Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 392, Issue 1, Pages 171-177Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2011.09.051
Keywords
Cold; Titanium oxide; Nanoparticles; Optical limiting properties; UV-vis; TEM; Fluorescence
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A novel approach to synthesize Au/TiO2 nanostructures with interesting optical properties is presented and discussed. It is based on the nanoparticle cold or hot nanosoldering occurring when two water suspensions of Au and TiO2 nanoparticles are merely mixed at room temperature or laser irradiated after mixing. Thanks to the high fraction and mutual reactivity of surface species, immediately after the mixing process, the encounters between Au and TiO2 nanoparticles in liquid phase are enough for cold nanosoldering of gold nanoparticles onto TiO2 nanoparticles to occur. The optical characterizations show that this fast process (timescale less than 1 min) is followed by a slower process, attributable to some change of the Au nanoparticles. This latter process is significantly accelerated by the 532 nm laser light illumination. The structural and optical properties of cold and hot nanosoldered Au-TiO2 nanoparticles were investigated by TEM, UV-vis and fluorescence spectroscopies. Interesting optical limiting response was detected at laser fluences above 0.8 J/cm(2). The nature of the nonlinear effect was investigated by the Z-scan technique, determining both the nonlinear absorption coefficient and the refraction index. Such interesting non-linear optical properties are worth to be tailored for specific applications. (C) 2011 Elsevier B.V. All rights reserved.
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