Preparation of ZnO nanoparticles in a reverse micellar system and their photoluminescence properties.
Preparation of ZnO nanoparticles in a reverse micellar system and their photoluminescence properties.
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DOI：
10.1016/j.jcis.2004.09.069
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发表时间：
2005-04
影响因子：
9.9
通讯作者：
T. Hirai;Y. Asada
中科院分区：
文献类型：
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作者：
T. Hirai;Y. Asada
在聚乙二醇单-4-壬基苯基醚(NP-5)/环己烷反胶束体系中，通过原位聚合六亚甲基二异氰酸酯（HDI）将Zn(OH)2纳米粒子煅烧制备出球状、粒径分布窄的ZnO纳米粒子，并与聚脲（PUA）结合。制备的ZnO纳米粒子具有近紫外发射和绿色发射，其强度比与煅烧条件有关。对于所研究的纳米颗粒，煅烧气氛显著影响ZnO纳米颗粒的光致发光性能，如近紫外发射与绿色发射的强度比，而不是尺寸，形态和结晶度。与在空气中煅烧的情况相比，在o2流中煅烧的绿色排放量降低，而在n2流中煅烧的绿色排放量增加。这一发现表明，随着ZnO纳米粒子氧空位数量的增加，绿色发射增强，从而在不改变纳米粒子尺寸和形貌的情况下，通过煅烧条件成功地控制了纳米粒子的光致发光性能。
ZnO nanoparticles with spherical morphology and narrow size distribution were obtained by calcination of Zn(OH)2nanoparticles, which were prepared in a polyethylene glycol mono-4-nonylphenyl ether (NP-5)/cyclohexane reverse micellar system and incorporated into polyurea (PUA) via an in situ polymerization of hexamethylene diisocyanate (HDI). The resulting ZnO nanoparticles demonstrated a near-UV emission and a green emission, the intensity ratio of which depended on calcination conditions. For the nanoparticles studied, the calcination atmosphere influenced remarkably the photoluminescence properties such as intensity ratio of the near-UV emission to green emission, rather than the size, morphology, and crystallinity of the ZnO nanoparticles. The green emission decreased by calcination in O2flow but increased by calcination in N2flow, as compared with the case calcined in air flow. This finding suggests that the green emission is enhanced with the increase of the number of oxygen vacancies of the ZnO nanoparticles and thus the photoluminescence properties of the nanoparticles were successfully controlled by the calcination condition, without changing the size and morphology.