钼钨蓝纳米颗粒作为超细二元碳化物的前驱体

Molybdenum-Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides.

作者信息

Myachina Maria, Gavrilova Natalia, Poluboyarinova Ksenia, Nazarov Victor

机构信息

Department of Colloid Chemistry, D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047 Moscow, Russia.

出版信息

Nanomaterials (Basel). 2021 Mar 17;11(3):761. doi: 10.3390/nano11030761.

DOI:10.3390/nano11030761

PMID:33803054

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8002895/

Abstract

Herein, we demonstrate a promising method for the synthesis of ultrafine carbide particles using dispersions of molybdenum-tungsten nanoparticles. Dispersions of molybdenum-tungsten blue nanoparticles with different initial molar ratios of molybdenum/tungsten were synthesized through the reduction of molybdate and tungstate ions by ascorbic acid in an acidic medium (pH = 1.0-2.5). Molybdenum-tungsten blue nanoparticles were characterized by ultraviolet-visual (UV-VIS), infrared (FTIR), and X-ray photoelectron (XPS) spectroscopies; transmission electronic microscopy (TEM); and dynamic light scattering (DLS). We demonstrated that molybdenum-tungsten blue nanoparticles belong to toroidal polyoxometalate clusters (λ = 680-750 nm) with a predominant particle size of 4.0 nm. Molybdenum-tungsten blue dispersions were shown to be monodispersed systems with a small particle size and long-term stability (>30 days) and are suitable for further catalytic applications.

摘要

在此，我们展示了一种利用钼钨纳米颗粒分散体合成超细碳化物颗粒的有前景的方法。通过在酸性介质（pH = 1.0 - 2.5）中用抗坏血酸还原钼酸根离子和钨酸根离子，合成了具有不同钼/钨初始摩尔比的钼钨蓝纳米颗粒分散体。采用紫外可见（UV - VIS）光谱、红外（FTIR）光谱、X射线光电子能谱（XPS）、透射电子显微镜（TEM）和动态光散射（DLS）对钼钨蓝纳米颗粒进行了表征。我们证明钼钨蓝纳米颗粒属于环形多金属氧酸盐簇（λ = 680 - 750 nm），主要粒径为4.0 nm。钼钨蓝分散体被证明是具有小粒径和长期稳定性（>30天）的单分散体系，适用于进一步的催化应用。