金纳米颗粒等离激元对不同形貌氧化锌薄膜发光性能的调控

采用化学气相沉积法制备了纳米棒状的氧化锌纳米结构薄膜和没有纳米棒的氧化锌薄膜,通过直流溅射在所制备的有纳米棒和没有纳米棒的氧化锌薄膜上淀积约3 nm厚的金纳米颗粒薄膜,研究了金纳米颗粒对不同表面形貌氧化锌薄膜的发光特性的影响。实验发现金纳米颗粒的存在使具有纳米棒的氧化锌薄膜的紫外发射增强,但使来自缺陷的可见光发射受到很大的抑制。通过比较有纳米棒和没有纳米棒的氧化锌薄膜在镀金纳米颗粒前后的发光特性,发现金表面等离激元对氧化锌发光的调控取决于氧化锌的表面形貌,纳米棒的存在更有利于金纳米颗粒等离激元调控氧化锌的发光特性。

Tunable Photoluminescence of ZnO Films with Different Surfaces by The Coating of Au Nanoparticels

ZnO films with and without nanorods on the surfaces were prepared by a chemical vapor deposition technique. Au nanoparticles were deposited on the surfaces of ZnO films with and without nanorods by the direct circuit sputtering method. Photoluminescence of the ZnO film with nanorods is tuned by the surface modification of the surface plasmons. Comparing with the ZnO film without nanorods, the near band gap emission from the ZnO film with nanorods is greatly enhanced and visible emission from defects is significantly suppressed. This phenomenon is attributed to the efficient coupling of surface plasmon resonance of Au nanoparticle with ZnO nanorods and the transfer of high energy electrons in Au nanoparticles to conduction band of ZnO.