Bhattacharjee, Sudip and Bera, Susmita and Das, Riyanka and Chakraborty, Debabrata and Basu, Akash and Banerjee, Priyabrata and Ghosh, Srabanti and Bhaumik, Asim (2022) A Ni(II) Metal-Organic Framework with Mixed Carboxylate and Bipyridine Ligands for Ultrafast and Selective Sensing of Explosives and Photoelectrochemical Hydrogen Evolution. ACS Applied Materials & Interfaces, 14 (18). pp. 20907-20918. ISSN 1944-8244

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We report a Ni-MOF (nickel metal-organic framework), Ni-SIP-BPY, synthesized by using two linkers 5-sulfoisophthalic acid (SIP) and 4,4'-bipyridine (BPY) simultaneously. It displays an orthorhombic crystal system with the Ama2 space group: a = 31.425 angstrom, b = 19.524 angstrom, c = 11.2074 angstrom, alpha = 90 degrees, beta = 90 degrees, gamma = 90 degrees, and two different types of nickel(II) centers. Interestingly, Ni-SIP-BPY exhibits excellent sensitivity (limit of detection, 87 ppb) and selectivity toward the 2,4,6-trinitrophenol (TNP)-like mutagenic environmental toxin in the pool of its other congeners via ``turn-off'' fluorescence response by the synergism of resonance energy transfer, photoinduced electron transfer, intermolecular charge transfer, pi-pi interactions, and competitive absorption processes. Experimental studies along with corroborated theoretical experimentation, vide density functional theory studies, shed light on determining the plausible mechanistic pathway in selective TNP detection, which is highly beneficial in the context of homeland security perspective. Along with the sensing of nitroaromatic explosives, the moderately low band gap and the p-type semiconducting behavior of Ni-SIP-BPY make it suitable as a photoanode material for visible-light-driven water splitting. Highly active surface functionalities and sufficient conduction band minima effectively reduce the water and result in a seven times higher photocurrent density under visible-light illumination.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 29 Aug 2023 06:26
Last Modified: 29 Aug 2023 06:26

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