Realization of wide size range 1D ZnO micro/nano rods for versatile micro/nano devices by controlled seed layer thickness

Growth behavior of Al-doped zinc oxide microrods with times

“…3(a), the pH value of the initial AZO solution is $5.5. During the initial 3 h (region I), the ZnO seed layer could be partially etched because of the weak acidity of the solution, leading to the growth of randomly distributed microrods [4,13,15]. Between 3 h and 6 h (region II), the pH is close to neutrality and the microrods grow dramatically.…”

“…The characteristics of nano and microrods are strongly related to the growth conditions (temperature [6,7], time [7][8][9], doping [8,[10][11][12], pH [4,7,13,14], etc.). Sun et al reported that nano and micro morphological changes occurred in ZnO by controlling the thickness of the seed layer [15]. Zheng et al found that the morphologies of ZnO grown on Pt-coated Si substrates changed from nanorods to microrods with and without Al [16].…”

Low temperature synthesis of spindle‐like ZnO nanostructures under microwave irradiation

“…As an important II-VI semiconductor with a band gap of about 3.4 eV and a large exciton binding energy of 60 meV [1,2], ZnO has attracted continuous interest in the area of nanotechnology due to its remarkable properties, such as large piezoelectric constants, excellent thermal stability, transparency, wide electrical conductivity range, and biocompatibility [3][4][5][6][7][8]. Since the properties of ZnO are highly dependent on their size, shape and crystalline structure, up to now, well-defined ZnO nanostructures with an abundant variety of shapes and sizes have been synthesized via various physical and chemical routes, such as vapour deposition [9,10], thermal evaporation [11], sol-gel [12], hydrothermal [13] and low-temperature wet-chemistry [14,15] methods, etc.…”