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Green synthesis of Au on ZnO (Au/ZnO) nanoparticles using Ocimum americanum leaf extract: Nature changes of optic, structure, and morphology

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AIP Conference Proceedings 2021年第1期2381卷

作者： Iwan Syahjoko Saputra Shifa Dwi Koesumahelmi Yoki Yulizar Sudirman 1Study Programme of Cosmetic Technology Department of Science and Technology Sumatera Institute of Technology South lampung 35365 Indonesia 2Department of Chemistry Faculty of Mathematics and Natural Science University of Indonesia Depok 16424 Indonesia 3Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of Indonesia BATAN Kawasan PUSPIPTEK Gd. 71 Tangerang Selatan Banten 15314 Indonesia

Green synthesis of Au on ZnO nanoparticles surface were successfully prepared using Ocimum americanum leaf extract. The reaction was carried out at room temperature using the green synthesis method. The nature changes of optic, structure, and morphology of Au on ZnO nanoparticles surface were characterized using UV-vis diffuse reflectance spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Energy-dispersive X-ray spectroscopy (EDS). UV-vis DRS showed the change of optical properties and the band gap energy values of ZnO and Au/ZnO nanoparticles from 3.21 eV to 3.09 eV. Analysis of FTIR showed the decrease of absorption peak in functional group of -OH, C=C, moreover there is a shift in C-C absorption peak and strong vibration of Zn-O-Au which occurred at wavenumber of 519 cm−1. XRD showed the crystallite size average of ZnO and Au/ZnO is 65.78 nm and 81.99 nm. SEM showed the morphology of Au/ZnO is sphere. EDX shows the mass percent of element composition for Au, Zn, and O is 2.28, 75.50, and 16.11. From the existed data, can be concluded the presence of gold greatly affects to optical properties, structure, and morphology of ZnO nanoparticles surface.

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Green synthesis of Au-doped ZnO nanoparticles by in-situ process using Imperata cylindrica L leaf extract

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AIP Conference Proceedings 2021年第1期2349卷

作者： Emil Budianto Yoki Yulizar Iwan S. Saputra Sudirman Sudirman 1Department of Chemistry Faculty of Mathematics and Natural Science University of Indonesia Depok 16424 Indonesia 2Study Programme of Cosmetic Technology Department of Science and Technology Sumatera Institute of Technology South Lampung 35365 Indonesia 3Center for Science and Technology of Advanced Materials-National Nuclear Energy Agency Serpong Area South Tanggerang 15314 Indonesia

Au-doped ZnO nanoparticles were synthesized using eco-friendly substance of Imperata cylindrica L (ICL) leaf extract by the in-situ process. The function of Imperata cylindrica L leaf extract as a medium for the formation reaction of Au-doped ZnO nanoparticles. Powders of Au-doped ZnO nanoparticles was analyzed using Diffuse Reflectance Spectroscopy (UV-Vis DRS), Fourier Transform Infra-red Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and Raman Spectroscopy. UV-Vis DRS showed the value of the band gap of ZnO changed from 3.2 eV to 2.5 eV. FTIR showed a reduced -OH absorption peak at wavenumber of 3429 cm−1, 1182 cm−1 and the vibration at 502 cm−1 indicated that Au-doped ZnO nanoparticles successfully synthesized. XRD showed of Au-doped ZnO nanoparticles has a crystallite size of 21.37 nm and decreasing peaks of crystallinity in the miller index (100). The results of SEM-EDX showed the changes of morphology Au-doped ZnO nanoparticles from hexagonal to sphere with the composition of elements is Zn, O and Au. Raman spectroscopy showed a strong vibration peaks at 320 cm−1, 410 cm−1, 590 cm−1 and 1090 cm−1.

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