Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property.
Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property.
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DOI：
10.1016/j.jallcom.2017.01.273
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发表时间：
2017-04-25
影响因子：
6.2
通讯作者：
Summers CJ
中科院分区：
文献类型：
--
作者：
Kurudirek SV;Pradel KC;Summers CJ
以氢氧化铵和聚乙烯亚胺作为添加剂添加到传统的基于硝酸盐的合成路线中，对氧化锌纳米棒（NRs）的水热合成进行了研究，以获得排列良好、超高密度和超长纳米结构的薄膜。在一次生长循环中获得了长度超过60μm的氧化锌纳米棒，通过两次生长循环获得了长度约为100μm的纳米棒。在所有样品中，纳米棒的长度在基底上均匀分布，并且观察到了高密度的纳米棒阵列。这些条件是通过仔细研究该材料体系的成核和生长动力学而获得的，使得溶液的过饱和度仅通过在结晶氧化锌上以及在其存在下沉淀而降低，并且由于聚乙烯亚胺（PEI）的螯合作用以及六亚甲基四胺（HMTA）的产物而利用了第二个生长阶段。此外，生长行为与溶液的pH值相关。发现结构和光学数据支持生长条件。生长态的超长氧化锌纳米棒的光致发光（PL）光谱显示出一个强而宽（580 - 625nm）的可见光发射峰。然而，在623K（350°C）的成形气体气氛中退火后，显示出的光致发光光谱在可见光发射方面显著降低，而在379nm处的近带隙紫外发射增加。因此，与添加氢氧化铵和聚乙烯亚胺相关的机制为在低温（即368K（95°C））下合成超长且密集的氧化锌纳米棒阵列提供了一种简单的途径。
The hydrothermal synthesis of ZnO nanorods (NRs) has been investigated using ammonium hydroxide and polyethyleneimine as additives to the conventional nitrate based synthesis route, to obtain thin-films of well-aligned, ultradense and ultralong nanostructures. ZnO NRs longer than 60 μm were obtained in a one-cycle growth run and rod lengths ~ 100 μm by a two-cycle growth. The lengths of the rods were distributed uniformly across the substrate in all samples and highly dense NR arrays were observed. These conditions were obtained by a careful review of the nucleation and growth kinetics for this material system, such that the supersaturation of the solution was only relieved by precipitation on and in the presence of crystalline ZnO, and by the exploitation of a second growth phase due to the chelating behave of PEI and the products of HMTA. Also, the growth behavior was correlated to the solution pH values. The structural and optical data were found to be supportive of the growth conditions. The photoluminescence (PL) spectra from as-grown ultralong ZnO NRs exhibited a strong broad (580–625 nm) visible emission peak. However, annealing in a forming gas atmosphere at 623K (350°C) revealed a PL spectrum with a significantly decreased visible emission and an increased near band gap UV emission at 379 nm. Thus, the mechanisms associated with ammonium hydroxide and PEI addition provide a simple route for synthesizing ultralong and dense arrays of ZnO NRs at low temperature i.e. 368K (95°C).
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影响因子：
8.6
作者：
Kuo, Tz-Jun;Lin, Chun-Neng;Huang, Michael H.
通讯作者：
Huang, Michael H.
影响因子：
2.1
作者：
Cembrero, J;Elmanouni, A;Marí, B
通讯作者：
Marí, B
影响因子：
4
作者：
Hsu, J. W. P.;Tallant, D. R.;Copeland, R. G.
通讯作者：
Copeland, R. G.
水热法合成ZnO多级结构及其光致发光性能
影响因子：
6.2
作者：
Huang, Peng;Zhang, Xin;Feng, Boxue
通讯作者：
Feng, Boxue
DOI：
10.1016/j.nima.2006.09.041
发表时间：
2006-12-01
影响因子：
1.4
作者：
Neal, J. S.;Boatner, L. A.;Bourret-Courchesne, E. D.
通讯作者：
Bourret-Courchesne, E. D.