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Synthesis of ZnO Nanoparticles by Solvothermal Method and Their Ammonia Sensing Properties

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Abstract:

ZnO nanoparticles were prepared by a simple solvothermal route by using a ethylene glycol (EG)–ethanol (E) solvent system. The shape and size of ZnO nanoparticles were tuned by changing the volume composition of the solvents and the synthesis temperature. Phase purity was confirmed by X-ray diffraction (XRD) and crystal size was determined by transmission electron microscopy (TEM). Ellipsoidal and spherical nanoparticles were obtained by varying the volume ratio of the solvents. Mostly spherical nanoparticles with average diameter of 4 nm was synthesized with higher volume fraction of EG at a lower synthesis temperature. The blueshift of room-temperature photoluminescence measurement from free exciton transition are observed for the smallest nanoparticle size that is ascribed to the quantum confinement effect. The ammonia gas sensing characteristics of the smallest diameter nanoparticles showed better sensitivity at a relatively lower temperature than that of large diameter particles.

Keywords: NANOPARTICLES; PHOTOLUMINESCENCE; TRANSMISSION ELECTRON MICROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.1290

Publication date: October 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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