Armstrong Cameron, Otero Kayla, Hernandez-Pagan Emil A
Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.
Nanoscale. 2024 May 23;16(20):9875-9886. doi: 10.1039/d3nr05035a.
Black metal oxides with varying concentrations of O-vacancies display enhanced optical and catalytic properties. However, direct solution syntheses of this class of materials have been limited despite being highly advantageous given the different synthetic handles that can be leveraged towards control of the targeted material. Herein, we present an alternate colloidal synthesis of black InO nanoparticles from the simple reaction between In(acac) and oleyl alcohol. Growth studies by PXRD, TEM, and STEM-EDS coupled to mechanistic insights from H, C NMR revealed the particles form two paths, one of which involves In. We also show that variations in the synthesis atmosphere, ligand environment, and indium precursor can inhibit formation of the black InO. The optical spectrum for the black nanoparticles displayed a significant redshift when compared to pristine InO, consistent with the presence of O-vacancies. Raman spectra and surface analysis also supported the presence of surface oxygen vacancies in the as-synthesized black InO.
具有不同浓度氧空位的黑色金属氧化物表现出增强的光学和催化性能。然而，尽管这类材料的直接溶液合成具有很大优势，因为可以利用不同的合成手段来控制目标材料，但此类合成方法一直受到限制。在此，我们通过In(acac)与油醇之间的简单反应，提出了一种黑色InO纳米颗粒的替代胶体合成方法。通过PXRD、TEM和STEM-EDS进行的生长研究，以及结合H、C NMR的机理见解表明，颗粒形成有两条路径，其中一条涉及In。我们还表明，合成气氛、配体环境和铟前驱体的变化会抑制黑色InO的形成。与原始InO相比，黑色纳米颗粒的光谱显示出明显的红移，这与氧空位的存在一致。拉曼光谱和表面分析也支持了合成的黑色InO中存在表面氧空位。
