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Highly photoluminescence and wide band gap insulating metal hybrid nanoparticles array of samarium-doped SrO:CoO: synthesis, characterizations and sensor characteristics

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Abstract

In the present work, a new series of Smx (x = 1, 6 and 12 wt.%) doped SrO:CoO (1:1) nanocrystals (NCs) have been synthesized by microwave-assisted method. The as-synthesized Smx:SrO@CoO NCs were characterized by XRD (X-ray diffraction), UV–visible, SEM (scanning electron microscopy), XPS (X-ray photoelectron spectroscopy), BET (Brunauer–Emmett–Teller) and EDX (energy-dispersive X-ray) spectroscopic investigations. Irregular shaped morphology was revealed from SEM micrographs with average size of the agglomerates ~ 70 nm. XRD patterns confirmed the formation of mixed phase of monoclinic and tetragonal crystal structure. Blueshift in optical absorptivity resulted as Sm concentration increases in NCs and direct optical band gap decreases from 3.12 to 2.21 eV. Photoluminescence (PL) studies showed strong near edge ultraviolet green-yellow emissions for Sm6 wt.% and12 wt.%:SrO@CoO NCs when excited at 220, 250, 280 nm (λexcitation). Sm12 wt.%:SrO@CoO NCs showed visible range weak band emissions due to crystal defect and formation of oxygen vacancies. Raman studies of Smx:SrO@CoO showed longitudinal optical mode which confirmed the formation of oxygen vacancies. Raman spectroscopy also revealed the presence of Sm-O-Sm, Sr-O-Sr and Co-O bonds in the crystal lattice. In addition Sm6 wt.% and12 wt.%:SrO@CoO NCs showed highest sensitivity (0.10, at 94 µ-ohm and 0.082, at 253 µ-ohm), response (88.9 and 82.7), and had extremely low time parameters (response time of 12, 20 s and recovery time of 24, 44 s) towards O-xylene gas when subjected for detection of its sensitivity in presence of other volatile gases. Moreover sensor exhibited excellent repeatability and restoration. The wide band gap Smx:SrO@CoO NCs can find applications in the field of high resistive sensors, display technologies, LEDs, etc.

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Data availability

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

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Acknowledgements

All the authors are thankful to centre for advanced materials technology (CMAT), MS Ramaiah Institute of Technology, Bangalore, India, Centre for Nano and Material Sciences (CNMS), Jain University for characterization of the samples and carrying out experimentation.

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Authors and Affiliations

  1. Department of Chemistry, Angadi Institute of Technology and Management (AITM), Savagaon Road, Belagavi, Karnataka, 590009, India

    Vinayak Adimule

  2. Organic and Medicinal Chemistry Laboratory, Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Taluk, Ramanagaram, Bangalore, Karnataka, 562112, India

    Rangappa Keri

  3. Department of Metallurgical and Materials Engineering, Bartin University, Bartin, 74100, Turkey

    Shashanka Rajendrachari

  4. Lipid Nanostructures Laboratory, Centre for Smart Materials, School of Natural Sciences, University of Central Lancashire, Preston, PR12HE, UK

    Pravin Kendrekar & Chandrashekar V. Kulkarni

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  1. Vinayak Adimule
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Contributions

VA conceived the ideas, involved in characterization of the samples, wrote paper and handled revision of the manuscript. SR conceived ideas, experiments, characterization and formulation of the results. PK and CVK involved in the experimentation, interpretation of the spectral results, partially wrote the paper and handled the revision of the manuscript.

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Correspondence to Vinayak Adimule or Chandrashekar V. Kulkarni.

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Adimule, V., Keri, R., Rajendrachari, S. et al. Highly photoluminescence and wide band gap insulating metal hybrid nanoparticles array of samarium-doped SrO:CoO: synthesis, characterizations and sensor characteristics. J Mater Sci: Mater Electron 34, 442 (2023). https://doi.org/10.1007/s10854-023-09899-2

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