Author: Nagarajan, Erumaipatty Rajagounder ; Selvapalam, Narayanan ; Sivakumar, Shanmugam ; Rajendran, Pavitra ; Piramuthu, Lakshminarayanan ; Kannan, Jamuna

Supramolecularly stacked acriflavine dye on graphene oxide (GO-Acy) was utilized for the first time to detect aliphatic amines, making it a highly sensitive and selective material. This method involved developing a distinctive, discriminative, and highly selective fluorescent sensor that displayed a 'turn-on' response to aliphatic amines. The sensor probe operated through supramolecular host-guest interactions between the amines and dyes, enabling the detection of aliphatic amines. Upon the interaction of aliphatic amines with bound Acy dye on graphene oxide, the fluorescent sensor exhibited a release of Acy dyes and a rapid appearance of fluorescence. GO-Acy demonstrated high selectivity for 1,4-butanediamine (BD), exhibiting strong fluorescence intensity and accurately distinguishing it from various aliphatic amines, aromatic amines, and amino acids. The fluorescene emission intensities of GO-Acy at λ_em = 510 nm was observed after exposure to different amines, with an excitation wavelength of GO-Acy at λ_ex = 450 nm. In addition to its high selectivity, the sensor probe also exhibited excellent sensitivity towards BD, with a limit of detection (LOD) of 9.9 nM. This graphene-based material proved to be a highly effective tool for detecting aliphatic amines in aqueous media, requiring no special experiments while providing both good selectivity and sensitivity. Additionally, GO-Acy@CB[7] demonstrated diverse responses to aliphatic amines, suggesting its ability to discriminate between them through fluorescence quenching. GO-Acy has proven effective in monitoring fish products that release amine vapors during decomposition. Furthermore, test paper strips made with GO-Acy could quickly detect amines in actual fish samples, highlighting the potential of GO-Acy for food quality inspection.

01 Jun 2025·Journal of Power Sources

Thermal plasma synthesis towards upscaling of multi-cation lithium nickel manganese cobalt oxide cathodes

Author: A, Sona E. ; Subramaniam, Yugeswaran ; Murugan, Ramaswamy ; Viswanathan, Raja ; Pasupathi, Amarnath ; J, Vigneshwaran ; Jose, Sujin P.

The volatility of lithium during high-temperature sintering restricts the synthesis techniques and precursors available for large-scale production of lithium-based materials.This limitation results in a multistep process, reduced control over final product parameters, and increased costs.The primary aim of this work is to develop a streamlined production methodol. for synthesizing Li Ni Mn Co oxide cathodes with fewer steps while quantifying their performance.Thermal Plasma Spray Pyrolysis (TPSP) is a robust technique for the large-scale industrial production of single-cation oxide nanomaterials.In this study, TPSP is employed to synthesize lithium nickel manganese cobalt oxide (Mn rich Li-Ni-Mn-Co oxide with 262 composition), a multi-cation pos. electrode material in minimal step.The optimized TPSP method enables the production of Mn rich lithium Ni-Mn-Co (262) oxide powder at a rate of 2 g min^-1, achieving the desired phase purity.Comprehensive structural, morphol., and elemental analyses confirm the material′s phase purity, uniformity, narrow size distribution, and accurate stoichiometry.The synthesized Li-rich NM_rC, with 5 % excess lithium, exhibited stable performance, delivering discharge capacity of 176 mAh g^-1.The prepared Mn rich lithium Ni-Mn-Co (262) oxide pos. electrode shows an average capacity loss of only 5 % after 50 cycles at a C/10 charge-discharge rate.

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