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Issue 3, 2003
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High refractive index thin films of ZnS/polythiourethane nanocomposites

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Abstract

High refractive index optical thin films of nano-ZnS/polythiourethane (PTU) composites have been prepared via immobilization of thiophenol (PhSH)/mercaptoethanol (ME)-capped ZnS nanoparticles into a PTU matrix. PhSH/ME-capped ZnS particles with a diameter of 2–6 nm were synthesized by reacting zinc acetate with H2S in N,N-dimethylformamide. The nanocomposite films with high refractive index were prepared by adding an isocyanate group terminated PTU oligomer, which was synthesized by polyaddition of 2,2′-dimercaptoethylsulfide (MES) and isophorone diisocyanate (IPDI), to a DMF solution containing colloidal ZnS particles, and followed by spin-coating and multi-step heat curing. FTIR studies show that the ZnS nanoparticles were successfully immobilized into the polymer matrix. TGA results indicates that the nanocomposite films have a good thermal stability and the weight fraction of ZnS particles in the films is well in accordance with that of theoretical calculations. TEM studies suggest that the ZnS nanoparticles with a diameter of 2–6 nm were well dispersed in the PTU matrix and maintained their original size before immobilization. The refractive index of the transparent ZnS/PTU nanocomposite films was in the range from 1.574 to 1.848 at 632.8 nm, which linearly increased with the content of PhSH/ME-capped ZnS from 0 to 97 wt%.

Graphical abstract: High refractive index thin films of ZnS/polythiourethane nanocomposites

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Publication details

The article was received on 11 Sep 2002, accepted on 13 Jan 2003 and first published on 04 Feb 2003


Article type: Paper
DOI: 10.1039/B208850A
Citation: J. Mater. Chem., 2003,13, 526-530
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    High refractive index thin films of ZnS/polythiourethane nanocomposites

    C. Lü, Z. Cui, Z. Li, B. Yang and J. Shen, J. Mater. Chem., 2003, 13, 526
    DOI: 10.1039/B208850A

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