Comparison of chemiluminescence from luminol solution and luminol-TiO₂ suspension after illumination of a 355 nm pulse laser.
Chemiluminescence (CL) from luminol solution and luminol-TiO₂ 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 TiO₂ 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 TiO₂ 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 TiO₂ seemed to greatly contribute to the photocatalytically induced CL.
Min
Lingyue
L
Department of Materials Science and Engineering, Graduate School of Engineering, University of Fukui, 3-9-1, Bunkyo, Fukui, Japan.
Chen
Xueming
X
Wu
Xing-Zheng
XZ
D007834:Lasers; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation; D008165:Luminol / Q000737:chemistry*; D012996:Solutions; D013535:Suspensions / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
D012996:Solutions; D013535:Suspensions; C009495:titanium dioxide; D008165:Luminol; D014025:Titanium