有序介孔金属氧化物的孔隙结构调控与气敏传感应用
发布时间：2018-07-17 19:31
【摘要】：有序介孔金属氧化物由于具有大的比表面积、丰富的结构孔道特点,在气敏传感器、催化、能源转换与存储等方面有重要的意义。纳米浇筑是采用有序介孔固体为硬模板、有效制备介孔金属氧化物的一种重要方法,金属氧化物在介孔模板的限域孔道中连续生长形成纳米线阵列结构,除去介孔模板后得到有序的介孔金属氧化物,其孔道来源于介孔硬模板均一的孔壁被移除后所产生的空隙,因此孔道结构类型和尺寸分布比较单一,对其实际应用有一定影响。本论文提出通过控制金属氧化物在介孔硬模板孔道里的限域生长,实现对硬模板移除后得到的介孔金属氧化物孔隙结构的有效调控,进而改善其应用性能：1)以硝酸铟为前驱体、有序介孔氧化硅KIT-6为硬模板制备了不同孔隙结构的有序介孔氧化铟：a)KIT-6包含两套独立的螺旋介孔孔道,两套孔道通过孔壁上的尺寸较小的次级孔相连通。氧化铟在KIT-6介孔孔道里的生长依赖于前驱体硝酸铟在孔道里的传输迁移,受到孔壁的限制作用,通常是沿着孔道的方向生长,形成螺旋纳米线；而硝酸铟在孔道里的传输迁移则与KIT-6的孔道连通性(介孔尺寸与次级孔尺寸)有关。我们通过提高(降低)水热合成温度,有效增大(减小)了KIT-6的介孔尺寸和次级孔尺寸。采用不同介孔尺寸和次级孔尺寸的KIT-6为硬模板制备了介孔氧化铟,研究结果表明在特定的条件下会得到具有一个包含小介孔、中介孔和大介孔的多重介孔分布结构的介孔氧化铟；b)除了KIT-6的孔尺寸,还发现硝酸铟填充KIT-6孔体积的比例、填充的次数、热分解硝酸铟时的升温速度都对介孔氧化铟的孔隙结构有影响。2)通过类似的策略,以硝酸锰、硝酸铁为前驱体、有序介孔氧化硅KIT-6为硬模板也制备了不同孔隙结构的有序介孔氧化锰、氧化铁。3)研究了不同孔隙结构的介孔氧化铟对不同气体的气敏性能,发现三介孔氧化铟对甲醛气体在较低工作温度下有较高的敏感度,显著优于其它介孔氧化铟材料。
[Abstract]:Ordered mesoporous metal oxide has important significance in gas sensing, catalysis, energy conversion and storage because of its large specific surface area and rich structure channel characteristics. Nanoplacement is an important method of using ordered mesoporous solid as hard template and effective preparation of mesoporous metal oxide. Metal oxide is in mesoporous template. A nanowire array is formed continuously in the restricted channel, and the mesoporous metal oxide is obtained after removing the mesoporous template. The pore channel is derived from the gap caused by the removal of the pore wall of the mesoporous rigid template. Therefore, the structure type and size distribution of the channel are relatively simple and have some influence on its practical application. The limited field growth of metal oxide in the mesoporous hard template pore is controlled, and the pore structure of mesoporous metal oxides obtained after the hard template removal is effectively controlled, and its application performance is improved: 1) in the precursor of indium nitrate and the ordered mesoporous silica KIT-6 as the hard template, the ordered mesoporous indium oxide with different pore structure is prepared. A): KIT-6 contains two sets of independent spiral mesoporous channels, and two channels are connected through smaller secondary pores on the wall of the hole. The growth of indium oxide in the KIT-6 mesoporous channel depends on the transmission and migration of the precursor indium nitrate in the channel, which is restricted by the pore wall, and usually grows along the channel and forms a spiral nanowire. The transmission and migration of indium nitrate in the channel is related to the pore connectivity of KIT-6 (mesoporous size and secondary pore size). By increasing (reducing) the hydrothermal synthesis temperature, the mesoporous size and secondary pore size of KIT-6 are effectively increased (reduced). The mesoporous oxidation is prepared by using KIT-6 as a hard template with different mesoporous size and secondary pore size. Indium, the results show that a multi pore mesoporous indium oxide containing small mesoporous, medium pore and large mesoporous porous structure will be obtained under specific conditions; b) in addition to the pore size of KIT-6, the proportion of indium nitrate filled KIT-6 pore volume, the number of filling times, and the heating rate of indium in the thermal decomposition of indium nitrate are also found in the mesoporous indium oxide. The pore structure affects.2) through a similar strategy, with manganese nitrate, iron nitrate as precursor, ordered mesoporous silica KIT-6 as a hard template, the ordered mesoporous manganese oxide with different pore structure, iron oxide.3) is used to study the gas sensitive properties of mesoporous indium oxide with different pore structure, and three mesoporous indium oxide is found to be formaldehyde gas. It has a higher sensitivity at lower working temperature and better than other mesoporous indium oxide materials.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.4
本文编号：2130702
[Abstract]:Ordered mesoporous metal oxide has important significance in gas sensing, catalysis, energy conversion and storage because of its large specific surface area and rich structure channel characteristics. Nanoplacement is an important method of using ordered mesoporous solid as hard template and effective preparation of mesoporous metal oxide. Metal oxide is in mesoporous template. A nanowire array is formed continuously in the restricted channel, and the mesoporous metal oxide is obtained after removing the mesoporous template. The pore channel is derived from the gap caused by the removal of the pore wall of the mesoporous rigid template. Therefore, the structure type and size distribution of the channel are relatively simple and have some influence on its practical application. The limited field growth of metal oxide in the mesoporous hard template pore is controlled, and the pore structure of mesoporous metal oxides obtained after the hard template removal is effectively controlled, and its application performance is improved: 1) in the precursor of indium nitrate and the ordered mesoporous silica KIT-6 as the hard template, the ordered mesoporous indium oxide with different pore structure is prepared. A): KIT-6 contains two sets of independent spiral mesoporous channels, and two channels are connected through smaller secondary pores on the wall of the hole. The growth of indium oxide in the KIT-6 mesoporous channel depends on the transmission and migration of the precursor indium nitrate in the channel, which is restricted by the pore wall, and usually grows along the channel and forms a spiral nanowire. The transmission and migration of indium nitrate in the channel is related to the pore connectivity of KIT-6 (mesoporous size and secondary pore size). By increasing (reducing) the hydrothermal synthesis temperature, the mesoporous size and secondary pore size of KIT-6 are effectively increased (reduced). The mesoporous oxidation is prepared by using KIT-6 as a hard template with different mesoporous size and secondary pore size. Indium, the results show that a multi pore mesoporous indium oxide containing small mesoporous, medium pore and large mesoporous porous structure will be obtained under specific conditions; b) in addition to the pore size of KIT-6, the proportion of indium nitrate filled KIT-6 pore volume, the number of filling times, and the heating rate of indium in the thermal decomposition of indium nitrate are also found in the mesoporous indium oxide. The pore structure affects.2) through a similar strategy, with manganese nitrate, iron nitrate as precursor, ordered mesoporous silica KIT-6 as a hard template, the ordered mesoporous manganese oxide with different pore structure, iron oxide.3) is used to study the gas sensitive properties of mesoporous indium oxide with different pore structure, and three mesoporous indium oxide is found to be formaldehyde gas. It has a higher sensitivity at lower working temperature and better than other mesoporous indium oxide materials.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.4
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