School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.
NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower #15-02, 138602, Singapore.
Chemosphere. 2022 Sep;303(Pt 3):135090. doi: 10.1016/j.chemosphere.2022.135090. Epub 2022 May 31.
In this study, we propose a unique use of silver-carbon dot nanohybrid (Ag@CDs) with an average size of 16 nm as a multi-mode sensor for the selective detection of Fe and the construction of logic gates based on these unique detection properties. The Ag NPs exhibit colourimetric sensing and fluorescence quenching in response to Fe in the concentration range of 10-100 ppm, with the carbon dots acting as the fluorescent entity. Surprisingly, the nanohybrid was shown to have excellent sensitivity to Fe, resulting in aggregation and formation of yellowish-brown clumps. When the reaction mixture was treated with Fe, there was a discernible change in the colour of the assay mixture and fluorescence quenching. That is, the Ag@CDs acted as a calorimetric and fluorescence multi-mode sensor. Even in interfering groups in the natural river water sample, the produced nanohybrid displayed good selectivity towards Fe, with a minimum LOD of 0.76 ppm. Further, we constructed an advanced logic system, IMP-OR gate, by using additional inputs - ascorbic acid and urea.
在这项研究中，我们提出了一种独特的使用银-碳点纳米杂化（Ag@CDs）的方法，其平均尺寸为 16nm，作为一种多模式传感器，用于选择性检测 Fe，并基于这些独特的检测特性构建逻辑门。Ag NPs 表现出对 Fe 的比色和荧光猝灭反应，其浓度范围为 10-100ppm，其中碳点作为荧光实体。令人惊讶的是，纳米杂化物对 Fe 具有优异的灵敏度，导致聚集和形成黄棕色团块。当将反应混合物用 Fe 处理时，测定混合物的颜色和荧光猝灭有明显的变化。也就是说，Ag@CDs 是一种比色和荧光多模式传感器。即使在天然河水样品的干扰组中，所制备的纳米杂化物对 Fe 也表现出良好的选择性，最低检出限为 0.76ppm。此外，我们通过使用额外的输入 - 抗坏血酸和尿素，构建了一个先进的逻辑系统，IMP-OR 门。
