Bharathi D, Krishna R Hari, Siddlingeshwar B, Divakar Darshan Devang, Alkheraif Abdulaziz Abdullah
Department of Physics, M. S. Ramaiah Institute of Technology, Bengaluru, 560054, Karnataka, India.
Department of Chemistry, M. S. Ramaiah Institute of Technology, Bengaluru, 560054, Karnataka, India.
J Hazard Mater. 2019 May 5;369:17-24. doi: 10.1016/j.jhazmat.2019.02.008. Epub 2019 Feb 4.
In spite copper oxide being one of the essential micronutrient, copper oxide in its nano size is found to be toxic in nature; this instigates for the detection of copper oxides in trace levels. In the present study, we demonstrate simple cost effective detection method for CuO/CuO using carbon quantum dots (CQD) by fluorescence quenching technique. CuO/CuO nanoparticles are synthesised by mere variation of fuel ratio by solution combustion technique. The resulting oxides are characterized by various analytical and spectroscopic techniques. Powder X- ray diffraction (PXRD) results reveals that samples prepared with oxidizer to fuel (O/F) ratios 1:1, 1:1.5 and 1:2 showed pure nano CuO, major CuO phase (minor CuO) and major CuO phase (minor CuO) respectively. Further, the samples prepared using 1:1 O/F ratio and calcinated at 700 °C showed highly crystalline CuO phase. In order to study the interaction of CuO/ CuO with CQDs the fluorescence quenching method has been employed. The bimolecular quenching rate constants for the samples prepared with different O/F ratios have been measured. The interaction between CQDs and copper oxides, indicates fluorescence quenching greatly depends on the oxidation state of the copper oxide and can be a promising method for detecting CuO/CuO through CQDs.
尽管氧化铜是必需的微量营养素之一，但纳米尺寸的氧化铜被发现具有毒性；这促使人们对痕量水平的氧化铜进行检测。在本研究中，我们展示了一种使用碳量子点（CQD）通过荧光猝灭技术检测CuO/CuO的简单且经济高效的方法。通过溶液燃烧技术仅改变燃料比来合成CuO/CuO纳米颗粒。所得氧化物通过各种分析和光谱技术进行表征。粉末X射线衍射（PXRD）结果表明，以氧化剂与燃料（O/F）比1:1、1:1.5和1:2制备的样品分别显示出纯纳米CuO、主要CuO相（次要CuO）和主要CuO相（次要CuO）。此外，使用1:1 O/F比制备并在700°C煅烧的样品显示出高度结晶的CuO相。为了研究CuO/CuO与CQDs的相互作用，采用了荧光猝灭方法。测量了用不同O/F比制备的样品的双分子猝灭速率常数。CQDs与氧化铜之间的相互作用表明，荧光猝灭很大程度上取决于氧化铜的氧化态，并且可以成为一种通过CQDs检测CuO/CuO的有前途的方法。
