Terahertz time domain spectroscopy of hydrothermally synthesized boehmite and ammonium dawsonite nanostructures |
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| Institution: | 1. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore 45650, Islamabad, Pakistan;2. National Institute of Lasers and Optronics (NILOP), Nilore 45650, Islamabad, Pakistan;1. School of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, China;2. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, China;3. Chengdu Lubricant Blending Plant, PetroChina, 188 Xingchuan Avenue, Chengdu, Sichuan 610083, China;1. Institute of Chemical Sciences, University of Peshawar, 25120 Peshawar, Pakistan;2. Department of Metallurgy and Materials Engineering, PIEAS, Islamabad, Pakistan;3. National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan;1. Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad 45650, Pakistan;2. Engineering Ceramic Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-Gu, Changwon, Gyeongnam 642-831, Republic of Korea;1. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod 603950, Russia;2. GYCOM Ltd., Nizhny Novgorod 603950, Russia;3. Peter the Great St. Petersburg Polytechnic University, St. Petersburg 195251, Russia;4. Nizhny Novgorod State University, Nizhny Novgorod 603950, Russia;1. National Centre for Nanotechnology, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore 45650, Islamabad, Pakistan;2. University of Chinese Academy of Sciences (UCAS), 19 A Yuquan Road, Beijing 100049, China |
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| Abstract: | The frequency dependent optical and dielectric properties of boehmite (AlOOH) and ammonium aluminum carbonate hydroxide (AACH) nanostructures, prepared at different temperatures via hydrothermal synthesis, were studied by using terahertz time domain spectroscopy (THz-TDS). The complex refractive indices, absorption coefficients and complex dielectric constants were determined and compared for different synthesis temperatures. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were also performed to confirm the formation of boehmite and AACH. Scanning electron microscopy (SEM) was performed to study the morphology of nanostructures. The study reveals the formation of AACH at higher temperatures and decrease in refractive index with increasing synthesis temperature. The higher absorption coefficient and lower refractive index and dielectric constant were observed for AACH than for boehmite. |
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| Keywords: | Dielectric constant Hydrothermal Refractive index Time domain spectroscopy Boehmite Dawsonite |
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