Nearly monodispersed perylene nanotablets: Easy fabrication and unique optical properties

Here we describe a simple physical vapor deposition (PVD) method to prepare large quantity of highly monodispersed perylene nanotablets with a deposition-temperature controlled approach. The nanotablets produced are 1 μm octagon with 100-200 nm thickness. Confocal microscopic images of the nanotablets excited with a UV light show not only yellow color emission which is quite different from perylene monomers but also the obvious light-wave guiding properties. The formation of β form nanocrystals shows that our method is highly selective for only one kind of perylene nanocrystals, which makes sure the uniform optical and electronic properties of the whole thin film. The morphology of the unique perylene nanotablets is significantly decided by the strictly required temperature of the depositing substrates. This approach is simple and template free and the as-prepared nanotablets possess smooth surface. The coating of the nanotablets can change the superhydrophilic surface to a superhydrophobic one which is an important application property for fabricating stable nanodevices.