Borowska Magdalena, Jankowski Krzysztof, Trzaskowski Maciej, Wojtasiak Wojciech, Korpas Przemysław, Kozłowski Sebastian, Gryglewski Daniel
Faculty of Chemistry, Chair of Analytical Chemistry, Warsaw University of Technology, Warsaw, Poland.
Centre for Advanced Materials and Technologies CEZAMAT, Warsaw University of Technology, Warsaw, Poland.
Sci Rep. 2024 Dec 28;14(1):31444. doi: 10.1038/s41598-024-83124-w.
The effects of 5.8-GHz microwave (MW) irradiation on the synthesis of mesoporous selenium nanoparticles (mSeNPs) in aqueous medium by reduction of selenite ions with ascorbic acid, using zinc nanoparticles as a hard template and cetyltrimethylammonium bromide (CTAB) as a micellar template, are examined for the first time with a particular emphasis on MW-particle interactions and the NPs morphology. This MW-assisted synthesis is compared to 2.45 GHz MW heating method and conventional hydrothermal method at around 100 °C to produce the nanoparticles of different morphology and particle size distributions. The NPs morphology is tailored by varying the temperature ramp characteristics and the MW irradiation time. Under mild synthesis conditions only spherical particles are formed. Enhancing temperature ramp rate in the presence of CTAB micelles increases the metal-semiconductor hybrid particles growth rate and promotes the formation of nanorods and branched shapes. The effect is MW frequency dependent and non-thermal to some extent. Multi-step mechanism of mSeNPs formation is proposed based on derivative UV-Vis spectrophotometry and scanning electron microscopy (SEM) data. Both the stability of the chemical composition at a single particle level and the high efficiency of zinc template removal are determined by single particle microwave plasma optical emission spectrometry (SP-MWP-OES). After Zn template removal mSeNPs can be loaded with antifungal carbamate agent, hence the application as a nanopesticide is suggested.
首次研究了5.8吉赫兹微波（MW）辐射对在水介质中以锌纳米颗粒为硬模板、十六烷基三甲基溴化铵（CTAB）为胶束模板，通过抗坏血酸还原亚硒酸根离子合成介孔硒纳米颗粒（mSeNPs）的影响，特别强调了微波与颗粒的相互作用以及纳米颗粒的形态。将这种微波辅助合成方法与2.45吉赫兹微波加热方法以及约100℃的传统水热方法进行比较，以制备具有不同形态和粒径分布的纳米颗粒。通过改变升温特性和微波辐射时间来调整纳米颗粒的形态。在温和的合成条件下，仅形成球形颗粒。在CTAB胶束存在下提高升温速率会增加金属 - 半导体混合颗粒的生长速率，并促进纳米棒和分支形状的形成。这种效应在一定程度上依赖于微波频率且是非热效应。基于导数紫外 - 可见分光光度法和扫描电子显微镜（SEM）数据，提出了mSeNPs形成的多步机制。通过单颗粒微波等离子体光发射光谱法（SP - MWP - OES）确定了单颗粒水平上化学成分的稳定性以及锌模板去除的高效率。去除锌模板后，mSeNPs可负载抗真菌氨基甲酸酯剂，因此建议将其用作纳米农药。
