Co-precipitation synthesis,humidity sensing and photoluminescence properties of nanocrystalline Co2+ substituted zinc(II)molybdate (Zn1–xCoxMoO4; x = 0, 0.3, 0.5, 0.7, 1) |
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| Institution: | 1. Chemical Engineering Department, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India;2. Chemical Engineering Department, Vishwakarma Institute of Technology, Pune 411037, MS, India;3. Department of Chemical Engineering, National Institute of Technology, Warangal 506004, AP, India;4. Chemical Engineering Department, Institute of Chemical Technology, Mumbai 400019, MS, India;1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Acad. Lavrentiev Ave. 3, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogov St. 2, Novosibirsk 630090, Russia;3. Baikal Institute of Nature Management, Siberian Branch, Russian Academy of Sciences, Sakh’yanova St. 6, Ulan-Ude, 670047 Buryat Republic, Russia;4. Buryat State University, Smolin St. 24a, Ulan-Ude, 670000 Buryat Republic, Russia;1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;3. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand |
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| Abstract: | Zinc-cobalt molybdate composites (Zn1–xCoxMoO4; x = 0, 0.3, 0.5, 0.7, 1) were synthesised by a simple co-precipitation method and characterised by thermogravimetric/differential thermal analysis (TG/DTA), Fourier transform-infrared (FT-IR), Fourier transform Raman (FT-Raman) spectroscopy, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM/EDAX) and transmission electron microscopy (TEM). The surface area was calculated by BET analysis in the adsorption/desorption isotherm. The humidity sensing properties of zinc-cobalt molybdates were tested by dc electrical measurements at different relative humidity environments (RH = 5–98%). The electrical resistance of the composites linearly decreases and the maximum sensitivity of 3672 ± 110 was observed for the Zn0.3Co0.7MoO4 (ZnCM-4) composite towards humidity, which is calculated by the relation Sf = R5%/R98%, where the response time is 200 s and the recovery time is 100 s. Photoluminescence (PL) measurement at the room temperature of ZnM-1 composite exhibited a blue emission peak at 475 nm (λem) when excited at a wavelength (λex) of 430 nm. During Co2+ substitution in Zn2+ matrix, a green and red emission peak was observed when excited at a wavelength (λex) of 520 nm. |
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| Keywords: | Scheelite type Zinc-cobalt molybdate Humidity sensor Photoluminescent Characterisation SEM analysis |
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