有机/无机杂化纳米粒子制备多孔增透膜

以甲基丙烯酸四氟丙酯-co-γ-甲基丙烯酰氧丙基三甲氧基硅烷[P(TFPMA-co-TMSPMA)]共聚物和聚苯乙烯(PS)二元混合乳液旋涂成膜,再采用环己烷选择性溶解除去PS纳米粒子的方法制备了多孔有机/无机杂化纳米基光学增透膜。研究了二元混合乳液固含量、旋涂速度及纳米粒子粒径等参数对增透膜性能的影响。通过选用不同固含量的混合乳液以及改变成膜转速,可制得膜厚在109～208nm之间,折射率nf在1.22～1.25之间,在400～1100nm波段均获得最大透射率高于99.1%的增透膜;此外,研究发现膜的粗糙度及透射率对纳米粒子粒径有较强的依赖性,减小成膜乳液粒子粒径可有效降低膜的粗糙度。     

Unconventional room-temperature negative magnetoresistance effect in Au/n-Ge:Sb/Au devices

Non-magnetic semiconductor materials and their devices have attracted wide attention since they are usually prone to exhibit large positive magnetoresistance(MR) effect in a low static magnetic field environment at room temperature.However, how to obtain a large room-temperature negative MR effect in them remains to be studied. In this paper, by designing an Au/n-Ge:Sb/Au device with metal electrodes located on identical side, we observe an obvious room-temperature negative MR effect in a specif...