High performance perovskite solar cells using TiO2 nanospindles as ultrathin mesoporous layer

Single crystal anatase TiO2 nanospindles （NSs） with highly exposed {101} facets were synthesized and employed as electron transport materials （ETMs） in perovskite solar cells （PSCs）. Time-resolved photoluminescence （TRPL） spectra revealed that the TiO2 NSs are more effective than TiO2 nanoparticles in accepting electrons from perovskite. Moreover. the TiO2 nanospindles further endowed the PSCs with good reproducibility and suppressed hysteresis. The best device with TiO2 NSs as ETMs yielded power conversion efficiency （PCE） of 19.6%, demonstrating that the home-made TiO2 NSs is a good ETM for PSCs.

Fabrication of a Sensitive Electrochemical Biosensor for Detection of DNA Hybridization Based on Gold Nanoparti- cles/CuO Nanospindles Modified Glassy Carbon Electrode

In this work, a sensitive electrochemical DNA biosensor for the detection of sequence-specific target DNA was reported. Firstly, CuO nanospindles （CuO NS） were immobilized on the surface of a glassy carbon electrode （GCE）. Subsequently, gold nanoparticles （Au NPs） were introduced to the surface of CuO NS by the electrochemical deposition mode. Probe DNA with SH （HS-DNA） at the 5＇-phosphate end was covalently immobilized on the surface of the Au NPs through Au-S bond. Scanning electron microscopy （SEM） was used to elucidate the morphology of the assembled film, and electrochemical impedance spectroscopy technique （EIS） was used to investigate the DNA sensor assembly process. Hybridization detection of DNA was performed with differential pulse voltammetry （DPV） and the methylene blue （MB） was hybridization indicator. Under the optimal conditions, the decline of reduction peak current of MB （A/） was linear with the logarithm of the concentration of complementary DNA from 1.0 X 10-13 to 1.0× 10-6 mol·L l with a detection limit of 3.5 × 10 14 mol·L -1 （S/N=3）. In addition, this DNA biosensor has good selectivity, and even can distinguish single-mismatched target DNA.

Synthesis of RE(OH)_2Cl and REOCl (RE=Eu, Tb) nanostructures

Anisotropic structures, nanoneedles, and nanospindles of rare earth hydroxychloride （RE（OH）2Cl） and oxychloride （REOCl） （rare earth=Eu and Tb） were synthesized. The rare earth hydroxychloride nanostructures were formed via a thermally assisted hydrolysis of the rare-earth sesquioxide nanocrystals. The morphological evolution of the nanostructures was studied using high-resolution transmission electron microscopy and scanning electron microscopy, while the structural evolution was investigated using X-ray diffraction techniques. The thermal stability of the rare earth hydroxychlorides was investigated using thermogravimetric analysis. The rare earth oxychloride nanospindles were synthesized via a simple heat-treatment of rare earth hydroxychloride nanospindles.

多层壳结构α-Fe_2O_3中空微球用作高倍率超级电容器的研究（英文）

中空结构的金属氧化物在能源储存和转化系统中已被广泛研究.本文报道了纳米纺锤自组装的多层中空α-Fe_2O_3微米球.β-FeOOH前驱体纳米锤首先在炭球表面沉积生长得到β-FeOOH@炭球复合材料,然后在空气中烧结移除模板,转变为多层中空α-Fe_2O_3微米球.该材料用作超级电容器的电极材料具有高容量和良好的倍率性能该电极在1和5 A g^(-1)的条件下,可以释放630和510 F g^(-1)