氮化镓纳米纤维的静电纺制备及光催化性能研究

Electrospinning Preparation and Photocatalysis Properties of GaN Nanofibers

以聚乙烯吡咯烷酮(PVP)和Ga(NO3)3为前驱体,利用静电纺丝和热处理技术制备了直径在100～300 nm左右的单斜结构的Ga2O3纳米纤维,并通过氨气氮化技术制备了GaN纳米纤维。XRD结果表明GaN样品为六方纤锌矿结构,且最佳氮化温度为850℃,氮化时间为2 h。Raman光谱发生了红移,并再次确定了GaN样品的结构,TGA结果表明GaN纤维在700℃以下在空气和氮气气氛下具有较好的稳定性,SEM和TEM表明纤维直径大约在100～200 nm之间,光催化测试表明GaN纤维对罗丹明6G有很好的降解效果。

Ga203 nanofibers were prepared by electrospinning a precursor mixture of Ga（ NO3 ）3 and PVP, then followed by thermal treatment of the composite, β-Ga=O3 fibers with diameter of about 100-300 nm were obtained. GaN nanofibers were synthesized through nitridation of Ga203 nanofibers in an ammonia atmosphere at high temperatures. XRD patterns showed that all structures of the products were hexagonal Wurtzite, and the best nitridation condition was maintaining the temperature at 850℃ for 2 h. Raman spectroscopy showed a frequency shifted toward infrared region and reconfirmed the structure of synthesized GaN nanofibers. TGA measurement revealed GaN nanofibers had good thermal stability below 700℃ both in air and nitrogen atmosphere. SEM and TEM images revealed the continuous GaN nanofibers had an average diameter of 100-200 nm. The hexagonal GaN fibers exhibited good photocatalytic activity in degradation of Rhodamine-6G.