Effect of thermal treatment on the surface/interfacial behaviour of Au@SiO2 nanoparticles in the presence of CTAB surfactant molecules
Autor: | Susheel Kumar Gundanna, Arijit Mitra, Lakshminarayana Kudinalli Gopalakrishna Bhatta, Umananda M. Bhatta |
---|---|
Rok vydání: | 2021 |
Předmět: |
Thermogravimetric analysis
Materials science Absorption spectroscopy Economies of agglomeration General Chemical Engineering Nanoparticle 02 engineering and technology Thermal treatment 021001 nanoscience & nanotechnology 020401 chemical engineering Chemical engineering Colloidal gold 0204 chemical engineering Absorption (chemistry) Fourier transform infrared spectroscopy 0210 nano-technology |
Zdroj: | Powder Technology. 381:503-508 |
ISSN: | 0032-5910 |
Popis: | The organic surfactants like CTAB have long been used in numerous methods of chemical synthesis of nanoparticles effectively, in order to avoid agglomeration and provide stability. However, these are not really stable at higher temperatures. Hence, in this work, gold nanoparticles have been encapsulated with SiO2 shells along with CTAB surfactant molecules. The thermal behaviour and the associated physicochemical changes in the Au@SiO2 core-shell structures, during the Thermo Gravimetric Analysis (TGA), have been studied using several standard characterization techniques like Fourier Transform Infrared Spectroscopy, Transmission Electron Microscopy, X-ray Diffractometry and UV–Vis Absorption spectroscopy. About 40% weight loss has been observed during the TGA treatment. The TEM results show different stages of agglomeration after TGA, which includes expansion of SiO2 shells, out-diffusion of gold particles and their eventual agglomeration. Detailed FTIR analysis confirms the proposed mechanism, and is well complemented by TEM, XRD and UV–Vis Absorption results. |
Databáze: | OpenAIRE |
Externí odkaz: |