Poly(3,4-ethylenedioxythiophene) (PEDOT)-Coated Silica Spheres: Electrochemical Modulation of the Optical Properties of a Hydrogel-Stabilized Core-Shell Particle Suspension

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• 作者：Jamie C. Sharp Norton ; Moon G. Han ; Ping Jiang ; Goo H. Shim ; Yurong Ying ; Stephen Creager ; Stephen H. Foulger
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：September 19, 2006
• 年：2006
• 卷：18
• 期：19
• 页码：4570 - 4575
• 全文大小：262K
• 年卷期：v.18,no.19(September 19, 2006)
• ISSN：1520-5002

文摘

In situ electrochemical methods involving both oxidative and reductive mediators were employed tomodify the oxidation state (doping level) of PEDOT polymers in colloidal PEDOT-coated silica core-shell particles that were prepared as a dispersion encapsulated in a hydrogel matrix. The hydrogel-stabilizedPEDOT particle suspensions were prepared as thin films (several hundred micrometers thick) on an ITOelectrode surface and were equilibrated with an aqueous electrolyte containing a cocktail of redox mediatorsprior to mounting in a transmission-mode spectroelectrochemical cell. The modifications of the redoxstates of the PEDOT coating induced a change in the absorbance characteristics of the hydrogel films.The coated particles exhibited a maximum absorption peak centered at 800 nm in their doped (oxidized)state that could be significantly reduced through the electrochemical de-doping (reduction) of the PEDOT-coating on the particles.