Chemical Vapor Synthesis, Colloidal Processing and Sintering of ZnO Nanoparticles

C. Schilling, A. Sandmann, M. Ali, D. Gautam, A. Khalil, C. Notthoff, M. Winterer
University of Duisburg-Essen, DE

Keywords: nanoparticle synthesis & applications

Summary:

Zinc oxide (ZnO) is through it’s fundamental material properties – wide band gap semiconductor with a high exciton binding energy [1] – a material with a broad application spectrum for example in solar cells, light emitting devices, chemical sensors or heterogeneous catalysis [2]. Nanoscaled ZnO such as nanocrystalline particles provide additional advantages through size or surface effects and improved processibility making it an even more versatile, truly advanced material. We review our research of the last decade on chemical vapor synthesis (CVS) of ZnO nanoparticles, their colloidal processing and sintering and related aspects in applications [3-8]. CVS of ZnO can control particle characteristics such as defect [4] and dopant type [3, 5] and density, crystallinity [4], agglomeration, microstructure, morphology (Fig. 1) [7], and surface chemistry [6] as determined by detailed characterization using. These characteristics have profound impact on the processibility as colloid and during sintering (Fig. 2) [8], as well as properties. [1] S. J. Pearton, D. P. Norton, K. Ip, Y. W. Heo and T. Steiner, Progr. Mater. Sci. 50 (2005), 293 [2] A. Moezzi, A. M. McDonagh, and M. B. Cortie, Chem. Eng. J. 185-186 (2012), 1 [3] J. Brehm, M. Winterer, and H. Hahn, J. Appl. Phys. 100 (2006), 064311 [4] M. Ali, N. Friedenberger, M. Spasova, and M. Winterer, Chem. Vap. Dep. 15 (2009), 192 [5] R. Djenadic, G. Akgul, K. Attenkofer, and M. Winterer, J. Phys. Chem. C 114 (2010), 9207 [6] M. Ali, M. D. Donakowski, C. Mayer, and M. Winterer, J. Nanopart. Res. 14 (2012), 689 [7] C. Schilling, R. Theissmann, C. Notthoff, and M. Winterer, Part. Part. Syst. Charact. 30 (2013), 434 [8] A. Sandmann, C. Notthoff, and M. Winterer, J. Appl. Phys. 113 (2013), 044310