Abstract
New flexible and transparent materials based on germanium sulfide were obtained using GeCl4 and 1,3-propanedithiol as precursors. These materials have transparency in the ultraviolet-visible (UV-Vis) spectral region (about 70%), thermal stability up to 200 °C and glass transition located at temperatures below 0 °C (-37 °C, -56 °C and -59 °C) as shown by differential scanning calorimetry (DSC) curves. Scanning electron microscopy (SEM) images showed that the polymer is homogeneous and presents formation of crystals in some regions of the surface. These polymers also exhibit Ge-S bonds in its structure, as can be observed through Fourier transform infrared (FTIR) (bands at 399, 401, 432 and 470 cm-1) and Raman (peaks at 361 and 430 cm-1) spectroscopies, and the diffraction patterns X-rays, which suggest the formation of a mixture of GeS2 and GeO2phases (also confirmed through energy-dispersive X-ray analysis). The coupled thermogravimetric analysis / Fourier transform infrared (TG/FTIR) technique was used to investigate the degradation of the sample. Taken together, the results of these characterizations suggest optical applications, and usability at low temperatures.
Highlights
Chalcogenide glasses are materials in which sulfur, selenium, or tellurium form one of the basic constituents.[1]
The observed frequency bands are characteristic of alpha-quartz like GeO2: 121, 164, 210, 261, 327, 514 and 592 cm-1.28 The 164 cm-1 is present at Raman spectrum of Geprop samples (Figure 9a-c), which suggests the presence of Ge-O bonds in these polymers
Germanium sulfide polymers were successfully solution-based prepared. The characterization of these polymeric germanium sulfide materials was presented and spectroscopic measurements confirmed the formation of Ge-S bonds
Summary
Chalcogenide glasses are materials in which sulfur, selenium, or tellurium form one of the basic constituents.[1].
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