氮掺杂石墨烯-四氧化三铁的制备.doc

工学硕士学位论文
氮掺杂石墨烯-四氧化三铁的制备及催化性能研究
氮掺杂石墨烯-四氧化三铁的制备及催化性能研究
摘要
石墨烯是一种新型纳米材料,它独特的结构使其具有卓越的电学性能和物理性能,例如:高比表面积、高导热性、超高载流子迁移率、以及超强的杨氏模量,并广泛应用在纳米电子学、电子传感器、晶体管、太阳能电池、催化剂等多种领域。但石墨烯没有带隙、较为惰性、不易与其他材料复合。针对石墨烯的这些缺点,向石墨烯中引入氮原子。掺杂了氮原子的石墨烯可以改变其电子结构,并打开石墨烯的带隙,从而使其具有更广泛的应用价值。
本文首先采用水热法合成氮掺杂石墨烯,分别以氨水、甲酰胺、尿素、水合肼为氮源与氧化石墨烯反应,并通过调控反应条件,得到氮掺杂量最高的反应条件,即为:氨水为氮源、氧化石墨与氨水的比例1:39、为反应温度为160℃、反应时间为12小时,%。
本文成功的利用水热法,一步反应生成氮掺杂石墨烯-四氧化三铁复合材料。利用乙二醇为还原剂、氨水为氮源、氯化铁为铁源、聚乙烯吡咯烷酮(PVP)为分散剂,在反应温度为200℃、反应时间为12小时下,成功的合成了氮掺杂石墨烯-四氧化三铁。利用红外光谱,X射线衍射光谱(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)等手段对制备的复合材料进行表征分析。
将制备出的氮掺杂石墨烯-四氧化三铁复合材料作为催化剂,验证其催化性能。以甲苯为原料,双氧水为氧化剂,在不同反应条件下进行氧化反应,并利用气相色谱分析其产物,计算甲苯转化率,各产物选择性。
关键词氮掺杂;石墨烯;磁性;催化剂
Synthesis and catalytic properties study of nitrogen-doped graphene-Fe3O4
Abstract
Graphene is a new type nano-material, its unique structure makes it has excellent electrical and physical properties, such as: high specific surface area, high thermal conductivity, high carrier mobility, super Young's modulus and widely used in many fields of nanoelectronics, electronic sensors, transistors, solar cells, catalysts. But there is no band gap in graphene, and graphene is relatively inert ,not easy posite with other materials. In response to these ings of graphene, graphene is introduced to the nitrogen atoms. Doped with nitrogen atoms in graphene can change its electronic structure, and open the band gap of graphene, making it have more extensive application value.
In this paper, firstly, nitrogen doped graphene generated by hydrothermal method,  respectively with ammonia, urea, formamide and hydrazine hydrate as the nitrogen source and graphene oxide reaction, through regulating the reaction conditions, to obtain  the highest amount of nitrogen doping reaction conditions, namely as follows: ammonia as nitrogen oxide, the ratio of graphite oxide and ammonia is 1:39, the reaction temperature was 160 ℃, the reaction time was 12 hours, then a atoms percentage of the nitrogen-doped i