Comparison of chemiluminescence from luminol solution and luminol–TiO2 suspension after illumination of a 355 nm pulse laser

✍ Scribed by Lingyue Min; Xueming Chen; Xing-Zheng Wu

• Book ID: 102760803
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 534 KB
• Volume: 25
• Category: Article
• ISSN: 1522-7235
• DOI: 10.1002/bio.1153

✦ Synopsis

Abstract

Chemiluminescence (CL) from luminol solution and luminol–TiO~2~ suspension after illumination of a 355 nm pulse laser is compared. Both the CL systems showed the CL spectra with maximum wavelength of 430 nm, suggesting that the emission was from the excite state of 3‐aminophthalate ion. The TiO~2~ photocatalytically induced luminol CL could be separately detected either when the pulse laser power was smaller than 0.15 mJ/pulse or a slit was placed beyond −2–2 mm in the vertical direction of the laser beam. The TiO~2~ photocatalytically induced luminol CL intensity was linear to the laser power, while that of the 355 nm pulse laser‐induced was nonlinear. A log–log plot between the 355 nm pulse laser‐induced luminol CL intensity and laser power showed a near‐linear regression fit with a slope of 2.11, suggesting that a two‐photon absorption process of luminol was present in the 355 nm pulse laser‐induced luminol CL. Adsorbed oxygen on the surface of TiO~2~ seemed to greatly contribute to the photocatalytically induced CL. Copyright © 2010 John Wiley & Sons, Ltd.