born in 1974 in Zhejiang Province, China. He received his B.S. degree in Chemistry (1996) from Nanjing University, China, and his M.S. in Chemistry (1999) from Shanghai Institute of Organic Chemistry, the Chinese Science Academy, China, under the supervision of Prof. Long Lu. After a two-year stay at the University of Massachusetts at Dartmouth with Prof. Gerald B. Hammond, he moved to Yale University, where he received his Ph.D. under the guidance of Prof. John F. Hartwig in 2007. He is currently a postdoctoral researcher with Prof. Jeffrey S. Moore at University of Illinois at Urbana-Champaign. His research interests include the discovery, development, and understanding of new transition metal-catalyzed reactions, and the mechanochemistry of polymers.

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Section: Responses At the Molecular And Supramolecular Levelsmentioning

confidence: 99%

Mechanically-Induced Chemical Changes in Polymeric Materials

et al. 2009

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“…Even more interesting is the fact that nanoparticle dispersions in a polymer matrix can be rendered macroscopically anisotropic, a feature that has allowed their use in nonlinear optical devices and linear absorbing polarizers, e.g., for display applications [109,110]. …”

Section: Noble Metal Nanoparticles (Nmnp) Thermoplastic Polymer Sementioning

confidence: 99%

“…When dispersed into polymers as non-aggregated form, nanoparticles with very small diameters (a few nm) allow the design of materials with much reduced light scattering properties, overcoming the widely encountered problem of opacity of heterogeneous composites for optical applications. Even more interesting is the fact that nanoparticle dispersions in a polymer matrix can be rendered macroscopically anisotropic, a feature that has allowed their use in nonlinear optical devices and linear absorbing polarizers, e.g., for display applications [ 109 , 110 ].…”

Section: Noble Metal Nanoparticles (Nmnp) Thermoplastic Polymer Sementioning

confidence: 99%

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Nanocomposites Based on Thermoplastic Polymers and Functional Nanofiller for Sensor Applications

et al. 2015

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Thermoplastic polymers like polyolefins, polyesters, polyamide, and styrene polymers are the most representative commodity plastics thanks to their cost-efficient manufacturing processes, excellent thermomechanical properties and their good environmental compatibility, including easy recycling. In the last few decades much effort has been devoted worldwide to extend the applications of such materials by conferring on them new properties through mixing and blending with different additives. In this latter context, nanocomposites have recently offered new exciting possibilities. This review discusses the successful use of nanostructured dispersed substrates in designing new stimuli-responsive nanocomposites; in particular, it provides an updated description of the synthetic routes to prepare nanostructured systems having the typical properties of thermoplastic polymers (continuous matrix), but showing enhanced optical, conductive, and thermal features dependent on the dispersion topology. The controlled nanodispersion of functional labeled clays, noble metal nanoparticles and carbon nanotubes is here evidenced to play a key role in producing hybrid thermoplastic materials that have been used in the design of devices, such as NLO devices, chemiresistors, temperature and deformation sensors.

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“…Au-PVA films fabricated through such procedures show polarization dependent color changes. 27,41 Polyimide films with in situ generated Pt, Ni and Cu nanoparticles, when subjected to extended annealing, exhibited a decrease of thickness of the composite films resulting in higher nanoparticle densities and reduced interparticle distances. 42 The thinning of the films was attributed to metal-catalyzed decomposition of the polymer surrounding the metal nanoparticles.…”

Section: Control Of Size Shape and Distributionmentioning

confidence: 99%

Polymer thin films embedded with in situ grown metal nanoparticles

2009

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Metal nanoparticle-polymer composites are versatile materials which not only combine the unique characteristics of the components, but also manifest mutualistic effects between the two. Embedding inside polymer thin films facilitates immobilization and organization of the metal nanoparticles and tuning of their electronic and optical responses by the dielectric environment. The embedded metal nanoparticles in turn can impact upon the various material attributes of the polymer matrix. Some of the most convenient and attractive routes to the fabrication of metal nanoparticle-embedded polymer thin films involve in situ generation of the nanoparticles through reduction or decomposition of appropriate precursors inside the solid film. In this tutorial review we present an overview of the different methodologies developed using this general concept and describe the environment-friendly protocol we have optimized for the fabrication of noble metal nanostructures inside polymer thin films, using aqueous media for the synthesis and deploying the polymer itself as the reducing as well as stabilizing agent. A variety of techniques that have been exploited to characterize the precursor to product transformation inside the polymer film are discussed. The unique control provided by the in situ fabrication route on the size, shape and distribution of the nanostructures, and application of the polymer thin films with the in situ generated metal nanoparticles in areas such as nonlinear optics, surface enhanced Raman scattering, e-beam lithography, microwave absorption, non-volatile memory devices and random lasers, illustrate the versatility of these materials. A brief appraisal of the avenues for future developments in this area is presented.

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Preparation and Optical Properties of New Metal/Macromolecule Architectures

Cited by 10 publications

References 35 publications

Mechanically-Induced Chemical Changes in Polymeric Materials

Mechanically-Induced Chemical Changes in Polymeric Materials

Nanocomposites Based on Thermoplastic Polymers and Functional Nanofiller for Sensor Applications

Polymer thin films embedded with in situ grown metal nanoparticles

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