ZnO plates synthesized from the ammonium zinc nitrate hydroxide precursor
ZnO plates synthesized from the ammonium zinc nitrate hydroxide precursor
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DOI：
10.1039/c1ce05805c
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发表时间：
2012-01-01
期刊：
影响因子：
3.1
通讯作者：
Zou, Zhigang
中科院分区：
文献类型：
--
作者：
Wan, Lijuan;Wang, Xiangyan;Zou, Zhigang
以一种新的前驱体硝酸锌铵（NH 4 Zn 3（OH）（6）NO3）为原料，在聚苯乙烯磺酸钠（PSS）的辅助下，通过溶剂热法合成了ZnO组装的六方或多孔矩形片。采用XRD、BET比表面积测量、SEM、HRTEM和TG-DSC等手段对产物进行表征，并对产物的相转变进行了研究。我们的研究结果表明，氧化锌片的形态是强烈依赖于前体的分解过程。通过直接加热NH 4 Zn 3（OH）（6）NO3，前驱体发生热分解，得到多孔ZnO片。然而，在溶剂热反应下使用相同的前体，最终产物是六方ZnO片。提出了不同合成路线形成的ZnO片晶的生长机理。研究了不同形貌ZnO的光致发光和光催化性能。多孔ZnO板显示出三个发射峰，这可能是由其微观结构和缺陷中心引起的，多孔ZnO对CO2的光催化还原表现出更好的光催化活性。
ZnO assembled hexagonal or porous rectangular plates were synthesized from the decomposition of a new precursor, ammonium zinc nitrate hydroxide (NH4Zn3(OH)(6)NO3), through a facile solvothermal route assisted by Poly(styrene sulfonic acid) sodium salt (PSS). XRD, BET surface area measurements, SEM, HRTEM and TG-DSC were used to describe the as-prepared products and understand the phase transformation. Our results indicate that the morphology of the ZnO plates is dependent strongly on the decomposition process of the precursor. By directly heating NH4Zn3(OH)(6)NO3, porous ZnO plates were obtained due to the thermal decomposition of the precursor. Using the same precursor under the solvothermal reaction, however, the final product is hexagonal ZnO plates. The growth mechanism of ZnO plates formed in different synthetic routes was proposed. Photoluminescence (PL) and photocatalytic properties of the as-prepared ZnO with different morphologies were studied. Porous ZnO plates showed three emission peaks, which may be induced by its microstructure and defect centres, and the porous ZnO showed the improved photocatalytic activity for photoreduction of CO2.