A bis-selenophene substituted alkoxy benzene derivative as a highly stable novel electrochromic polymer

Up to date there are few studies reporting the use of selenophene derivatives as electrochromic polymers. This report highlights the synthesis of a selenophene containing multi-ring aromatic polymer which possesses reasonable optical contrasts at both visible and near-IR regions. Electrochemical synthesis of a conducting polymer from a multi-ring aromatic monomer, 2-(2,5-bis(hexyloxy)-4-(selenophen-2-yl)phenyl)selenophene (BSB(OC6H13)(2)), was achieved at a lower potential than its corresponding parent, selenophene. The strong absorption band for the undoped polymer was 474 run and the onset energy for the pi-pi transition (Eg) was 1.9 eV (645 nm)

A thiazolothiazole containing multichromic polymer for glucose detection

Donor-acceptor (DA) type monomers namely 2,5-di(thiophen-2-yl)thiazolo[5,4-d]thiazole (TTzTh) and 2,5-bis(3-methylthiophen-2-yl)thiazolo[5,4-d]thiazole (TTzMTh) were synthesized and their electrochemical and optoelectronic properties were investigated in detail. The spectro-electrochemical analysis showed that the alkyl chain substitution results in a shift in the onset of the pi-pi* transition towards longer wavelengths. Depending on the donor substituents, the polymers exhibited optical band gaps 1.65 and 1.85 eV for PTTzTh and PTTzMTh, respectively. Electrochromic studies revealed that both polymers are p-dopable and multichromic. Moreover, polymer of TTzTh (PTTzTh) has been used for the development of a glucose biosensor. Glucose oxidase (GOx) was anchored on a graphite electrode which was previously modified with a film of the conjugated polymer, PTTzTh by electropolymerization. Such a sensor showed a wide linear range (0.05 - 2.0 mM), good sensitivity (36.32 mu A/(mM.cm(2)) and low limit of detection (LOD) (0.075 mM) under formerly optimized conditions. Moreover, the accuracy of the biosensor was successfully tested using two different beverages to detect glucose. Electrochemical characterizations of the polymers and their biosensor application were investigated for the first time in this work

A thiazolothiazole containing multichromic polymer for glucose detection

Donor-acceptor (DA) type monomers namely 2,5-di(thiophen-2-yl)thiazolo{[}5,4-d]thiazole (TTzTh) and 2,5-bis(3-methylthiophen-2-yl)thiazolo{[}5,4-d]thiazole (TTzMTh) were synthesized and their electrochemical and optoelectronic properties were investigated in detail. The spectro-electrochemical analysis showed that the alkyl chain substitution results in a shift in the onset of the pi-pi{*} transition towards longer wavelengths. Depending on the donor substituents, the polymers exhibited optical band gaps 1.65 and 1.85 eV for PTTzTh and PTTzMTh, respectively. Electrochromic studies revealed that both polymers are p-dopable and multichromic. Moreover, polymer of TTzTh (PTTzTh) has been used for the development of a glucose biosensor. Glucose oxidase (GOx) was anchored on a graphite electrode which was previously modified with a film of the conjugated polymer, PTTzTh by electropolymerization. Such a sensor showed a wide linear range (0.05 - 2.0 mM), good sensitivity (36.32 mu A/(mM.cm(2)) and low limit of detection (LOD) (0.075 mM) under formerly optimized conditions. Moreover, the accuracy of the biosensor was successfully tested using two different beverages to detect glucose. Electrochemical characterizations of the polymers and their biosensor application were investigated for the first time in this work

A new ethanol biosensor based on polyfluorene-g-poly(ethylene glycol) and multiwalled carbon nanotubes

Functionalization of the conjugated polymers has gained considerable interest in the biomedical engineering and biosensing applications as distinct properties can be imparted to the corresponding pristine analogues. In the present work, we report a novel sensing platform for the quantification of ethanol through a macromolecular design involving polyfluorene-g-poly(ethylene glycol) (PF-g-PEG) and multiwalled carbon nanotubes (MWCNTs). First, poly(ethylene glycol) with fluorene functionality (PEG-FL) was synthesized with a one-step procedure and characterized. The nanotube modified electrodes were then used as working electrodes for the electropolymerization of PEG-FL macromonomer to form PF-g-PEG films on the electrode surface. Finally, alcohol oxidase enzyme was immobilized on the modified surfaces. Similar devices without MWCNTs or PF-g-PEG were prepared and compared. Sensor properties for selective ethanol detection were investigated and it was found that PF-g-PEG modified MWCNTs exhibited the highest sensing ability. The potential practical application of the fabricated biosensor is demonstrated in alcoholic drinks for the analysis of ethanol contents