García Beatriz O, Kharissova Oxana V, Dias Rasika, Aguirre-Tostado Francisco S, Leyva César, González Lucy T, Kharisov Boris I
Department of Chemical Sciences, Universidad Autonoma de Nuevo Leon, Monterrey, Mexico.
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States.
Recent Pat Nanotechnol. 2019;13(1):59-69. doi: 10.2174/1872210513666190225095537.
Synthesis and applications of Ag-coated carbon nanotubes are currently under intensive research, resulting in a series of recent patents. Silver nanoparticles are normally obtained from silver nitrate. However, there are also other silver-containing compounds that can facilitate the production of silver nanoparticles, such as silver(I) acetate and silver(II) oxide. Being combined with carbon nanotubes, silver nanoparticles can transfer to them some of their useful properties, such as conductivity and antibacterial properties, and contribute to improving their dispersion in solvents.
To apply three different silver-containing precursors of Ag nanoparticles for the decoration of carbon nanotubes and study the morphology of formed composites by several methods.
Three different silver compounds were used as Ag source to carry out the functionalization and decoration of carbon nanotubes under ultrasonic treatment of the reaction system, containing, commercial carbon nanotubes, organic peroxides as oxidants or hydrazine as a reductant, and a surfactant. Resulting samples were analyzed by XRD and XPS spectroscopy, as well as TEM and SEM microscopy to study the morphology of formed nanocomposites.
Silver nanoparticles can be produced without the presence of a reducing agent. Applying hydrazine, as a reducing agent, it is possible to obtain functionalized carbon nanotubes doped with silver nanoparticles, in which their sizes are smaller (1-5 nm) compared to those obtained without using hydrazine.
Silver nanoparticles having a size range between 2-60 nm can be produced without the presence of a reducing agent. The use of a reducing agent, such as hydrazine, affects the size of silver nanoparticles.
目前，银包覆碳纳米管的合成与应用正在深入研究中，由此产生了一系列近期专利。银纳米颗粒通常由硝酸银制得。然而，也有其他含银化合物可促进银纳米颗粒的制备，如醋酸银（I）和氧化银（II）。与碳纳米管结合后，银纳米颗粒可将其一些有用特性，如导电性和抗菌性传递给碳纳米管，并有助于改善它们在溶剂中的分散性。
应用三种不同的银纳米颗粒含银前驱体对碳纳米管进行修饰，并通过多种方法研究形成的复合材料的形态。
使用三种不同的银化合物作为银源，在含有商业碳纳米管、作为氧化剂的有机过氧化物或作为还原剂的肼以及一种表面活性剂的反应体系超声处理下，对碳纳米管进行功能化和修饰。通过X射线衍射（XRD）和X射线光电子能谱（XPS）以及透射电子显微镜（TEM）和扫描电子显微镜（SEM）对所得样品进行分析，以研究形成的纳米复合材料的形态。
在没有还原剂存在的情况下也可以制备银纳米颗粒。使用肼作为还原剂，可以获得掺杂有银纳米颗粒的功能化碳纳米管，与不使用肼获得的相比，其尺寸更小（1 - 5纳米）。
在没有还原剂存在的情况下，可以制备尺寸范围在2 - 60纳米之间的银纳米颗粒。使用还原剂，如肼，会影响银纳米颗粒的尺寸。
