摘要
为了探讨TiO2/氧化石墨烯纳米复合物的制备技术及产物结构的变化规律,采用微波法将钛酸丁酯引入季铵盐/氧化石墨插层复合物的层间域内,钛酸丁酯经原位水解在氧化石墨层间生成Ti(OH)4,再经焙烧处理制备TiO2/氧化石墨烯纳米复合物。采用XRD、SEM、FTIR和XPS对原料和不同阶段生成的产物的结构及变化、微观形貌、氧化官能团特征和化学键特点进行表征。结果表明,钛酸丁酯在原位水解过程中将氧化石墨剥离为氧化石墨烯;TiO2/氧化石墨烯纳米复合物中锐钛矿型TiO2的形成温度比纯TiO2的提高了约100℃;TiO2/氧化石墨烯纳米复合物中的TiO2和纯TiO2的平均晶粒尺寸都随焙烧温度的升高而增大,但前者的平均晶粒尺寸均小于相同温度焙烧处理的纯TiO2的;在TiO2/氧化石墨烯纳米复合物中氧化石墨烯与TiO2之间形成Ti-O-C键,并抑制了锐钛矿型TiO2的形成,而氧化石墨烯作为阻隔层则阻碍了锐钛矿晶粒的长大。
Abstract： To investigate the preparation and structural variation laws of TiO2/Graphene Oxide, the tetrabutyl titanate was inserted and hydrolyzed to Ti（ OH）4 in the interlayer space of CTAB/Graphite oxide intercalation compounds by microwave irradiation heating method. After calcination process, the TiO2/Graphene oxide nano-composite was prepared. The structural variation, micro-morphology, functional groups and chemical bonding of raw material and products were characterized by XRD, SEM, FTIR and XPS. The results show that graphite oxide was exfoliated to graphene oxide during the in situ hydrolysis of tetrabutyl titanate. The crystallization temperature of TiO/in the TiO2/Graphene oxide nano- composite increased about 100 ℃ against the pure TiO2 sample. It is also found that the average crystal size of TiO2 in the nano-composite and the pure sample were both enlarged with the increase of calcinations temperature. However, under the same calcinations temperature, the average crystal size of TiO2 in TiO2/Graphene oxide nano-composite was smaller than that of the pure one. It was proved that the newly formation of Ti-O-C bond between TiO2 and graphene oxide effectively frustrated the crystallization and the growth of TiO2 crystalline.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第1期180-187,共8页
Journal of Synthetic Crystals
基金
国家自然科学基金(41272051)
西南科技大学博士基金(11ZX7135)
