On the synthesis of Zn/ZnO core–shell solid microspheres on quartz substrate by thermal evaporation technique

Autor:	Deepak Chhikara, M. Senthil Kumar, K.M.K. Srivatsa
Rok vydání:	2015
Předmět:	Photoluminescence Materials science Heterojunction Condensed Matter Physics Microsphere Core (optical fiber) symbols.namesake Chemical engineering symbols General Materials Science Electrical and Electronic Engineering Well-defined Raman spectroscopy Quartz Wurtzite crystal structure
Zdroj:	Superlattices and Microstructures. 82:368-377
ISSN:	0749-6036
DOI:	10.1016/j.spmi.2015.02.036
Popis:	Well defined solid Zn/ZnO core–shell hetero-structures have been successfully synthesised on quartz substrate by thermal evaporation technique. By introducing a thin layer of CeO 2 over quartz the ZnO micro-droplets have been converted into microspheres due to change of nature of quartz surface from hydrophilic to hydrophobic. The microspheres have wurtzite hexagonal structure and have an average size of about 40–60 μm. By using focussed ion beam etching and elemental analyses, the microspheres are found to have solid Zn core with a cover of ZnO on the surface confirming the formation of Zn/ZnO core–shell heterostructure. The photoluminescence spectrum exhibited an intense near band-edge emission peak at 377 nm along with a weak green band emission. The Raman spectrum of microspheres showed the characteristic wurtzite ZnO peak at 437 cm −1 . A possible growth mechanism has been proposed for the growth of Zn/ZnO core–shell structures based on vapor–liquid–solid (VLS) process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::39484470c7d97dd4cc387c8d719d1e05 https://doi.org/10.1016/j.spmi.2015.02.036 Zobrazit plný text záznamu Full Text from ScienceDirect