Electropolymerization of triphenylamine-thiophene comonomers applied to electrochromic devices

• Main Authors: FENG, LI-TE, 馮立德
• Other Authors: YANG, CHIEN-HSIN
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/13298940132598504756

碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 104 === Triphenylamine (TPA) derivatives were first synthesized and performed electrochemical polymerization employing to the electrochromic devices in this study. In the first part of the experiment, nano titanium dioxide was spin-coated on an ITO electrode to form a porous working electrode, and then immersed in the triphenylamine derivative (monomer) solution 24 h. Adsorption of triphenylamine derivative monomer on this working electrode was used to study the effect between a functional group of –OH on nano titanium dioxide surface and the functionl groups on triphenylamine derivatives, which is correlated to the electrochemical behavior of electrochemical polymerization. Results showed that electron-donor ether-linked TPA (HTPA) and electron-acceptor cyano-linked TPA (3CN-TPA) cannot be polymerized on the substrate, but electron-acceptor carboxylic acid-linked TPA (TPAR1) can be polymerized on the substrate. On the other hand, the comonomers of HTPA-TPAR1 and 3CN-TPA-TPAR1 can be successfully copolymerized on the substrate, but the comonomer of HTPA-3CN-TPA cannot be copolymerized. The second part of the experiment, the monomers of triphenylamine derivatives were electrochemically copolymerized on a TiO2-coated ITO porous working electrode. The obtained polymer thin films were assembled into electrochromic devices. Experimental results showed that the optical contrast of these triphenylamine derivative polymer films is less than 40% with poor long-term operation stability. In this study, we tried to know the effects of thiophene-monomer addition into triphenylamine derivative monomers. The copolymer films were also employed to electrochromic devices. Results showed that the addition of the thiophene into triphenylamine derivatives can greatly enhance the optical contrast of electrochromic devices from from 40 to 60% and stability.