Assembly And Applications Of Functional Nanomaterials

In recent years,nanomaterials have been widely used in fields such as lighting,catalysis,environmental testing,and biomedicine due to their unique size and functions.As a nanotechnology method,assembly can not only achieve the regulation of nanomaterials'morphology,but also play an important role in improving the performance and enriching the functions of nanomaterials.The heat generated by QLED devices can cause the lattice expansion and growth of the nanoparticles,which will lead to their red shift of luminous color.In 2^nd Chapter,we used CdSeTe alloy nanoparticles as building blocks to prepare CdSeTe needle-like self-assemblies.The temperature-sensitivity of the CdSeTe alloy nanoparticles can be reduced by changing the ratio of Se/Te and the thermal stability can be further improved by assembling.Compared to traditional semiconductor nanoparticles,the self-assemblies have excellent thermal stability,and their fluorescence emission peak won't change even heated at 170°C.Finally,we mixed CdSeTe self-assemblies with PDMS and used as the color conversion layer to prepare LED devices with excellent thermal stability.When the WLED is prepared by blending different fluorescent color materials,the obtained spectrum will have a significantly red shift compared to the theoretical spectrum due to the FRET effect.In 3^rd Chapter,we use CdTe nanoparticles as building blocks and prepare CdTe superparticles with the size of several hundred nanometers by two-step phase transfer.Due to the steric hindrance and electrostatic repulsion of the superparticles,the distance between adjacent superparticles is above 10 nm.Thereby effectively avoiding the spectral redshift caused by the FRET effect.Finally,CdTe superparticles with different emission are blended according to a predetermined ratio as the color conversion layer of the LED.The prepared WLED with a high CRI completely matches the theoretical spectrum.Since self-assembling materials can inherit the properties of their building blocks,assembling different nanomaterials can effectively expand and enrich their functions.In 4^th Chapter,we use BiVO₄ and Fe₃O₄ nanoparticles as building blocks to prepare BiVO₄/Fe₃O₄ superparticles by self-assembling.The surface is then coated with a PDA shell.The prepared BiVO₄/Fe₃O₄@PDA composite superparticles not only inherit the high X-ray absorption properties from BiVO₄,but also obtained the magnetic and near-infrared light absorption properties from Fe₃O₄.What's more,the PDA shell improves the biocompatibility and near-infrared light absorption of the composite superparticles.All these designs make BiVO₄/Fe₃O₄@PDA composite superparticles have both the tumor synergy therapy function of RT/PTT and the multi-mode imaging performance of CT/MRI/PA.Experiments show that BiVO₄/Fe₃O₄@PDA composites superparticles have excellent biological safety.The synergistic effect of BiVO₄/Fe₃O₄@PDA composite superparticles is significantly better than any single treatment,which fully demonstrates the advantages of synergistic therapy and its application prospects.