Ag@CDs nanohybrid: Fabrication, design of a multi-mode chemosensory probe for selective Fe3+ detection and logic gate operation. (September 2022)

• Record Type: Journal Article
• Authors: Ajith, M.P.; Pardhiya, Sonali; Prabhakar, Arun Kumar; Rajamani, Paulraj
• Is Part Of: Chemosphere. Volume 303:Part 3(2022)
• Publication Date: 2022-09
• Subjects: Carbon dots (CDs) -- Ag NPs -- Ag@CDs -- Heavy metal sensors -- Logic operations; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.135090
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: 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 3+ 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 3+ 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 3+, resulting in aggregation and formation of yellowish-brown clumps. When the reaction mixture was treated with Fe 3+, 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 3+, 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. Graphical abstract: Image 1 Highlights: Fabrication of silver NPs–biogenic carbon dot nanohybrid (Ag@CDs). Ag@CDs as a calorimetric and fluorescence multi-mode sensor for Fe 3+ detection. Selective complex formation of Ag@CDs with Fe 3+ and aggregation. LOD of 0.76 ppm in presence of interfering groups in natural river water sample. Ag@CDs as a probe to build a sophisticated logic system, IMPLICATION-OR.