Suryawanshi Sonali B, Mahajan Prasad G, Bodake Anita J, Kolekar Govind B, Patil Shivajirao R
Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University, Kolhapur 416004, Maharashtra, India; Department of Chemistry, Rajaram College, Kolhapur 416004, Maharashtra, India.
Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University, Kolhapur 416004, Maharashtra, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Aug 5;183:232-238. doi: 10.1016/j.saa.2017.04.010. Epub 2017 Apr 18.
A simple carbazole based nanoprobe prepared by reprecipitation method shows selective sensing behavior for Fe ion in aqueous medium. The prepared SDS capped 9-phenyl carbazole nanoparticles (9-PCzNPs) has narrower particle size distribution with an average diameter 35nm and zeta potential of -34.3mV predicted a good stability with negative surface charge over the nanoparticles. The Field Emission Scanning Electron Microscopy (FE-SEM) image showed cubic shape morphology of nanoparticles. The aqueous suspension of SDS capped 9-phenyl carbazole nanoparticles exhibited aggregation induced enhanced red shifted intense emission in comparison with the emission arising from dilute solution of 9-phenyl carbazole in DCM. The cation recognition test based on fluorescence change shows Fe ion induce significant fluorescence quenching, however remaining cations responds negligibly. The obtained quenching data fit into Stern-Volmer relation in the concentration range of 0.0-1.0μg·mL of Fe ion solution and the detection limit is 0.0811μg·mL. The probable mechanism of fluorescence quenching of SDS capped 9-PCzNPs is because of adsorption of Fe ion over the negatively charged surface of NPs through electrostatic interaction. Thus the proposed method was successfully applied for the detection of Fe ion in environmental water sample.
通过再沉淀法制备的一种基于咔唑的简单纳米探针在水性介质中对铁离子表现出选择性传感行为。所制备的十二烷基硫酸钠（SDS）包覆的9-苯基咔唑纳米颗粒（9-PCzNPs）具有更窄的粒径分布，平均直径为35nm，ζ电位为-34.3mV，表明纳米颗粒表面带负电荷，具有良好的稳定性。场发射扫描电子显微镜（FE-SEM）图像显示纳米颗粒呈立方体形貌。与9-苯基咔唑在二氯甲烷中的稀溶液产生的发射相比，SDS包覆的9-苯基咔唑纳米颗粒的水悬浮液表现出聚集诱导增强的红移强发射。基于荧光变化的阳离子识别测试表明，铁离子会引起显著的荧光猝灭，而其余阳离子的响应可忽略不计。在0.0 - 1.0μg·mL的铁离子溶液浓度范围内，获得的猝灭数据符合Stern-Volmer关系，检测限为0.0811μg·mL。SDS包覆的9-PCzNPs荧光猝灭的可能机制是由于铁离子通过静电相互作用吸附在纳米颗粒带负电荷的表面上。因此，该方法成功应用于环境水样中铁离子的检测。
