Optimization of the CVD parameters for ZnO nanorods growth: Its photoluminescence and field emission properties. (September 2018)

• Record Type: Journal Article
• Authors: Kumar, Sudhisht; Sahare, P.D.; Kumar, Surender
• Is Part Of: Materials research bulletin. Volume 105(2018)
• Page Start: 237
• Page End: 245
• Publication Date: 2018-09
• Subjects: Zinc oxide -- Gold catalyst -- Seed layer -- CVD -- Nanorods -- Field emission; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.05.002
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Home-made CVD reactor fabricated and successfully used for growing ZnO nanorods. Growth of nanostructures depends on several CVD process parameters. CVD parameters, flow rate of carrier gas, substrate temperature, Au catalyst droplet size, growth time duration, etc. optimized. The mechanism of crystal growth understood by studying FESEM/TEM/XRD. Photoluminescence and Field emission studies done for defects and applications. Abstract: Vertically aligned single crystalline ZnO nanorods arrays were grown on a silicon substrate in a CVD reactor using Au as a catalyst. The CVD parameters such as substrate temperature, catalyst layer thickness/morphology and reaction time play a crucial role in the synthesis of nanostructures by the vapor-liquid-solid process. By optimizing these various CVD parameters, highly controlled guided growth of ZnO nanorods was achieved. The structural and morphological properties of resultant ZnO nanorods were studied by means of X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction and field emission scanning electron microscopy. The photoluminescence spectroscopy was also done to investigate the defects in grown ZnO nanorods. The field emission results of nanorods array indicated that the properties of the field emission follow Fowler–Nordheim law. The nanorods (grown for 20 min) are vertically aligned on the substrate surface without entanglements and with good crystal quality as well which is very important for several applications.