| 摘要: | 本研究的目的主要在解析紫外光開/關照射刺激時聚(3,4-乙烯二氧?吩):聚苯乙烯磺酸薄膜導電度響應原因，並且以微結構的角度量化分析造成此開/關效應以及響應率的結果，以期望製備具多功能性的紫外光感測器。為了提升聚(3,4-乙烯二氧?吩):聚苯乙烯磺酸紫外光感測器的訊號靈敏性，我們添加不同種類的摻雜劑(甲苯、二甲基亞?、鋰鹽、PEG)於PEDOT:PSS薄膜中，並量測在紫外光交替開/關照射下其導電度的變化，也發現各系統有不同的導電度響應率且摻雜高濃度的二甲基亞?(1 vol%、5 vol%、10 vol%)、鋰鹽(50 wt%)、PEG (30 wt%、50 wt%)會失去開/關響應性質。爾後，我們以拉曼光譜得知聚(3,4-乙烯二氧?吩):聚苯乙烯磺酸薄膜導電度變化的原因源自於benzoid/quinoid結構間的轉換，同時了解到導電度響應率取決於亞穩態benzoid 構象含量的多寡，越多亞穩態的benzoid構象其導電度響應率越高。我們也利用聚(3,4-乙烯二氧?吩):聚苯乙烯磺酸製備出一個對紫外光具有刺激響應性質、可偵測濕度以及具防偽功能的多功能光晶感測器。;The purpose of this study is to probe the reason of ultraviolet stimulation and response of conductivity for poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid (PEDOT:PSS) thin films under ultraviolet on/off switching. The results of the UV on/off effect and responsivity are quantitatively analyzed from the perspective of microstructure, in order to prepare a multifunctional ultraviolet light sensor. To improve the signal sensitivity of the PEDOT:PSS UV sensor, we added different kinds of dopants(toluene, dimethyl sulfoxide, lithium salt, PEG) to the PEDOT:PSS thin film, and measure the change of its conductivity under the alternating on/off irradiation of UV light. We found that each dopping system has a different conductivity response rates, but lose the on/off response properties at high concentrations of dimethyl sulfoxide (1 vol%, 5 vol%, 10 vol%), lithium salt (50 wt%), PEG (30 wt%, 50 wt%). From results of Raman spectroscopy, the conductivity of PEDOT:PSS film changes can be attributed to the conversion between benzoid and quinoid confromations. We also understand that the different conductivity response rate by UV stimulation depends on the content of the metastable benzoid conformation of PEDOT crystals. The more metastable benzoid conformations within PEDOT crystals have the higher responsivity of conductivity. We also use PEDOT:PSS to prepare a multifunctional photonc crystal detector that has stimulus response properties to ultraviolet light, can detect humidity, and has anti-counterfeiting functions. |
