Lanthanum (La) doped zinc oxide (ZnO) nanomaterials (La x Zn 1-x O, x = 0.0, 0.03, 0.05, 0.07 M) were synthesized via co-precipitation method using zinc acetate, lanthanum nitrate as precursors, octylamine as capping and reducing agent. The structures, morphologies, optical activity and antibacterial properties of La x Zn 1-x O were investigated by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, High resolution scanning electron microscopy (HR-SEM), Energy dispersive X-ray (EDX), UV-Visible, Photoluminescence (PL) spectroscopy.The antibacterial activities of La x Zn 1-x O were tested by modified disc diffusion method. The XRD results showed that the La 3+ ions were successfully incorporated into the ZnO host, and the

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l-Tryptophanium picrate was synthesized and evaluated for its supercapacitor behavior and a 263 F g−1 specific capacitance was achieved.

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