Innovative surfactant-free synthesis of core-shell SiO 2 /ZnO particles: rapid ultrasonication and photocatalytic inhibition.

Autor: Qomariyah L; Department of Industrial Chemical Engineering, Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia laila.qomariyah@its.ac.id., Hirano T; Chemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University 1-4-1 Kagamiyama Higashihiroshima Hiroshima 739-8527 Japan., Putra NR; Research Center for Pharmaceutical Ingredients and Traditional Medicine, National Research and Innovation Agency (BRIN), Complex Cibinong Science Center-BRIN Cibinong 16911 Jawa Barat Indonesia., Suprapto S; Department of Industrial Chemical Engineering, Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia laila.qomariyah@its.ac.id., Ajiz HA; Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia., Fauziyah M; Department of Chemical Engineering, Faculty of Engineering, Universitas Brawijaya Malang 65145 Indonesia.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 Apr 19; Vol. 14 (18), pp. 12665-12675. Date of Electronic Publication: 2024 Apr 19 (Print Publication: 2024).
DOI: 10.1039/d4ra01309c
Abstrakt: This study demonstrates the preparation of SiO 2 /ZnO core-shell nanoparticles with controllable shell size and their optical properties. A facile ultrasonication method was utilized to prepare the core-shell particles in the absence of surfactant materials. The synthesis duration was 75% shorter than that required for the common sol-gel method, which favours its potential applicability in the future for mass production. Tetraethyl orthosilicate (TEOS) was used as the silica source, while the core material was prepared using zinc acetate dihydrate. The outer shell size could easily be controlled by changing the molar ratio of silica from 0.25 to 1.00. The experimental results show that increasing the silica ratio was effective in suppressing the self-agglomeration of ZnO and, further, in obtaining agglomeration-free particles. The investigation of the photoluminescence (PL) properties of nanometre-sized ZnO revealed several emission peaks in the ultraviolet (UV) wavelength range, indicating variations in bandgap energy. This did not appear in the spectrum of micrometre-sized ZnO particles. The core-shell particles produced with higher amounts of silica showed higher UV-A and UV-B absorption. In addition, the presence of silica reduced the photocatalytic activity of ZnO by 65% and reduced the PL intensity. The obtained emission peaks, intensity changes, and spectral characteristics open new avenues for further research on tailoring the properties of SiO 2 /ZnO core-shell structures for specific technological advancements. These advancements hold promising applications in UV attenuation materials, LED technologies, lenses, and solar cells within the realm of optical devices.
Competing Interests: The authors declare that they have no conflict of interest such as financial or personal relationship that influence the work reported in this paper.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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