Post-Annealing Effects on Properties of ZnO Nanorods Grown on Au Seed Layers

Abstract

ZnO nanorods were grown by hydrothermal method. Two kinds of seed layers, Au film and island seed layers were prepared to investigate the effect of seed layer on ZnO nanorods. The ZnO nanorod on Au island seed layer has more unifom diameter and higher density compared to that of ZnO nanorod on Au film seed layer. The ZnO nanorods on Au island seed layer were annealed at various temperatures ranging from 300 to 850 o C. The pinholes at the surface of the ZnO nanorods is formed as the annealing temperature is increased. It is noted that the pyramid structure on the surface of ZnO nanorod is observed at 850 o C. The intensity of ZnO (002) diffraction peak in X-ray diffraction pattern and intensity of near band edge emission (NBE) peak in photoluminescence (PL) are increased as the ZnO nanorods were annealed at the temperature of 300 o C.

Effects of Doping with Al, Ga, and In on Structural and Optical Properties of ZnO Nanorods Grown by Hydrothermal Method

“…(4). 18 Also, HMT plays a very complicated role in the solution during the hydro- Figure 2(a) shows the XRD patterns acquired from the ZnO, AZO, GZO, and IZO nanorods samples, respectively. The patterns from all the nanorod samples was dominated by the (002) peak of wurtzite-type ZnO, implying that the preferred orientation of the ZnO nanorods was along the (002) direction.…”

“…As already stated vide supra, ZnO seed layers are required for the growth of ZnO nanorods. In our previous study, 18,19,[25][26][27][28] we studied the effect of seed layers on the growth of ZnO nanorods. All the nanorods were hexagonal in shape and were well-grown on the ZnO seed layers.…”

“…18 Among these, hydrothermal methods enables the preparation of ZnO nanorods at much lower temperatures, which makes the process more effective, simplifies the control of dopant concentrations, and allows the use of simple equipment. 19 The preparation of ZnO nanorods by hydrothermal method requires three steps.…”

Влияние Термических И Плазменных Обработок На Фотолюминесценцию Пленок Оксида Цинка

“…Немонотонное поведение интенсивности полосы NBE при термическом отжиге на воздухе с максимумом при ∼ 300−400 • С наблюдалось в ряде работ и объяснялось увеличением степени кристал-личности [11], десорбцией с поверхности гидроксильных групп [12] и примесных атомов, вызывающих безызлуча-тельную рекомбинацию [13].…”

ZnO Nanorods Grown on CdxZn1-xO Seed Layers with Various Cd Mole Fractions

“…In the UV range, a near-band-edge emission (NBE) is generated by the free-exciton (FX) recombination in the ZnO nanorods, but in the visible range, a deep-level emission (DLE) is caused by impurities and structural defects. The green emission at 2.2 eV has been attributed to various types of defects such as oxygen vacancies (V o ), 17 zinc vacancies (V Zn ), 18 oxygen atoms at the zinc position in the crystal lattice (O Zn ), 19 and donor-acceptor pair (DAP). 20 However, the origin is still controversial.…”