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Near-infrared Absorbance Properties of Cu2-xS/SiO2 Nanoparticles and Their PDMS-based Composites

Abstract

We synthesized different Cu2-xS nanoparticles (CuS and Cu1.8S NPs) with localized surface plasmon resonance (LSPR) absorbance in the near infrared (NIR) and applied a silica layer on the surface of Cu2-xS nanoparticles (NPs) to achieve high photo- and dispersion stability. These plasmonic Cu2-xS NPs have been much utilized as a thermal shielding materials of energy-saving windows, which can block the ultraviolet (UV) and NIR regions and transmit the visible (Vis) region; however, this application is limited because Cu2-xS NPs have photocatalyst properties that lead to the decomposition of organic matter, and dispersing these NPs into polymer films is difficult. Herein, the silica coating was successfully suppressed the generation of hydroxyl radicals in the surface of CuS NPs, which cause the photo-degradation of polydimethylsiloxane (PDMS) polymer. Furthermore, the silica layer with the structure similar to PDMS provided the dispersion stability of CuS NPs. The achievement of good photo- and dispersion stability in the Cu2-xS NPs was demonstrated by the thermal shielding effect using a simulated experiment. The temperature change of a box shielded with a CuS/SiO2 - PDMS film (∆T = 6.8 oC) was smaller than it was when the box was shielded with common glass (∆T = 12.7 oC) or a CuS - PDMS film (∆T = 9.2 oC). This research introduces a new and reliable thermal shielding material.

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Publication details

The article was received on 20 Oct 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04784C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Near-infrared Absorbance Properties of Cu2-xS/SiO2 Nanoparticles and Their PDMS-based Composites

    Y. Kwon, G. Lim, S. Kim, S. H. Ryu, T. Hwang, K. Park and C. Yong-Ho, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04784C

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