| Upon rapid development of intelligent electronic devices,many new requirements on portability and wearability are proposed.However,current electronic devices cannot be folded arbitrarily,which is an obstacle on achieving wearability.As an emerging technology,flexible electronics has shown great potentials in future applications in human daily life.Electronic touch screen is an important part of electronic devices for human-computer communication,including display and touch control.Among various advanced flexible transparent conductive materials,Cu nanosilks show their outstanding properties and advantages due to high performance and low cost.Going beyond transparent conductivity and extending the function into autonomous optoelectronic display could open up a new direction on research and development of metal nanosilks materials in the future.According to the above problem,this thesis was carried out with a systematic research work on flexible organic display,flexible touch screen and DUV LED transparent electrodes.Firstly,synthesis of Cu@organic luminescent material(OL)core-shell nanosilks is explored.The residue on the surface of Cu nanosilks is removed by weak acid solution.Then,the polar solvent is found crucial for dispersing OL molecules and driving the nucleate on the side-wall of Cu nanosilks.The core-shell composite of metal/OL material nanosilks are obtained for the first time.Three typical OL materials,which emit green,yellow and blue light,are successfully coated onto the surface of Cu nanosilks to form ultra-fine and flexible the Cu@OL core-shell structure nanosilks.The Cu@OL nanosilks network exhibits obvious luminescent properties,which achieves the integration of metal materials and OL materials at nanoscale.Secondly,synthesis and application of composite Cu nanosilks in low work function.Aiming at the work function matching between pure Cu nanosilks and semiconductor interface,the work function tuning technique for the Cu nanosilks is proposed by coating with low work function metals on sidewall surface.Based on the liquid phase method,Cu@Sc and Cu@Mn nanosilks are synthesized by the one-pot method and the two-step method,respectively.The thickness of the metal shell can be precisely controlled by the molar ratio of precursors.The results of experiment and simulation show that the Cu@Mn nanosilks form ohmic contact to the n-type semiconductors and Cu@Mn nanosilks have excellent optoelectronic performances of T=90.1%and Rs=42 Ω/sq in the DUV region.In addition,high-quality Cu@Sc2O3 nanosilks have been obtained by oxidizing the Sc shell.Low work function as well as electrochemical ability has been obtained at the same time.Thirdly,technique of sonication-spray printing of Cu nanosilks and transparent flexible touch screen.Combining the liquid phase method and continuous synthesis technology,we obatined high-quality and meanwhile high-yield of Cu nanosilks.A sonication-spray printer system is designed to rapidly transfer nanosilks on any rigid or flexible substrates in large area.The performance reaches Rs=52 Ω/sq at T>90%.The resistive flexible touch screen is fabricated using PET/Cu nanosilks conductive films,which achieves smooth writing and precise control on flat state and also on curved state.On the other hand,the Cu nanosilks can be transferred on ZnO nanorods array uniformly,which are used as the electrode for UV detector.Similarly,Cu nanosilks are spray-coated on other substrates such as MXene,hydrogel,melt blown fabric and nonwoven fabric uniformly,which can be applied in various wearable sensors and antibacterial products.The above research results provide important supports on the synthesis and applications of composite Cu nanosilks.It is significant to push the research and development of novel devices on flexible electronics in the future. |
