CdS quantum dots (QDs) were introduced as an interface modifier in the poly(3-hexylthiophene) (P3HT)/TiO2 nanorod arrays hybrid photovoltaic device. The presence of CdS QDs interlayer was found to provide enhanced light absorption, increased interfacial recombination resistance at the P3HT/TiO2 interfaces, thus leading to a lower recombination rate of the electrons due to the stepwise structure of band edge in P3HT/CdS/TiO2, which accounts for the observed enhanced photocurrent and photovoltage of the hybrid solar cells. The optimized performance was achieved in P3HT/CdS/TiO2 hybrid solar cells after deposition of CdS QDs for 10 cycles, with a power conversion efficiency of 0.57 %, which is nearly ten times higher than that of P3HT/TiO2. The findings indicate that inorganic semiconductor quantum dots provide effective means to improve the performance of polymer/TiO2 hybrid solar cells. 相似文献
High-spin states of 143Tb have been studied via the 118Sn(32S,1p4n)145Tb reaction by means of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions and γ-γ-t coincidences were performed with 12 BGO(AC)HPGe detectors. A level scheme for 145Tb including 41 γ-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the γ-ray excitation functions, γ-γ coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured γ-ray anisotropies. Considering the structure similarity between 143Eu and 145Tb, the low-lying levels in 145Tb are interpreted by coupling a h9/2 proton to the excited states in 144Gd core. 相似文献
Selective fluorescence turn on Zn2+ sensor with long-wavelength emission and a large Stokes shift is highly desirable in Zn2+ sensing area. We reported herein the synthesis and Zn2+ recognition properties of a new thiosemicarbazone-based fluorescent sensor L. L displays high selectivity and sensitivity toward Zn2+ over other metal ions in DMSO-H2O (1:1, v/v, HEPES 10 mM, pH = 7.4) solution with a long-wavelength emission at 572 nm and a large Stokes shift of 222 nm. Confocal fluorescence microscopy experiments demonstrate that L is cell-permeable and capable of monitoring intracellular Zn2+.
Graphical Abstract We report a new thiosemicarbazone-based fluorescent sensor (L) for selective recognition of Zn2+ with a long wavelength emission and a large Stokes shift.
The influences of oxalate anions on manganese electrodeposition in sulfate solution were investigated on the basis of cathode current efficiency, characterization of SEM-EDX and XRD, solution chemistry calculation, thermodynamics and electrochemical test. The experimental results show that the range of (NH4)2C2O4 was adjusted from 0 mol/L to 4.8?×?10?3 mol/L. And 1.5?×?10?3 mol/L (NH4) 2C2O4 was suitably used with initial pH 7.0. The characterization of SEM indicates that oxalate anions can improve the morphology of electrodeposited films. The electrodeposited films containing manganese were characterized and determined by EDX and XRD. The solution chemistry calculation of catholyte and oxalate anions shows that the main active species are MnSO4, Mn(SO4)2? 2, Mn2+, Mn(SO4)C2O2? 4, MnC2O 4, Mn(NH3)2+, and C2O2? 4. The reaction trend between C2O2? 4 and Mn2+ ions is confirmed by computation of reaction energy. Electrochemical test analysis indicates oxalate anions increase the overpotentials of hydrogen evolution reaction and manganese electrodeposition. 相似文献
