Interface Synthesis And Characterization Of Two-dimensional Conjugated Polymers

In recent years,organic two-dimensional conjugated polymers(2DCPs)have attracted extensive attention due to their unique physicochemical properties and related applications in electronics,catalysis,energy storage etc.Despite the current progress,most of the synthesized 2DCPs have uncontrollable morphology,structure and thickness,which greatly hindered their fundamental research and application.We have successfully developed several general methods for growing 2DCPs at the interface and explored their applications in organic optoelectronics.The main content of this paper can be divided into the following three parts:1.We present a new 2DCP,named as 2D polytriethyltriindole(2DPTTI),effectively synthesized by interfacial Suzuki reaction on toluene-water interfaces from 2,7,12-tribromo-5,10,15-triethyltriindole(2-Br TTI)and 1,4-benzenediboronic acid dipinacol ester(BADE)precursors at room temperature.The Organic field effect transistors(OFETs)were fabricated based on 2DPTTI films and exhibited typical p-type semiconducting property.This result provides a general approach for constructing various semiconducting 2DCPs.2.The ultrathin 2DPTTI film was efficiently synthesized from 2-Br TTI and BADE precursors via Suzuki reaction on air-water interfaces.The 2DPTTI films used as active layer in OFETs exhibited typical p-type semiconducting property,and superior UV optoelectronic performances with photosensitivity of 3.7 � 10³ and responsivity of 1.4 � 103 A W^-1.All the results suggest 2DPTTI as a promising semiconducting 2DCP via Suzuki reaction on air-water interfaces for potential applications in multi-functional optoelectronic devices.3.We had successfully fabricated large-area monolayer 2DCP films,derived from the 3,8,13-tribromo-5,10,15-triethyltriindole(3-Br TTI)through a chemical vapor deposition(CVD)process on copper foil.The OFETs were fabricated based on the film to investigate the electrical properties.The film exhibited the good p-type semiconductor properties with a mobility of 30.8 cm² V^-1 s^-1.Moreover,The film have the ability of Raman enhancement of adsorbed organic molecules,which have great potential in application of organic optoelectronics.