Preparing Cu₂ZnSnS₄ films using the co-electrodeposition method with ionic liquids

Cu₂ZnSnS4（CZTS） films are successfully prepared by co-electrodeposition in aqueous ionic solution and sulfurized in elemental sulfur vapor ambient at 400 C for 30 min using nitrogen as the protective gas.It is found that the CZTS film synthesized at Cu/（Zn+Sn）=0.71 has a kesterite structure,a bandgap of about 1.51 eV,and an absorption coefficient of the order of 10 4 cm 1.This indicates that the co-electrodeposition method with aqueous ionic solution is a viable process for the growth of CZTS films for application in photovoltaic devices.     

硅胶负载聚乙烯基吡啶—钯催化剂的制备及其催化加氢性能的研究

利用硅胶表面的弱酸性和吸附性能,将某些碱性聚合物吸附在硅胶表面上,然后与PdCl_2络合,经还原,合成了硅胶负载的聚乙烯基吡啶-钯催化剂。用XPS、UV-Vis、电子显微镜等手段研究了催化剂的结构,观察了制备条件、组成等因素对其性能的影响。研究了各种反应条件与催化剂活性的关系及催化剂的稳定性和使用寿命。合成的催化剂对丙烯酸甲酯等底物具有很高的催化加氢活性。     

Crystal Structure and Interaction with DNA of [Ni(phen)(mal)(H_2O)_2]·3H_2O

1 INTRODUCTION In the last few years, much attention has been paid to the molecular structure and biological activity of coordinated complexes in inorganic chemistry field. Ni(Ⅱ) is one of the commonest transition metals with two coordination numbers (4 and 6)[1～3]. Ge- nerally speaking, Ni(Ⅱ) coordination mode depends on the structure of ligand, solvent and reaction con- ditions, among which ligand plays a decisive role and determines not only the molecular structure of the complex bu…     

脱铝MCM-49分子筛的结构、酸性及苯与丙烯液相烷基化催化性能研究

采用硝酸回流和水蒸气两种处理方法对用动态水热法合成的纳米MCM-49分子筛进行脱铝改性. 用XRD、氮气吸附-脱附、NH3-TPD、FTIR和NMR等技术进行了表征, 并考察了脱铝前后MCM-49分子筛在苯与丙烯液相烷基化反应中的催化性能. 27Al核磁共振谱表明, 硝酸回流和水蒸气处理能有效地脱除MCM-49分子筛的部分骨架铝和非骨架铝. NH3-TPD和FTIR表征结果表明, 脱铝降低了MCM-49分子筛的Brönsted酸和Lewis酸的酸量. 硝酸脱铝未改变分子筛的酸强度分布, 而在600 ℃水蒸气脱铝则造成酸强度的降低. 实验条件下, MCM-49分子筛的丙烯转化率为99.5%, 异丙苯的选择性为73.6%. 脱铝改性降低了烷基化反应活性和异丙苯的选择性, 提高了收率. 与脱铝前MCM-49分子筛相比, 常温下经硝酸处理5 h的脱铝MCM-49分子筛在保持催化活性相当的情况下, 异丙苯收率提高了5.3%.     

漫话新制的Cu(OH)2

高中有机化学中的重要试剂——"新制的Cu(OH)2",是一个特定的模糊的表述,之所以特定,是指该试剂是一种检验醛基存在的弱氧化剂;之所以模糊,是把该试剂当成一种Cu(OH)2的悬浊液(事实上分散系中并没有悬浊的Cu(OH)2).     

一类光子消灭算符a^N的正交归一化本征态的迭加态的振幅K次方压缩特性

本文对一类光子消灭算符a^N的正交归一化本征态的迭加态的振幅K次方压缩特性进行研究，结果表明一类光子消灭算符a^N的正交归一化本征态的迭加态的振幅K次方压缩特性明显地区别于a^N的正交归一化本征态的振幅K次方压缩。无论N取奇数还是偶数迭加态均在振幅K（K=Nt或Nt／2）次方压缩，     

Multi-Electron Processes in 4.15-11.08 keV/u^13C^6＋ on Argon Collisions

The relative partial cross sections for ^13C^6＋ -Ar collisions at 4.15-11.08 ke V/u incident energy are measured. The cross-section ratios σ^2E/σ^SC, σ^3E/σ^SC, σ^4E/σ^SC and σ^SE/σ^SC are approximately the constants of 0.514-0.05, 0.204-0.03, 0.064-0.03 and 0.024-0.01 in this region. The significance of the multi-electron process in highly charged ions （HCIs） with argon collisions is demonstrated （σ^ME/σ^SC as high as 0.794-0.06）. In multi-electron processes, it is shown that transfer ionization is dominant while pure electron capture is weak and negligible. For all reaction channels, the cross-sections are independent of the incident energy in the present energy region, which is in agreement with the static characteristic of classic models, i.e. the molecular Coulomb over-the-barrier model （MCBM）, the extended classical over-the-barrier model （ECBM） and the semiempirical scaling laws （SL）. The result is compared with these classical models and with our previous work of ^13C^6＋ -Ne collisions [Chin. Phys. Lett. 23 （2006） 95].     

被动锁模掺饵光纤激光器的研究

利用光孤子压缩纠缠态进行量子通信，是量子通信走向实用化的重要途径，为产生光孤子压缩纠缠态，要有大功率的超短fs脉冲源。利用Cr^4＋：YAG激光器其结构比较复杂，若利用被动锁模fs光纤激光器，结构简单得多。在此之前，人们对被动锁模光纤激光器进行了大量研究。