Tuning the optical properties of zirconium-based metal-organic frameworks by post-synthetic modifications

Biswal, Soumya Prakash; Panda, Jagannath; Samantaray, Taponitya; Swain, Jaykishon; Bera, N. C.; Agasti, Nityananda; Saji, Viswanathan S.; Sahu, Rojalin; Samantaray, Raghabendra; Lockard, Jenny V.

doi:10.1016/j.matlet.2023.134497

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…If these regions were larger, the phonon would not last long enough to produce a clear Raman signal. (ii) The dominance of the Nb/Ti-O vibrational modes (A1) could be ascribed to the second one around 260 cm -1 , (iii) The Raman peaks in the 450 cm -1 to 700 cm -1 range can be ascribed to the vibration of the NbO6 or TiO6 octahedral and (iv) The peaks beyond 700 cm -1 could be ascribed to the overlap of A1&E(LO) bands [21,22]. The presence of different Bi 3+ and Na + ions causes A-site disorder, which in turn leads to overlapping peaks, resulting in broad peaks.…”

Section: Structural Analysismentioning

confidence: 99%

Structural and electrical properties of 0.98(KO\(_{0.5}\)NaO\(_{0.5}\)NbOO\(_{3}\))-0.02(BiO\(_{0.5}\)NaO\(_{0.5}\)TiOO\(_{3}\)) ceramics

BEHERA,

HAJRA,

PANDA

et al. 2023

J Met Mater Miner

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In the present communication, lead-free ceramics having composition 0.98(K0.5Na0.5NbO3)-0.02(Bi0.5Na0.5TiO3) were synthesized by a high-temperature solid-state reaction route. The Rietveld refinement for the 0.98KNN-0.02BNT reveals an MPB with phase fraction Amm2 (87.76 %) and Pm-3m (12.27%). The SEM study predicted a mean diameter of 0.98KNN-0.02BNT grains as 0.52µm±0.19. The 0.98KNN-0.02BNTceramic displayed a typical hysteresis loop with a remnant polarisation(Pr) of 7.0 μC/cm2, saturation polarization (Ps) of 16 μC/cm2, and a coercive field (Ec) of 26 kV/mm. The electrical, Raman spectra, dielectric, and hysteresis loop study supported a morphotropic phase boundary. The synthesized KNN-BNT lead-free material can be an excellent material for designing new devices like ultrasonic transducers and piezo-actuators.

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Section: Structural Analysismentioning

confidence: 99%

Structural and electrical properties of 0.98(KO\(_{0.5}\)NaO\(_{0.5}\)NbOO\(_{3}\))-0.02(BiO\(_{0.5}\)NaO\(_{0.5}\)TiOO\(_{3}\)) ceramics

BEHERA,

HAJRA,

PANDA

et al. 2023

J Met Mater Miner

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“…[35,41,42] Moreover, they are structurally and functionally conformable via different methods, such as pre-functionalization [43] and post-synthetic modification (PSM). [44,45] Luminescence may underline metal-based emission and/or ligand-localized emission that can be ligand-to-metal charge transfer (LMCT), metal-to-ligand charge transfer (MLCT), or ligand-to-ligand charge transfer (LLCT). [46] To date, many LMOFs have been developed for the luminescent detection of acetone.…”

Section: Introductionmentioning

confidence: 99%

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

et al. 2023

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UiO‐66‐NH2‐IM, a fluorescent metal‐organic framework (MOF), was synthesized by post‐synthetic modification of UiO‐66‐NH2 with 2‐imidazole carboxaldehyde via a Schiff base reaction. It was examined using various characterization techniques (PXRD, FTIR, NMR, SEM, TGA, UV‐Vis DRS, and photoluminescence spectroscopy). The emissive feature of UiO‐66‐NH2‐IM was utilized to detect volatile organic compounds (VOCs), metal ions, and anions, such as acetone, Fe3+, and carbonate (CO32‐). Acetone turns off the high luminescence of UiO‐66‐NH2‐IM in DMSO, with the limit of detection (LOD) being 3.6 ppm. Similarly, Fe3+ in an aqueous medium is detected at LOD = 0.67 μM (0.04 ppm) via quenching. On the contrary, CO32‐ in an aqueous medium significantly enhances the luminescence of UiO‐66‐NH2‐IM, which is detected with extremely high sensitivity (LOD = 1.16 µM, i.e., 0.07 ppm). Large Stern‐Volmer constant, Ksv, and low LOD values indicate excellent sensitivity of the post‐synthetic MOF. Experiments supported by density functional theory (DFT) calculations discern photo‐induced electron transfer (PET), resonance energy transfer (RET), inner filter effect (IFE), or proton abstraction as putative sensing mechanisms. NMR and computational studies propose a proton abstraction mechanism for luminescence enhancement with CO32‐. Moreover, the optical behavior of the post‐synthetic material toward analytes is recyclable.

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Tuning the optical properties of zirconium-based metal-organic frameworks by post-synthetic modifications

Cited by 2 publications

References 10 publications

Structural and electrical properties of 0.98(KO\(_{0.5}\)NaO\(_{0.5}\)NbOO\(_{3}\))-0.02(BiO\(_{0.5}\)NaO\(_{0.5}\)TiOO\(_{3}\)) ceramics

Structural and electrical properties of 0.98(KO\(_{0.5}\)NaO\(_{0.5}\)NbOO\(_{3}\))-0.02(BiO\(_{0.5}\)NaO\(_{0.5}\)TiOO\(_{3}\)) ceramics

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

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