Zheng, Chong (Professor of chemistry)
Ph.D. (Doctor of Philosophy)
Department of Chemistry and Biochemistry
The synthesis of new semiconducting materials with novel electrical properties is of great importance to many fields of industrial manufacturing and electronics. Semiconducting materials often possess photocatalytic properties in addition to their potential future utilization as components in next-generation solidstate electronic components. This study is of a group of three new semiconducting materials that were synthesized by finely grinding mixes each consisting of a rare earth such as lanthanum, one or more metals or metalloids, a metal halide flux, and optionally an oxidizer such as sulfur. After grinding, the mixes were placed in electric furnaces for periods of between one and two weeks at temperatures to 1000° C. Following cleaning of any residual traces of the flux compounds, these crystalline solids were structurally analyzed via EDICS and single-crystal x-ray diffraction and some of their bulk material properties were catalogued. In some cases, photocatalytic properties with respect to methylene blue and methyl orange were observed, documented, and compared to known standard photocatalytic compounds in the same media.
Bryhan, Douglas N., "The high-temperature synthesis and an investigation of the optical and catalytic properties of transition metal chalcogenide compounds" (2007). Graduate Research Theses & Dissertations. 5820.
xiii, 195 pages (some color pages)
Northern Illinois University
Rights Statement 2