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Cooperative Catalysis of p-Aminophenol and Titanocene Dichloride in DirectMannich Reactions with Acetone. -Titanocene dichloride/p-aminophenol acts as efficient catalytic system, which allows for mild and highly efficient direct three-component Mannich reactions of both aryl and alkyl ketones. Mechanistic studies show the synergistic effect of the new binary catalytic system. -(ZHU, X.; CHEN, C.; YU, B.; ZHANG, G.; ZHANG*, W.;

This study presents the fabrication of ZnO nanosheets on a glass substrate using a room-temperature (approximately 25 • C) solution method. The average length and diameter of the ZnO nanosheets were 1.2 μm and approximately 5 nm, respectively. The ultraviolet (UV)-to-visible rejection ratio of the sample is approximately 42 when biased at 1 V, and the fabricated UV photodetector is visible-blind with a sharp cutoff at 370 nm. The transient time constants measured during the rise time and fall time were τ r = 5.37 s and 6.02 s, respectively. The low-frequency noise spectra obtained from the UV photodetector were caused purely by the 1/f noise. The noise-equivalent power and normalized detectivity (D * ) of the ZnO nanosheet photodetector were 6.12 × 10 −9 W and 2.17 × 10 9 cm·Hz 0 .5 W −1 , respectively.

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