Chen T, Xing G Z, Zhang Z, Chen H Y, Wu T
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Nanotechnology. 2008 Oct 29;19(43):435711. doi: 10.1088/0957-4484/19/43/435711. Epub 2008 Sep 22.
Rational design of hybrid nanostructures through attaching nanowires with nanoparticles is an effective route to enhance the existing functionalities or to explore new ones. We carry out a systematic investigation on the photoluminescence of ZnO nanowire-Au nanoparticle hybrid nanostructures synthesized by attaching Au nanoparticles onto ZnO nanowires. Citrate-stabilized 40 nm Au nanoparticles effectively quench the green emission and enhance the UV emission of the ZnO nanowires, which is consistent with the wavelength-dependent generation of surface plasmon. The UV/green emission intensity ratio could be reversibly and reproducibly tailored by attaching/detaching Au nanoparticles. This enhancement of UV emission diminishes if the Au nanoparticles are coated with a polymer layer. We also find that the orange-red emission of the ZnO nanowires is related to the excess oxygen on the ZnO surface, and it is also tunable via annealing and surface modifications.
通过将纳米线与纳米颗粒连接来合理设计混合纳米结构是增强现有功能或探索新功能的有效途径。我们对通过将金纳米颗粒附着到氧化锌纳米线上合成的氧化锌纳米线-金纳米颗粒混合纳米结构的光致发光进行了系统研究。柠檬酸盐稳定的40纳米金纳米颗粒有效地猝灭了氧化锌纳米线的绿色发射并增强了其紫外发射，这与表面等离子体的波长依赖性产生相一致。通过附着/分离金纳米颗粒，可以可逆且可重复地调整紫外/绿色发射强度比。如果金纳米颗粒涂覆有聚合物层，这种紫外发射的增强就会减弱。我们还发现氧化锌纳米线的橙红色发射与氧化锌表面的过量氧有关，并且它也可以通过退火和表面改性来调节。
