聚3，4-乙撑二氧噻吩（PEDOT）电致变色薄膜的制备及性能研究

发布时间：2018-07-10 10:40

本文选题：PEDOT + 电致变色　；参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：聚3,4-乙撑二氧噻吩(PEDOT)是一种较为常用的导电聚合物。作为功能层、导电层和空穴传输层,可广泛应用在电致变色、染料敏化太阳能电池和超级电容器等多种电化学和电储能器件中。而相较于其他电致变色材料,PEDOT由于其对比度较低,且循环寿命较短,颜色单一,在实际应用中受到了很大的制约。为了改善PEDOT薄膜的电致变色性能,本文采用电化学方法合成PEDOT薄膜,研究工艺参数对薄膜形貌、结构、性能的影响,并构筑了三维有序大孔(3DOM)薄膜,研究微结构对薄膜性能的影响。设计组装可以采用同极性着色材料组装的器件,设计一套可向智能窗类应用转换的温度控制变色算法,探索其可行性。在离子液体中采用恒电压法电化学合成了PEDOT电致变色薄膜,分别讨论了沉积电压、单体浓度和沉积时间对薄膜性能的影响。研究结果表明EDOT(3,4-乙撑二氧噻吩)浓度为0.1 M,电压1.2 V下沉积40 s,可得到性能最好的PEDOT薄膜。薄膜的对比度为61.8%,着色效率为238.7 cm2·C 1,着色时间为0.74 s。以703、552和428三种粒径的聚苯乙烯胶体晶体为模板,采用恒电流沉积制备不同孔径大小的3DOM PEDOT薄膜。确定工艺条件为:恒电流1*10-4mA/cm2沉积,四氢呋喃中浸泡10 h-12 h。测试并计算出三种不同孔径3DOM PEDOT薄膜和无结构PEDOT薄膜的扩散系数,发现3DOM薄膜的扩散系数是无结构薄膜的10倍。有序微结构可有效降低薄膜的褪色电压,且大幅提高了电致变色薄膜的循环性能,此外3DOM微结构可以使薄膜的透过率波谷发生红移,703nm模板制作的3DOM PEDOT薄膜波谷红移了58 nm。由于有序结构的布拉格衍射,薄膜表现出明显的结构色。以同极性着色材料制备的新型器件与单层的器件相比,电致变色性能有很大的提升,对比度从40%增大到了55%,循环150次基本无衰减,300次之后对比度为47%,褪色时间从362 ms减小到了203 ms。着色效率从91.18 cm2·C 1提高到181.55 cm2·C 1。设计了一套温度控制的算法,并且将其一部分算法编译为C语言,上载到单片机的RAM里,在实际使用中可以根据外界温度控制器件的变色。
[Abstract]:Poly (3 o 4-ethylenedioxythiophene (PEDOT) is a common conductive polymer. As functional layer, conductive layer and hole transport layer, they can be widely used in electrochromic, dye sensitized solar cells, supercapacitors and other electrochemical and electric energy storage devices. Compared with other electrochromic materials, PEDOT is restricted in practical application because of its low contrast, short cycle life and single color. In order to improve the electrochromic properties of PEDOT thin films, PEDOT thin films were synthesized by electrochemical method. The effects of process parameters on the morphology, structure and properties of PEDOT thin films were studied. The effect of microstructures on the properties of the films was studied. The device can be assembled with the same polarity coloring material and a set of temperature-controlled discoloration algorithm which can be converted to the intelligent window application is designed to explore its feasibility. PEDOT electrochromic films were synthesized by constant voltage method in ionic liquids. The effects of deposition voltage, monomer concentration and deposition time on the properties of PEDOT films were discussed. The results show that the best PEDOT films can be obtained when the concentration of EDOT is 0.1 Mand the voltage is 1.2 V for 40 s. The contrast of the film is 61.8 and the coloring efficiency is 238.7 cm2 / C ~ (-1). The coloring time is 0.74 s. The 3Dom PEDOT films with different pore sizes were prepared by constant current deposition using three polystyrene colloidal crystals of 703552 and 428 sizes as templates. The process conditions were determined as follows: constant current 1*10-4mA/cm2 deposition, immersion in tetrahydrofuran for 10 h-12 h. The diffusion coefficients of 3 Dom PEDOT thin films and unstructured PEDOT thin films with different pore sizes are measured and calculated. It is found that the diffusion coefficients of 3Dom thin films are 10 times of those of unstructured films. The ordered microstructures can effectively reduce the fading voltage of the films and greatly improve the cyclic performance of the electrochromic films. In addition, the 3Dom microstructures can make the transmittance troughs of the films red shift from 703nm template to 58 nm. Due to the Bragg diffraction of the ordered structure, the film shows obvious structural color. Compared with single-layer devices, the electrochromic properties of the new devices prepared with the same polarity coloring materials have been greatly improved. The contrast is increased from 40% to 55, the contrast is 47m after 150 cycles without attenuation 300 times, and the fading time is reduced from 362 Ms to 203 Ms. The coloring efficiency was increased from 91.18 cm2 / C ~ (-1) to 181.55 cm2 C ~ (-1). A set of temperature control algorithms is designed and some of the algorithms are compiled into C language and uploaded into the RAM of a single chip microcomputer. In practice, the temperature controller can change color according to the external temperature controller.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.2

【引证文献】