Properties of Semiconductors: Synthesis of Oriented ZnO for Photoelectrochemistry and Photoremediation

Autor/inn/en	Koenig, Emma; Jacobs, Ari; Lisensky, George
Titel	Properties of Semiconductors: Synthesis of Oriented ZnO for Photoelectrochemistry and Photoremediation
Quelle	In: Journal of Chemical Education, 94 (2017) 6, S.738-742 (5 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Lisensky, George)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
DOI	10.1021/acs.jchemed.6b00887
Schlagwörter	Leitfaden; Unterricht; Lehrer; Science Instruction; College Science; Undergraduate Study; Inorganic Chemistry; Cooperative Learning; Energy; Science Laboratories; Spectroscopy; Science Experiments; Laboratory Experiments; Light; Scientific Concepts + Suchen Sie Ihr Suchwort? Lesson concept; Instruction; Unterrichtsentwurf; Unterrichtsprozess; Teacher; Teachers; Lehrerin; Lehrende; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Grundstudium; Anorganische Chemie; Kooperatives Lernen; Energie; Spektroskopie; Laboratory work; Laborarbeit; Licht
Abstract	Semiconductors are an important class of materials; preparing ZnO nanorods allows semiconducting properties to be easily observed. The week before lab, groups of four students take 15 min to setup two fluorine-doped tin oxide glass (FTO) slides in a zinc nitrate and hexamethylenetetramine solution stored at 90°C until the next lab. Hexagonal ZnO nanorods oriented along the c-axis are produced, as shown by X-ray diffraction (XRD) and scanning electron microscopy (SEM) images. Semiconductor properties are observed by measuring the band gap by UV-visible absorption spectroscopy and exposing samples to UV light to excite electrons into the conduction band. One pair of students obtains SEM and photoelectrochemical measurements, while the other pair obtains an absorption spectrum, XRD scan, and methylene blue kinetic data. The primary pedagogic goal of the experiment is to reinforce semiconductor concepts where two teams collaborate to summarize their evidence that ZnO is a semiconductor. (As Provided).
Anmerkungen	Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01