Zhu C.,Nanchang UniversityNanchang |
Wei L.,Nanchang UniversityNanchang |
Yuan P.,Nanchang UniversityNanchang |
Xiong L.,Nanchang UniversityNanchang |
Cheng X.,Nanchang UniversityNanchang
Instrumentation Science and Technology | Year: 2017
Novel chemiluminescence mechanisms of cerium(IV) and five tetracyclines in the absence and presence of Tween 80 are reported. The role of tetracyclines in the present chemiluminescence system was studied in detail by ultraviolet spectra and the singlet oxygen 1O2 probe 2-methyl-6-(4-methoxyphenyl)-3, 7-dihydroimidazo[1,2-a]-pyrazin-3-one hydrochloride. It is the first report that cerium(IV) reacted with tetracyclines producing singlet oxygen 1O2 after breaking the organic skeleton and decomposition of peroxyacetic acid in the absence of the surfactant Tween. Furthermore, by examining the effects of sodium azide and the chemiluminescence spectra, the results indicated that the maximum chemiluminescence emission at approximately 480 nm was due to dimer emission of singlet oxygen 1O2 from the reaction between cerium(IV) and tetracyclines as well as the reaction of cerium(IV) and Tween 80, respectively. Moreover, the chemiluminescence signals were unaffected when the reaction was performed under anaerobic condition, indicating that dissolved oxygen was independent of this system. Under the optimal conditions, the analytical characteristics and parameters of the cerium(IV)-Tween 80-tetracyclines chemiluminescence system were investigated. The present method was successfully employed for the determination of tetracyclines in milk. © 2017, Copyright © Taylor & Francis Group, LLC.
Du J.,Nanchang UniversityNanchang |
Gu X.,Nanchang UniversityNanchang |
Guo H.,Nanchang UniversityNanchang |
Liu J.,Nanchang UniversityNanchang |
And 2 more authors.
Journal of Crystal Growth | Year: 2015
High-density single-crystalline TiO2 nanowires are successfully fabricated on a TiSi2 layer using a new self-induced catalyst-free method by APCVD. The results show that the high aspect ratio nanowires with diameters of 20-50 nm and lengths of about 3 μm are obtained on a TiSi2 layer at 720 °C. The length of TiO2 nanowires increases with the preparation time until Ti is exhausted. The nanowires shape changes with the concentration of O2 and temperature. When the temperature is above 720 °C or the flux of O2 is over 6 sccm, the density and length of nanowires decrease under the combined effect of the increasing lateral surface diffusion and longitudinal growth. The formation of TiO2 nanowires comes along with the consumption of TiSi2, TiO2 nanowires grow along the  direction of the tetragonal rutile TiO2 crystal from the bottom, with the tip being pushed upwards. The growth process is proposed which is consistent with our experiment results. © 2015 Published by Elsevier B.V.