溶胶-凝胶法制备氧化锌/石墨烯薄膜和退火温度对其光致发光的影响

Effect of annealing temperature on Photoluminescence of ZnO/Graphene nano-films deposited by sol-gel method

摘要:

在铜衬底通过低压化学汽相淀积(LPCVD)和溶胶-凝胶法直接制备氧化锌/石墨烯纳米薄膜。分析退火温度对其结构、形态、化学状态和成份、光学性能的影响。XRD表明,氧化锌/石墨烯纳米结构表现出六方纤锌矿结构,晶体质量随退火温度从500℃到700℃的增加而提高。当退火温度达到700℃时,SEM显示,氧化锌薄膜呈现出颗粒均匀密集、表面光滑。其薄膜的平均颗粒尺寸约为35.7 nm。PL测量显示,退火温度为700℃时,氧化锌/石墨纳米薄膜具有较好的光学性能,这是因为样品的结晶质量较高且缺陷密度较低。

Abstract:

ZnO/Graphene nano-films were directly prepared on Cu substrate via a low pressure chemical vapor deposition (LPCVD) and sol-gel method. The effects of the annealing temperature on the structural, morphology, the chemical state and component, and optical property of these ZnO/Graphene nano-films were investigated. The XRD patterns demonstrate that the ZnO/Graphene nanostructures exhibit the hexagonal wurtzite structure and the crystalline quality increases with increasing the annealing temperatures from 500 to 700 ℃. When the annealing temperature reaches at 700 ℃, SEM analysis shows that sample ?lm exhibits dense and uniform grains and smooth surface and the average grain size of film deposited 3 layers is about 35.7 nm. The PL measurement confirms that ZnO/Graphene nano-film deposited 3 layers at the annealing temperatures of 700℃ has an better optical performance, which due to the higher crystalline quality and lower defect concentration.