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硒化镉量子点合成遇到的问题
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各位大虾，小弟做量子点合成遇到了些问题.... sensitizer could be increased by repeating the assembly cycle. For CdSe sensitizer, the anion source was sodium selenosulfate (Na2SeSO3) solution, which was prepared by refluxing 0.3 M Se and 0.6 M Na2SO3 in an ethanol/Milli-Q ultrapure water (3:7) solution at 70 C for 2 h. 然后把阳极放在前驱物溶液中，加热到50℃来回循环。 我是先把2.3688g的硒粉和15.0403g的硫代硫酸钠放入250ML的三口烧瓶中，先加35ML水，然后加入15ml的甲醇，70摄氏度两个小时，但是还有好多硒粉没有溶解呢...，又加了21ml水和9ml甲醇，溶解了一会儿，还是不行、、、、、请问难道是加的顺序的问题么 还有一个问题，在前驱物中泡着，然后加热到50摄氏度，文献让泡20MIN，这让溶剂挥发好多啊。 请做过的大虾指导！！ 另一个问题，是硫化镉掺锰之后禁带宽度能有多大，如果做成硒化镉硫化镉的核壳结构，是否还是把硫化镉掺锰的量子点当做核。 另The photoactive semiconductor electrodes were prepared by successive ionic layer adsorption and reaction (SILAR) method.29−31 In brief, 0.1 M cadmium nitrate in methanol was used as cation source and 0.1 M sodium sulfide in 1:1 methanol and water as anion source. To incorporate doping of Mn2+, manganese acetate (0.075 M) was mixed with cadmium nitrate. This allowed coadsorption of Mn2+ and Cd2+ ions, which in turn facilitated incorporation of Mn2+ in the CdS film. Each cycle of SILAR consists of successive immersion of the FTO glass electrode, precoated with transparent active TiO2 layer and a scattering layer,14,32 in metal ion and sulfide (or selenide) anion solutions for 1 min. The cadmium and selenide ion precursor solution for CdSe was prepared by mixing 0.03 M cadmium nitrate and 0.03 M selenium oxide, respectively, with 0.06 M sodium borohydride, in degassed ethanol inside a glove box under N2 atmosphere. All the working electrodes were finally coated with 2 cycles of ZnS. The counter electrode was prepared by doctor blading Cu2S and reduced graphene oxide (RGO) composite on FTO glass. 为什么工作电极上还要循环两次硫化锌，是因为怕电子和电解液复合了么，谢谢！ |
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8楼2012-11-30 09:41:55
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