Tailoring the morphological and optical properties of monodisperse silica

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-11-01 DOI:10.1007/s10971-024-06604-5

Anjali Saini, Harshvardhan Negi, Sanjay K. Srivastava, Prathap Pathi, Rimjhim Yadav, Mrinal Dutta

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Abstract

Monodisperse silica of sizes from 0.67 µm to 3.2 µm was synthesized by a low-cost semi-batch technique free from the use of any stabilizer, porogen or surfactant. The effect of precursor (tetraethyl orthosilicate), hydrolyzing agent and catalyst concentration variation on the size, morphology, size distribution and optical properties of silica particles was studied. TEM observation and N₂ adsorption-desorption studies showed the existence of a thin porous shell layer covering the outer surface of these particles. Absorption in the UV-Vis range confirmed that E’ and oxygen-deficiency centers (ODCs) prevailed. The observed broad photoluminescence including the UV, blue, green and red regions of the spectrum were attributed to the presence of ODCs, self-trapped excitons, hydrogen-related defects and non-bridging-oxygen hole centers respectively. A two-photon guided relaxation of free exciton was found to be a prominent cause of observed luminescence.

Graphical Abstract

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调整单分散二氧化硅的形态和光学性质

采用低成本半批工艺合成了粒径为0.67µm ~ 3.2µm的单分散二氧化硅，不使用任何稳定剂、破孔剂或表面活性剂。研究了前驱体（正硅酸四乙酯）、水解剂和催化剂浓度的变化对二氧化硅颗粒尺寸、形貌、尺寸分布和光学性质的影响。TEM观察和N2吸附-解吸研究表明，这些颗粒的外表面存在一层薄薄的多孔壳层。紫外-可见光谱范围内的吸收证实了E′和缺氧中心（ODCs）的存在。在紫外区、蓝区、绿区和红区观察到的广谱光致发光分别是由于ODCs、自捕获激子、氢相关缺陷和非桥接氧空穴中心的存在。发现双光子引导的自由激子弛豫是观测到发光的主要原因。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.