4.6 Article

Green synthesis of LiZnVO4 nanoparticles and its multiple applications towards electrochemical sensor, supercapacitor, humidity sensing, photoluminescence and antioxidant activities

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DOI: 10.1007/s10854-022-08070-7

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  1. DST Nanomission, Govt. of India, New Delhi [SR/NM/NS-1262/2013]

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In this study, LiZnVO4 nanoparticles (NPs) were synthesized using Hibiscus Rosa Sinensis leaves as a fuel source, and their characteristics and performances were investigated. The results demonstrate the diverse potential applications of LiZnVO4 NPs in optics, antioxidant activity, supercapacitors, and humidity sensing.
LiZnVO4 nanoparticles (NPs) were synthesized by a simple combustion method using Hibiscus Rosa Sinensis leaves as a novel fuel and the prepared NPs were characterized using XRD, FT-IR, morphological analysis by SEM and TEM studies, elemental analysis by EDAX and ICP-MS. XRD data of the synthesized NPs were well-matched with the JCPDS number 038-1332 and it confirms the distorted phenacite structure of LiZnVO4. FT-IR strengthens the bonding of M-M and M-O in LiZnVO4. Optical characteristics of LiZnVO4 NPs were studied by photoluminescence (PL) spectroscopy. Vanadate group of the prepared NPs originates a green emission. Examination of latent finger prints (LFP's) showed a crystal clear patterns under near UV region (365 nm) as they are the prominent techniques in crime investigations. LiZnVO4 NPs exhibit a strong antioxidant property and act as a good sensor to detect sodium nitrite analyte at extremely low concentrations with limit of detection of 27.5 nM. Three-electrode system supercapacitor device has been fabricated and examined the performances. Specific capacitance of LiZnVO4 NPs based supercapacitor was found to be 88.7 F/g at a current density of 0.1 mA. Power density (P-d) and energy density (E-d) were found to be 0.51 W/g and 12.3 Wh/Kg, respectively. This device exhibits a stable CV curves up to the scan rate of 10 V/s. Furthermore, LiZnVO4 NPs acts as an excellent material towards the humidity sensing with a sensitivity factor, sensitivity and limit of detection of 28.0, 0.3 M omega/%RH and 5%RH, respectively. All the above studies show the diverse potentiality of LiZnVO4 NPs.

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