有序介孔金屬氧化物的孔隙結(jié)構(gòu)調(diào)控與氣敏傳感應(yīng)用
發(fā)布時間：2018-07-17 19:31
【摘要】：有序介孔金屬氧化物由于具有大的比表面積、豐富的結(jié)構(gòu)孔道特點,在氣敏傳感器、催化、能源轉(zhuǎn)換與存儲等方面有重要的意義。納米澆筑是采用有序介孔固體為硬模板、有效制備介孔金屬氧化物的一種重要方法,金屬氧化物在介孔模板的限域孔道中連續(xù)生長形成納米線陣列結(jié)構(gòu),除去介孔模板后得到有序的介孔金屬氧化物,其孔道來源于介孔硬模板均一的孔壁被移除后所產(chǎn)生的空隙,因此孔道結(jié)構(gòu)類型和尺寸分布比較單一,對其實際應(yīng)用有一定影響。本論文提出通過控制金屬氧化物在介孔硬模板孔道里的限域生長,實現(xiàn)對硬模板移除后得到的介孔金屬氧化物孔隙結(jié)構(gòu)的有效調(diào)控,進而改善其應(yīng)用性能：1)以硝酸銦為前驅(qū)體、有序介孔氧化硅KIT-6為硬模板制備了不同孔隙結(jié)構(gòu)的有序介孔氧化銦：a)KIT-6包含兩套獨立的螺旋介孔孔道,兩套孔道通過孔壁上的尺寸較小的次級孔相連通。氧化銦在KIT-6介孔孔道里的生長依賴于前驅(qū)體硝酸銦在孔道里的傳輸遷移,受到孔壁的限制作用,通常是沿著孔道的方向生長,形成螺旋納米線；而硝酸銦在孔道里的傳輸遷移則與KIT-6的孔道連通性(介孔尺寸與次級孔尺寸)有關(guān)。我們通過提高(降低)水熱合成溫度,有效增大(減小)了KIT-6的介孔尺寸和次級孔尺寸。采用不同介孔尺寸和次級孔尺寸的KIT-6為硬模板制備了介孔氧化銦,研究結(jié)果表明在特定的條件下會得到具有一個包含小介孔、中介孔和大介孔的多重介孔分布結(jié)構(gòu)的介孔氧化銦；b)除了KIT-6的孔尺寸,還發(fā)現(xiàn)硝酸銦填充KIT-6孔體積的比例、填充的次數(shù)、熱分解硝酸銦時的升溫速度都對介孔氧化銦的孔隙結(jié)構(gòu)有影響。2)通過類似的策略,以硝酸錳、硝酸鐵為前驅(qū)體、有序介孔氧化硅KIT-6為硬模板也制備了不同孔隙結(jié)構(gòu)的有序介孔氧化錳、氧化鐵。3)研究了不同孔隙結(jié)構(gòu)的介孔氧化銦對不同氣體的氣敏性能,發(fā)現(xiàn)三介孔氧化銦對甲醛氣體在較低工作溫度下有較高的敏感度,顯著優(yōu)于其它介孔氧化銦材料。
[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.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.4
本文編號：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.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.4
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