“…The absorption peak positioned at 758 cm –1 is related to the C–C ring vibration and the one at 934 cm –1 is for the C–C ring breathing [45]. The peaks appear at 1233 and 1370 cm –1 due to the C–C back bone and CH deformation, respectively [45,46]. The peak observed at 1665 cm –1 is related to C=O, while the band at 1494 cm –1 is ascribed to the CH 2 scissors vibration [45].…”
Willemite is a wide band gap semiconductor used in modern day technology for optoelectronics application. In this study, a new simple technique with less energy consumption is proposed. Willemite nanoparticles (NPs) were produced via a water–based solution consisting of a metallic precursor, polyvinylpyrrolidone (PVP), and underwent a calcination process at 900 °C for several holding times between 1–4 h. The FT–IR and Raman spectra indicated the presence of metal oxide bands as well as the effective removal of PVP. The degree of the crystallization and formation of the NPs were determined by XRD. The mean crystallite size of the NPs was between 18.23–27.40 nm. The morphology, particle shape and size distribution were viewed with HR-TEM and FESEM analysis. The willemite NPs aggregate from the smaller to larger particles with an increase in calcination holding time from 1–4 h with the sizes ranging between 19.74–29.71 nm. The energy values obtained from the experimental band gap decreased with increasing the holding time over the range of 5.39 eV at 1 h to at 5.27 at 4 h. These values match well with band gap obtained from the Mott and Davis model for direct transition. The findings in this study are very promising and can justify the use of these novel materials as a potential candidate for green luminescent optoelectronic applications.
“…The absorption peak positioned at 758 cm –1 is related to the C–C ring vibration and the one at 934 cm –1 is for the C–C ring breathing [45]. The peaks appear at 1233 and 1370 cm –1 due to the C–C back bone and CH deformation, respectively [45,46]. The peak observed at 1665 cm –1 is related to C=O, while the band at 1494 cm –1 is ascribed to the CH 2 scissors vibration [45].…”
Willemite is a wide band gap semiconductor used in modern day technology for optoelectronics application. In this study, a new simple technique with less energy consumption is proposed. Willemite nanoparticles (NPs) were produced via a water–based solution consisting of a metallic precursor, polyvinylpyrrolidone (PVP), and underwent a calcination process at 900 °C for several holding times between 1–4 h. The FT–IR and Raman spectra indicated the presence of metal oxide bands as well as the effective removal of PVP. The degree of the crystallization and formation of the NPs were determined by XRD. The mean crystallite size of the NPs was between 18.23–27.40 nm. The morphology, particle shape and size distribution were viewed with HR-TEM and FESEM analysis. The willemite NPs aggregate from the smaller to larger particles with an increase in calcination holding time from 1–4 h with the sizes ranging between 19.74–29.71 nm. The energy values obtained from the experimental band gap decreased with increasing the holding time over the range of 5.39 eV at 1 h to at 5.27 at 4 h. These values match well with band gap obtained from the Mott and Davis model for direct transition. The findings in this study are very promising and can justify the use of these novel materials as a potential candidate for green luminescent optoelectronic applications.
“…Two absorption bands of medium intensity in the region 2850–2940 cm −1 are characteristic of symmetric and asymmetric stretching vibrations of C-H bonds. In addition, the DRIFT spectrum of the sample with amino/methyl groups (AM, not presented here) has sharp absorption band at 1273 cm −1 , which is absent in the DRIFT spectra of other samples and can be attributed to δ s (CH 3 ) of methyl group bond to a silicon atom [16]. Fig.…”
In order to obtain amino-functionalized silica materials with magnetic core, one-step synthesis was carried out. Several materials, differ in number and structure of amino groups, were synthesized on the basis of sol-gel method. The synthesized materials were examined by several analytical techniques. The presence and content of amino groups were measured by using Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy and acid-base titration, respectively. Specific surface areas were measured by nitrogen/adsorption desorption isotherms. It was proved that sol-gel approach leads to obtain materials with high content of amino groups built into their surfaces (in the range 1.6–2.7 mmol/g). As-obtained materials were tested as potential adsorbents for copper(II) ions. The received maximum adsorption capacities were in the range 0.4–0.7 mmol/g.
“…31͒ and other functional groups similar to the ones present in PAH-Os, e.g., pyridines, bipyridines, polystyrenes, disubstituted benzenes, and polyethenes. 33 We find that some of the new signals appearing in spectra 2, 3, and 7-9 ͑ϳ710, ϳ1080, ϳ1295, and ϳ1410 cm −1 ͒ can be identified with the polymer backbone vibrations. Spectra 4-6 merit special consideration because of their similar behavior.…”
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