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Facile ultrasound-assisted synthesis of ZnO nanorods in an ionic liquid
Authors:Tarek Alammar  Anja-Verena Mudring
Affiliation:1. Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India;2. Electrochemical Power Systems Division, Central Electrochemical Research Institute, Karaikudi 630 006, Tamil Nadu, India;1. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran;2. Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran;3. Joint Institute of Advanced Materials and Processes (ZMP) and Chair of Organic Chemistry II, Friedrich-Alexander University of Erlangen-Nürnberg, Henkestraße 42, 91054 Erlangen, Germany;4. Institute Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Martensstraße 7, 91058 Erlangen, Germany;5. Chair of Functional Nanosystems, Research Area of Physical Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 11 (Haus E), 81377 Munich, Germany;1. Department of Physics, University of Minho, Campus de Azurém, 4800-058 Guimaraes, Portugal;2. CBMA, University of Minho, Campus de Gualtar, 4700 Braga, Portugal;3. Instituto de Ciencia de Materiales de Sevilla, CSIC-University of Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain;1. Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran;2. Department of Polymer Engineering, Golestan University, Gorgan 49188-88369, Iran;1. Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;2. Università degli Studi di Milano, Dipartimento di Chimica, Via Golgi 19, 20133 Milano, Italy
Abstract:ZnO nanocrystals have been synthesized by ultrasound-assisted synthesis from Zn(CH3COO)22H2O and NaOH in the neat room-temperature ionic-liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide, C4mim]Tf2N]. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the formed ZnO nanocrystals are of rod like shape with lengths from 50 to 100 nm and diameters of about 20 nm. X-ray diffraction (XRD) confirms the crystallinity as well as the sample purity. The band gap of the as-prepared ZnO nanorods was estimated to be 3.31 eV from UV–Vis absorption measurements. The photoluminescence spectrum shows the characteristic greenish emission of ZnO at room temperature (λmax = 563 nm). The ZnO bonding levels have been determined by X-ray photoelectron spectroscopy (XPS). Nitrogen adsorption–desorption measurements show typical samples to have a specific surface area of 49.93 m2/g.
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