A facile route to ZnO nanorod arrays using wet chemical method

Temperature‐Controlled Synthesis and Photocatalytic Performance of ZnO Nanoplatelets

“…ZnO, an n-type, wide band gap semiconductor (E g = 3.4 eV), [1][2][3][4] is one of the most important functional oxides for its interesting chemico-physical properties, such as large exciton binding energy (60 meV), [5][6][7][8] optical transparency, UV emission and electric conductivity, together with a good stability and low toxicity. [7,[9][10][11] On this basis, zinc oxide is extensively considered for various applications, from optoelectronics to energetics, sensing, and photocatalysis.…”

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Zinc oxide nanoplatelets are successfully grown on Si(100) by CVD starting from a second-generation Zn II precursor, Zn(hfa) 2 ÁTMEDA (Hhfa = 1,1, 1,5,5, TMEDA= N,N,N′,. The synthesis is performed in a nitrogen + wet oxygen atmosphere under optimized conditions, at temperatures between 250 and 500°C.

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Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method

“…As shown in the XRD pattern ( Figure 3, black line), the seed layer exhibits only a (002) diffraction peak, which indicates its high orientation with c-axis perpendicular to the substrate. Due to the natural properties of the polar crystal, the polar surfaces can be easily charged positively or negatively [25]. Thus, the ZnO seed layer surface consists of a positively-charged polar Zn 2+ -terminated (001) plane or a negatively-charged polar O 2− -terminated (001) plane [30,32].…”

“…Continuously, the polar surfaces absorb the growth units and repeat dehydration to form ZnO crystal until the supply of growth units stops. Thus, the crystal growth rate is faster along the c-axis than other nonpolar surfaces [25]. It is easy to obtain ZnO nanorod arrays with high alignment perpendicular to the substrate with the ZnO seed layer.…”

“…Various methods have been used to synthesize ZNAs, including chemical vapor deposition (CVD) [21,22], pulsed laser deposition (PLD) [23], molecular beam epitaxy (MBE) [10,24], etc. Compared to these methods, the aqueous solution method [25,26] has emerged more recently, which paves a facile way to obtain preferred-aligned ZNAs on various substrates just by pre-coating a ZnO seed layer. Furthermore, the aqueous solution method is always conducted under low temperature (<95 • C), which extends its application on the temperature-sensitive substrates.…”