Two Significant Factors Affecting the Dimensions of the ZnO Nanorods During Chemical Bath Deposition: Precursor Solution Concentration and HMTA Content

Authors : Memnune KARDEŞ, Koray ÖZTÜRK
Pages : 757-767
Doi:10.16984/saufenbilder.1241020
View : 68 | Download : 65
Publication Date : 2023-08-25
Article Type : Research Paper
Abstract :The effects of zinc ion concentration and hexamethylene tetramine insert ignore into journalissuearticles values(HMTA); content of the aqueous precursor solution on the aspect ratios of the one-dimensional insert ignore into journalissuearticles values(1D); ZnO nanorods during chemical bath deposition insert ignore into journalissuearticles values(CBD); were investigated. The ZnO nanorods were grown on these seeded substrates by the low-temperature CBD method at 95 °C for 5 h. In the first part of this investigation the zinc nitrate hexahydrate insert ignore into journalissuearticles values(ZNH); to HMTA molar ratio was kept constant at a ratio of 1:1 for each of the CBD solutions prepared with different Zn^insert ignore into journalissuearticles values(+2); ion concentrations of 0.025, 0.035, 0.050, and 0.075 M. The number densities of the nanorods insert ignore into journalissuearticles values(i.e., number of nanorods per unit area); were increased with the increasing concentration. In the second part, the ZNH to HMTA molar ratio was varied to differ from the 1:1 value and, in turn, to obtain the precursor solutions relatively rich in Zn^insert ignore into journalissuearticles values(+2); or OH^-ions. Here, the concentration of the precursor solution was kept constant at 0.05 M. The lateral growth perpendicular to the c-axis of the ZnO nanorods was found to be suppressed with the increasing HMTA content insert ignore into journalissuearticles values(e.g., for the ZNH to HMTA molar ratio of 0.4: 1); due to its capping effect. However, the precursor solution containing an excessive amount of HMTA led to a decrease in the probability of crystal growth, which has been attributed to the OH^- ion enrichment.
Keywords : ZnO nanorods, CBD, HMTA, Aspect ratio, Crystal growth

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