The effect of seed layer on morphology of ZnO nanorod arrays grown by hydrothermal method

Tao, Yingjie; Fu, Ming; Zhao, Ailun; He, Dawei; Wang, Yongsheng

doi:10.1016/j.jallcom.2009.09.020

Cited by 114 publications

(68 citation statements)

References 18 publications

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“…而制备 ZnO 种子层的方法有多种, 主要包括射频磁控溅射法 [26] 、脉冲激光沉积法 [27] 、电沉积法 [8] Figure 1 Top-view SEM images of ZnO nanowire arrays prepared by two-step hydrothermal method [15] (a) ZnO seed layer from the thermal decomposition of zinc acetate dihydrate, (b) seed layer from the dip-coating of preformed ZnO nanocrystals…”

Section: 种子层mentioning

confidence: 99%

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

Hao¹,

Deng²,

Yang³

et al. 2014

Acta Chim. Sinica

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The quality of zinc oxide (ZnO) nanowire/rod arrays determines the performance of the constructed photoelectric devices. In order to prepare high-quality ZnO nanowire/rod arrays with greater surface to volume ratio, better verticality and separate roots, a brief summary has been made about the research progress of the controllable preparation of ZnO nanowire/rod arrays using two-step hydrothermal method in this paper. Moreover, how the seed layer, growth solution and preparation method influence their morphology has been discussed respectively, and the mechanisms of ammonia, hexamethylenetetramine and polyethyleneimine in promoting the growth of nanowire/rod arrays have been particularly analyzed. At the same time, the method of controllable preparation of ZnO nanowire arrays based on microfluidic technique has been put forward, which can improve the growth efficiency of nanowire arrays. Finally, an introduction has been made about how the morphology of ZnO nanowire/rod arrays plays an important role in improving the performance of dye-sensitized solar cells, nanogenerators, gas sensors and field emission devices, and an outlook of future development trend of two-step hydrothermal method in preparing ZnO nanowire/rod arrays is also provided.

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Section: 种子层mentioning

confidence: 99%

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

Hao¹,

Deng²,

Yang³

et al. 2014

Acta Chim. Sinica

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“…Liquid-phase techniques such as hydrothermal and electrochemical processes have been widely used to grow ZnO structures on ZnO-seeded substrates [7,11,17,[19][20][21], catalyzed substrates [22], or seed/catalyst-free substrates [14,19,21,23]. Generally, the grown ZnO structures on the ZnO-seeded substrates are mostly in the form of onedimensional (1D) nanostructures [7,9,20,21,24,25] due to the nature of chemical reaction of liquid-phase techniques and also due to the small grains and rough surfaces of ZnO seed layers prepared by the sputtering method [7,20,21] or other deposition techniques [9,24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the grown ZnO structures on the ZnO-seeded substrates are mostly in the form of onedimensional (1D) nanostructures [7,9,20,21,24,25] due to the nature of chemical reaction of liquid-phase techniques and also due to the small grains and rough surfaces of ZnO seed layers prepared by the sputtering method [7,20,21] or other deposition techniques [9,24,25]. Song et al presented the effects of a seed layer prepared by the sputtering method on the growth of ZnO NRs [17].…”

Section: Introductionmentioning

confidence: 99%

High electron mobility and low carrier concentration of hydrothermally grown ZnO thin films on seeded a-plane sapphire at low temperature

Jayah¹,

Yahaya²,

Mahmood³

et al. 2016

Nano Online

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Hydrothermal zinc oxide (ZnO) thick films were successfully grown on the chemical vapor deposition (CVD)-grown thick ZnO seed layers on a-plane sapphire substrates using the aqueous solution of zinc nitrate dehydrate (Zn(NO 3 ) 2 ). The use of the CVD ZnO seed layers with the flat surfaces seems to be a key technique for obtaining thick films instead of vertically aligned nanostructures as reported in many literatures. All the hydrothermal ZnO layers showed the large grains with hexagonal end facets and were highly oriented towards the c-axis direction. Photoluminescence (PL) spectra of the hydrothermal layers were composed of the ultraviolet (UV) emission (370 to 380 nm) and the visible emission (481 to 491 nm), and the intensity ratio of the former emission (I UV ) to the latter emission (I VIS ) changed, depending on both the molarity of the solution and temperature. It is surprising that all the Hall mobilities for the hydrothermal ZnO layers were significantly larger than those for their corresponding CVD seed films. It was also found that, for the hydrothermal films grown at 70°C to 90°C, the molarity dependences of I UV /I VIS resembled those of mobilities, implying that the mobility in the film is affected by the structural defects. The highest mobility of 166 cm 2 /Vs was achieved on the hydrothermal film with the carrier concentration of 1.65 × 10 17 cm −3 grown from the aqueous solution of 40 mM at 70°C.

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“…To solve this problem, homogeneous ZnO thin layers have been widely used as seed layers. 6 The crystallinity of the ZnO nanostructures is greatly affected by crystal quality and surface morphology of seed layers.…”

Section: Introductionmentioning

confidence: 99%

ZnO Nanorods Grown on Cd_xZn_1-xO Seed Layers with Various Cd Mole Fractions

Kim¹,

Kim²,

Yim³

et al. 2012

Bulletin of the Korean Chemical Society

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ZnO nanorods were grown on the CdxZn1-xO seed layers with various Cd mole fractions by hydrothermal method. The effects of the Cd mole fraction for CdxZn1-xO seed layers on the structural and optical properties of the ZnO nanorods were investigated by scanning electron microscopy, X-ray diffraction, and photoluminescence. The narrowest full-width at half-maximum and largest grain size of the CdxZn1-xO seed layers, indicating improvement in crystal quality, were observed at the Cd mole fraction of 0.5. At the Cd mole fraction of 0.5, the largest enhancement in the density, the crystal quality, and the growth rate of the ZnO nanorods was observed while their appearance was not affected significantly by the incorporation of the Cd in the CdxZn1-xO seed layers. Consequently, the luminescent properties of the ZnO nanorods were enhanced. The largest improvement in the structural and optical properties of the ZnO nanorods was observed at the Cd mole fraction of 0.5.

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The effect of seed layer on morphology of ZnO nanorod arrays grown by hydrothermal method

Cited by 114 publications

References 18 publications

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

High electron mobility and low carrier concentration of hydrothermally grown ZnO thin films on seeded a-plane sapphire at low temperature

ZnO Nanorods Grown on Cd_xZn_1-xO Seed Layers with Various Cd Mole Fractions

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The effect of seed layer on morphology of ZnO nanorod arrays grown by hydrothermal method

Cited by 114 publications

References 18 publications

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

Research Progress in Preparation and Applications of ZnO Nanowire/rod Arrays by Hydrothermal Method

High electron mobility and low carrier concentration of hydrothermally grown ZnO thin films on seeded a-plane sapphire at low temperature

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

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ZnO Nanorods Grown on Cd_xZn_1-xO Seed Layers with Various Cd Mole Fractions