Ansari Zarina, Singha Shib Shankar, Saha Abhijit, Sen Kamalika
Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700009, India.
Department of Physics, Brahmananda Keshab Chandra College, 111/2 B. T. Road, Bon Hooghly, Kolkata 700 108, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Apr 5;176:67-78. doi: 10.1016/j.saa.2017.01.005. Epub 2017 Jan 4.
A simple room temperature synthesis method of Ni, Cu and Zn sulfide nanoparticles (NPs) in aqueous medium is reported here. The NPs stabilized in aqueous medium by the citrate ions were characterized by UV-vis, ζ potentials, TEM and Raman spectroscopic techniques. The solid NPs could be isolated from the aqueous medium when allowed to stand for a prolonged time (~20h). The solids were also characterized by IR and powder X-ray analysis. The nanoparticles were further used for the development of facile optical sensing and detection of heavy metal ions at trace scale. Alterations in the absorption spectra of the generated NPs were indicative of their interactions with heavy metal ions. Raman spectral measurements further validate the detection technique. It is found that out of the three synthesized nanoparticles, nickel sulfide NP is a specific sensor for mercury ions whereas zinc sulfide and copper sulfide NPs act as sensors for Hg, Cd and Pb.
本文报道了一种在水介质中室温合成镍、铜和锌硫化物纳米颗粒（NPs）的简单方法。通过紫外可见光谱、ζ电位、透射电子显微镜（TEM）和拉曼光谱技术对由柠檬酸根离子稳定在水介质中的纳米颗粒进行了表征。当让其长时间静置（约20小时）时，固体纳米颗粒可从水介质中分离出来。还通过红外光谱和粉末X射线分析对固体进行了表征。这些纳米颗粒进一步用于开发简便的光学传感和痕量重金属离子检测。所生成纳米颗粒吸收光谱的变化表明它们与重金属离子的相互作用。拉曼光谱测量进一步验证了该检测技术。结果发现，在三种合成的纳米颗粒中，硫化镍纳米颗粒是汞离子的特异性传感器，而硫化锌和硫化铜纳米颗粒则作为汞、镉和铅的传感器。
