Academia.eduAcademia.edu

Figure 5 – uploaded by Dr. Preeti Naruka

See full PDFdownloadDownload figure
Figure 5: Tauc’s plot for ZnO NPs The energy gap of greenly synthesized nanoparticles often comes out to be slightly red or blue shifted due to the above- mentioned reasons [25-28]. Conclusion In this article, we have synthesized Zinc Oxide Nanoparticles by environment friendly plant based synthesis method. Leaves extract of Ocimum Tenuiflorum (TULSD was used as stabilizing, reducing and capping agent. ZnO nanoparticles were obtained in form of yellow powder. By Tauc’s method, their band gap came out to be 2.61 eV which was slightly red shifted from industrial standard value of ZnO NPs. This could be due to surface oxidation and sample aging. Since the band gap of plant- based nanoparticles often tends to be slightly red or blue shifted, this particular method can be used to make ZnO nanoparticles of a slightly narrow band gap. As such NPs show great antibacterial activity, they serve wide range of applications in medical textile like antibacterial bandages, masks gloves etc. They also serve applications in semiconductor devices, photoluminescent devices and harvesting piezoelectric energy. Narrow band gap ZnO NPs are specially required for degradation of organic dyes.

Figure 5 Tauc’s plot for ZnO NPs The energy gap of greenly synthesized nanoparticles often comes out to be slightly red or blue shifted due to the above- mentioned reasons [25-28]. Conclusion In this article, we have synthesized Zinc Oxide Nanoparticles by environment friendly plant based synthesis method. Leaves extract of Ocimum Tenuiflorum (TULSD was used as stabilizing, reducing and capping agent. ZnO nanoparticles were obtained in form of yellow powder. By Tauc’s method, their band gap came out to be 2.61 eV which was slightly red shifted from industrial standard value of ZnO NPs. This could be due to surface oxidation and sample aging. Since the band gap of plant- based nanoparticles often tends to be slightly red or blue shifted, this particular method can be used to make ZnO nanoparticles of a slightly narrow band gap. As such NPs show great antibacterial activity, they serve wide range of applications in medical textile like antibacterial bandages, masks gloves etc. They also serve applications in semiconductor devices, photoluminescent devices and harvesting piezoelectric energy. Narrow band gap ZnO NPs are specially required for degradation of organic dyes.

Related Figures (4)

Figure 1: Ocimum Tenuiflorum Plant
Figure 1: Ocimum Tenuiflorum Plant
Figure 2: Aqueous Leave extract of Ocimum Tenuiflorum Plant
Figure 2: Aqueous Leave extract of Ocimum Tenuiflorum Plant
Figure 3: The process of making ZnO NPs from Ocimum Tenuiflorum leave extract dark place for further characterisation. Figure 3 pictorially
Figure 3: The process of making ZnO NPs from Ocimum Tenuiflorum leave extract dark place for further characterisation. Figure 3 pictorially
To confirm the biogenic synthesis of ZnO and to characterize the optical absorption properties of ZnO, the UV-Visible Spectroscopy was done on the obtained sample. A Shimadzu UV 3600 UV-Vis-NIR spectrometer (Engineering College Bikaner) using Ethanol (99%) as reference has been used and the UV-Vis absorption spectra of the samples were recorded in the wavelength range of 300 to 800 nm at room temperature. Tauc’s method was used to study the obtained data. The obtained absorption spectrum is shown in Figure 4. A peak of absorption spectra specific to ZnO nanoparticles was visible at 335 nm. The absorbance peak is reported to ee ees sees 5 EC Cee ae OT te en oS Ma fe OM 5 EOE ip ROO ROOMS SOME SAMO 20° LRN oh
To confirm the biogenic synthesis of ZnO and to characterize the optical absorption properties of ZnO, the UV-Visible Spectroscopy was done on the obtained sample. A Shimadzu UV 3600 UV-Vis-NIR spectrometer (Engineering College Bikaner) using Ethanol (99%) as reference has been used and the UV-Vis absorption spectra of the samples were recorded in the wavelength range of 300 to 800 nm at room temperature. Tauc’s method was used to study the obtained data. The obtained absorption spectrum is shown in Figure 4. A peak of absorption spectra specific to ZnO nanoparticles was visible at 335 nm. The absorbance peak is reported to ee ees sees 5 EC Cee ae OT te en oS Ma fe OM 5 EOE ip ROO ROOMS SOME SAMO 20° LRN oh
580 California St., Suite 400
San Francisco, CA, 94104
© 2025 Academia. All rights reserved