Infrared Spectroscopic Study of ¥á-Cyano-4-hydroxycinnamic Acid on Nanocrystalline TiO2 Surfaces: Anchoring of Metal-Free Organic Dyes at Photoanodes in Dye-Sensitized Solar Cells

Bulletin of the Korean chemical society

Sang Woo Joo¹  Uuriintuya Dembereldorj¹ 

关键词: Cyanoacrylic acid;    Metal-free organic dye;    Self-assembly;    TiO2;    Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Adsorption structures of the self-assembled thin films of �?-cyano-4-hydroxycinnamic acid (CHCA) anchoring on TiO₂ surfaces have been studied by using temperature-dependent diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy. From the presence of the strong �?(COO^?) band at ~1390 cm^-1 along with the disappearance of the OH bands in the carboxylic acid group in the DRIFT spectra at room temperature, CHCA appeared to adsorb onto TiO₂ surfaces as a carboxylate form. The absence of the out-of-plane benzene ring modes of CHCA in the DRIFT spectra suggests a rather vertical orientation of CHCA on TiO₂. Above ~220 oC, CHCA seemed to start to thermally degrade on TiO₂ surfaces referring from the disappearance of most vibrational modes in the DRIFT spectra, whereas the �?(C �? N) bands were found to remain relatively conspicuous as the temperature increased even up to ~460 oC.

【 授权许可】

Unknown