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<p>A study on samarium-doped zinc oxide nanopetals revealed significant effects of annealing time on their structural, optical and electrochemical properties. When annealed at 500°C for 1 h (ZS1) and 2 h (ZS2), the nanopetals exhibited a notable increase in crystallite size, from 28 to 44 nm. Furthermore, the absorption edge shifted to lower energies, resulting in a reduced optical bandgap. The PL intensity of the three samples goes in the order of ZS &lt; ZS1 &lt; ZS2. These findings highlight the importance of annealing time in tailoring the optical properties of samarium-doped zinc oxide nanopetals. Characterization was carried out by XRD, SEM, HR-TEM, EDX and BET studies. The sample demonstrated potent antibacterial activity, inhibiting pathogen growth by up to 26 mm after 2 h of annealing at 500°C. Electrochemical analysis was performed using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) analyses. The GCD results revealed that ZS1 had a specific capacitance of 1062.7 Fg<sup>–1</sup>, while ZS2 had a higher value of 1833.1 Fg<sup>–1</sup> at 20 mA. A notable increase in capacitance was observed with prolonged annealing time.</p>

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Effect of annealing time on the supercapacitive performance of Sm-doped ZnO nanopetals synthesized via the wet chemical method

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • P. Parvathy,
  • R. Ganapathi Raman,
  • V. N. Meena Devi

摘要

A study on samarium-doped zinc oxide nanopetals revealed significant effects of annealing time on their structural, optical and electrochemical properties. When annealed at 500°C for 1 h (ZS1) and 2 h (ZS2), the nanopetals exhibited a notable increase in crystallite size, from 28 to 44 nm. Furthermore, the absorption edge shifted to lower energies, resulting in a reduced optical bandgap. The PL intensity of the three samples goes in the order of ZS < ZS1 < ZS2. These findings highlight the importance of annealing time in tailoring the optical properties of samarium-doped zinc oxide nanopetals. Characterization was carried out by XRD, SEM, HR-TEM, EDX and BET studies. The sample demonstrated potent antibacterial activity, inhibiting pathogen growth by up to 26 mm after 2 h of annealing at 500°C. Electrochemical analysis was performed using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) analyses. The GCD results revealed that ZS1 had a specific capacitance of 1062.7 Fg–1, while ZS2 had a higher value of 1833.1 Fg–1 at 20 mA. A notable increase in capacitance was observed with prolonged annealing time.