Ag/epoxy nanocomposite film with aligned Ag nanowires and their polarization property
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The metal nanoparticles dispersed in matrices of composite material are able to apply in different technologies based on their peculiarity. This article reports the preparation of Ag/epoxy nanocomposite film with aligned Ag nanowires coated on glass substrate by multistep processing including synthesis of Ag nanowires by seed-mediated method, dispersion of Ag nanowires in the epoxy resin, and stretching to form the Ag/epoxy nanocomposite film. The results showed that Ag nanowires had been well aligned in the direction of stretching, both in the surface layer and in the internal of the film. Meanwhile, the Ag/epoxy nanocomposite film showed an obviously infrared polarization property in a broad wavelength range from 1600 to 2600 nm, with transmittance over 70%. The mechanisms for the orientation of Ag nanowires and the generation of polarization property of the films were discussed, respectively. I. INTRODUCTION
Light polarization technique is a new branch of modern optical technology, which is widely applied in detecting and optoelectronic field including fiber-optic communication, optical disk memory, optical modulation, and optical sensor. With the rapid development of photoelectric integration technology, the preparation of polarizing component with large size and thin film structure become the focal point of research now. Many preparation methods have been developed to fabricate the micropolarizer by technique of physical sputtering, molecular beam epitaxy, electron beam etching, and so on.1–3 However, the traditional preparation techniques above are rather complicated with adoption of expensive equipment, whereas the size of polarizer is small, which cannot meet the needs of application in integrated optoelectronics field. In 1989, metal nanowire arrays formed in alumina film have been reported to yield a polarizing effect in near infrared (IR) wavelength theoretically and experimentally.4 Thus a new way was pioneered for the preparation of micropolarizer with adoption of nanotechnology, though the film is too fragile to obtain actual application. In fact, the noble metal nanoparticles have received enormous attention due to their unique optical, electronic, chemical, and thermal properties.5–7 Especially the surface plasmon resonances excited by an incident photon beam have a vast number of potential applications such as optical computers, optical switches,8,9 and biosensors.10
Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2011.254 J. Mater. Res., Vol. 26, No. 21, Nov 14, 2011
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Furthermore, the optical properties of the noble metal nanoparticles can be tuned by the fine control of several particles’ parameters, including size, shape, aggregation state, and the nature of the surroundings.11 To utilize the special properties of noble metal nanoparticles, it is essential to realize the preparation of special shape nanoparticles and to assemble the nanoparticles with bulk phase in various forms. Ti
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