Sharma Vikash, Chotia Chanderbhan, Ganesan Vedachalaiyer, Okram Gunadhor S
UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, MP, India.
Phys Chem Chem Phys. 2017 May 31;19(21):14096-14106. doi: 10.1039/c7cp01769c.
Nickel nanoparticles (NPs) are promising candidates for various applications, including biomedical ones, as they have good magnetic properties as well as high thermal conductivity. We used well-characterized Ni NPs of average Scherrer sizes from 1.31 nm to 22.23 nm and investigated the effects of the primary particle size, size distribution and dielectric environments, and of separately adding non-ionic polyvinylpyrrolidone (PVP), cationic cetyltrimethylammonium bromide (CTAB) and anionic ethylenediaminetetraacetic acid (EDTA) in ethanol, on their stability and agglomeration behaviour using atomic force microscopy (AFM), particle size analysis and zeta potential study through dynamic light scattering (DLS) combined with UV-visible spectroscopy data. The dominant influence of surfactants, additives, particles size and shape on the surface plasmon resonance (SPR) was found. SPR is considerably sensitive to the dielectric environment in addition to size and shape. Moreover, increasing the concentration of PVP led to an enhanced SPR intensity and a shift in its position towards higher wavelength. 1.31 nm NPs with EDTA as an additive yielded the best dispersibility and also showed superparamagnetic behaviour at 300 K, indicating their favourable application potentials.
镍纳米颗粒（NPs）因其具有良好的磁性以及高导热性，在包括生物医学应用在内的各种应用中都是很有前景的候选材料。我们使用了平均谢乐尺寸在1.31纳米至22.23纳米之间且特性良好的镍纳米颗粒，通过原子力显微镜（AFM）、粒度分析以及结合紫外可见光谱数据的动态光散射（DLS）进行的zeta电位研究，来探究初级粒径、粒径分布和介电环境，以及在乙醇中分别添加非离子型聚乙烯吡咯烷酮（PVP）、阳离子型十六烷基三甲基溴化铵（CTAB）和阴离子型乙二胺四乙酸（EDTA）对其稳定性和团聚行为的影响。研究发现了表面活性剂、添加剂、颗粒尺寸和形状对表面等离子体共振（SPR）的主要影响。除了尺寸和形状外，SPR对介电环境相当敏感。此外，增加PVP的浓度会导致SPR强度增强且其位置向更高波长移动。以EDTA作为添加剂的1.31纳米纳米颗粒具有最佳的分散性，并且在300 K时还表现出超顺磁性行为，表明它们具有良好的应用潜力。
