Influence of substrate surface energy and surfactant on crystalline morphology and surface defect density in hydrothermally-grown ZnO nanowires
| Autor: | Jun-Chan Choi, Hak-Rin Kim, Yoonseuk Choi, Han Jae Shin, Byeonggon Kim, Imtiaz Mahmud, Ji-Sub Park, Young-Chul Shin |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoluminescence Aqueous solution Passivation Mechanical Engineering Nanowire chemistry.chemical_element 02 engineering and technology Zinc 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Crystallinity Chemical engineering chemistry Pulmonary surfactant Mechanics of Materials General Materials Science 0210 nano-technology Layer (electronics) |
| Zdroj: | Materials Science in Semiconductor Processing. 77:64-73 |
| ISSN: | 1369-8001 |
| DOI: | 10.1016/j.mssp.2018.01.014 |
| Popis: | We investigated the influence of substrate surface energy before seed layer formation on hydrothermally grown zinc oxide (ZnO) nanowires (NWs). The qualities of ZnO NWs prepared by the surface-enhanced growth method with ultraviolet ozone (UVO) treatment were analyzed in terms of crystalline morphology and surface defect density, and were compared with those of ZnO NWs prepared by the conventional bulk-enhanced growth method adopting polyethyleneimine (PEI) as the surfactant in an aqueous growth solution. In both cases, a positive effect on the morphological properties and crystallinity of ZnO NWs was observed; however, the surface-enhanced growth method was more efficient for obtaining hydrothermally grown ZnO NWs with higher aspect ratios and larger surface areas. The ZnO NW growth rate in the surface-enhanced growth method was two times faster than in the conventional bulk-enhanced growth method. Photoluminescence (PL) spectra and time-resolved PL (TR-PL) responses indicated that a high density of oxygen vacancies on ZnO NW surfaces was produced by the surface-enhanced growth method, because highly oriented ZnO NWs can be grown without surface passivation effect, on the contrary with the bulk-enhanced growth method. |
| Databáze: | OpenAIRE |
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