Printing Preparation And Application Of Electrochromic System Based On PEDOT:PSS

In recent years,materials,computers,artificial intelligence and other related technologies have developed rapidly.The application of information electronic labels(RFID/NFC labels)and functional material labels(display/sensing labels)in smart packaging products has been discussed as a hot topic by many scholars.The NFC tag is in the passive operating mode,and its coil antenna can generate electric energy to power the NFC chip,which is a kind of green driving mode.In addition,the color changing display label based on PEDOT:PSS has been widely studied due to its advantages such as low working voltage and fast response speed.At the same time,printing technology has become an effective way to realize the deposition of circuits and some functional materials.Therefore,it is of great significance to combine the information electronic label with the functional material label and realize the preparation of electrochronic system by printing.Two substrates(absorbent:kaolin paper silicon anionic paper;Non-absorbable:PET glass),10 wt%of dimethyl sulfoxide(DMSO)or ethylene glycol(EG)doped PEDOT:PSS solution is spun into film as the electrode and chromic layer of color display label,using different solid polymer electrolyte to prepare color display label(electrochromic device).By exploring the influence of different solvent doping on the improvement of PEDOT:PSS film-forming property and electrical conductivity,the optimal doping solvent(namely DMSO)was selected.The electrochemical properties of different solid polymer electrolytes were compared,and the best electrolyte solution S3([ChoCl:Urea=1:1[mol/mol%]]:8501=1:4[w/w%])was selected to prepare electrochromic devices.Finally,the relationship between the substrate absorption characteristics and the performance of color changing display labels is obtainedPEDOT:PSS solution was doped with different solvents(methanol(MeOH)DMSO)to improve its wettability and film formation.Meanwhile,viscosity of PEDOT:PSS solution were investigated.The mechanism of the effects of solvent doping and the addition of gel substance(PVOH)on film forming property was also explored.Acid post-treatment can effectively improve the electrical conductivity of PEDOT:PSS film.The influence of different mass fractions of acid(PTSA),acetic acid(HOAc),oxalic acid(OA))on the electrical conductivity improvement of PEDOT:PSS film and the mechanism of the electrical conductivity improvement were explored.Electrochromic devices with different structures(ECD-G1-L,ECD-G2-L,ECD-G1-V and ECD-G2-V)were prepared with the same electrolyte in different states to investigate the effects of different electrolyte states and device structures on the performance of the electrochromic devices.The experimental results showed that formula F(formula D:PVOH=93:7[w/w%],formula D[PEDOT:PSS]:MeOH=1:1[v/v%])meet the requirements of screen printing film forming,film forming property is good.After treatment with high concentration of organic weak acid(80%EOAc by mass fraction),the electrical conductivity and color performance are almost the same as that of organic medium strong acid(13%PTSA by mass fraction),and the prepared ITO free electrochromic devices are almost the same as the electrochromic devices prepared on ITO in electrochromic performance.In addition,among the four electrochromic devices,ECD-G1-V has the lowest starting voltage(1 V)and the fastest response speed(1-2 s),the corresponding cycle bending performance is poor,not easy to encapsulate.ECD-G2-L has a higher starting voltage(2.5 V)and a slower response(3-4 s),but it is easy to prepare,has good cyclic bending and is easy to encapsulate.The coil antenna with different parameters(line width,shape and number of turns)was designed,and the preparation of the coil antenna was realized by screen printing,and the influencing factors of the performance of the coil antenna were explored.ZnO diode was prepared and modified by PEDOT:PSS to optimize the rectifier characteristics of the diode.The screen printing process was used to realize the printing of the circuit and the preparation of the color changing display lable.Then,the system was completed by connecting the drive system(i.e.,NFC label and diode)and the color changing display label.Considering the VE that can be produced by the coil antenna and the limitation of the preparation process,the optimal parameters of the coil antenna are selected.That is the circular coil with 0.5mm line width and 5 turns.By modified with the organic polymer semiconductor PEDOT:PSS,the diode starting voltage was reduced effectively(1.0 V)and the rectifier ratio was higher(1205.2).Using the above optimal coil antenna parameters and the traditional diode preparation drive system,the color changing display label of ECD-G2-L type was prepared by PEDOT:PSS film processed by HOAc.The electrochromic system was successfully prepared by printing circuit.The information written in the NFC chip was successfully read by using the mobile phone with NFC function and contacting the coil of the driving system.At the same time,the discoloration display label was completely discoloration in about 10 s,realizing the display of information.The color changing system,which is made by green printing process without independent power supply,provides a reliable example for the intellectualization of packaging products...