Multi-photon in situ synthesis and patterning of polymer-embedded nanocrystals

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JOURNAL OF MATERIALS CHEMISTRY, 22(19), 9787-9793. THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND: ROYAL SOC CHEMISTRY (2012) .

ROYAL SOC CHEMISTRY

Abstract

The in situ synthesis and patterning of CdS nanocrystals in a polymer matrix is performed via multiphoton absorption. Quantum-sized CdS nanocrystals are obtained by irradiating a cadmium thiolate precursor dispersed in a transparent polymer matrix with a focused near infrared femtosecond laser beam. High resolution transmission electron microscopy evidences the formation of nanocrystals with wurtzite crystalline phase. Fluorescent, nanocomposite patterns with sub-micron spatial resolution are fabricated by scanning the laser beam on the polymer-precursor composite. Moreover, the emission energy of the CdS nanocrystals can be tuned in the range 2.5-2.7 eV, by changing the laser fluences in the range 0.10-0.45 J cm(-2). This method enables therefore the synthesis of luminescent, CdS-based composites to be used within patterned nanophotonic and light-emitting devices.



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