草酸
煅烧
六亚甲基四胺
草酸盐
化学工程
材料科学
锌
热重分析
选择性
扫描电子显微镜
氢氧化物
吸附
热液循环
透射电子显微镜
多孔性
比表面积
纳米技术
无机化学
化学
催化作用
有机化学
复合材料
冶金
工程类
作者
Jiashan Cui,Jianbo Sun,Xin Liu,Jinwei Li,Xinzhi Ma,Tingting Chen
标识
DOI:10.1016/j.apsusc.2014.03.155
摘要
ZnO materials with porous and hierarchical flower-like structure were synthesized through mild hydrothermal and simple calcination approach, in which the flower-like layered zinc oxalate hydroxide (ZnC2O4·3Zn(OH)2) precursor was first synthesized and then calcined at 600 °C. The obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopic (TEM), Brunauer–Emmett–Teller (BET) and thermogravimetric (TG) analysis. We proposed the possible growth mechanism of the material via studying the time evolution experiment results. In the process of reaction, oxalic acid as a structure-directing agent hydrolyzed and then formed primarily sheets-like intermediate ZnC2O4·2H2O. Hexamethylenetetramine (HMT) as surfactant, with directional adsorption, leads to the formation of layered zinc oxalate hydroxide precursor. Furthermore, the gas sensitivity also can be characterized, whose results indicated that the synthesized materials had a preferable selectivity to ethanol gas. The fast response rate and reversible performance can be attributed to the produced greater specific surface area produced, which was caused by the porous and hierarchical flower-like structure.
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