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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Self-Assembled Multilayers of CdSe Nanocrystals and Hydrazine or Linear Diamines
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Self-Assembled Multilayers of CdSe Nanocrystals and Hydrazine or Linear Diamines

机译：CdSe纳米晶体与肼或线性二胺的自组装多层

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摘要

Hydrazine and two linear diamines, H2N-(CH2)_n-NH2 (n = 2 and 6), were reacted with (hexadecylamine/stearate)-capped CdSe nanoparticles (7.5 nm diameter) to form multilayers on ITO glass via layer-by-layer alternation. The new materials were investigated by cyclic voltammetry (CV), UV—vis and FTIR spectroscopies, and photoconductivity. FTIR analysis of multilayer growth showed the complete removal of both L (hexadecylamine) and X (stearate) caps; the latter occurred via complexation of the external cadmium layer. Bulk CdSe/hydrazine polymer, obtained from treatment of a CdSe nanocrystal (CdSe-NC) dispersion with excess hydrazine, included massive amounts of hydrazine in a N2H4/CdSe molar ratio of approximately 24. On the contrary, CV analysis showed that hydrazine covers the NC surface of multilayers with approximately 2 x 10~(-9) mol cm~(-2); specifically, the N2H4,/CdSe molar ratio was much lower (ca. 0.5). FTIR analysis of bulk CdSe/diamine polymers showed the same NC surface coverage, (l—2) X 10~(-9) mol cm~(-2) , of the CdSe/hydrazine multilayers. The shortest hydrazine linker results in the highest photocurrent values. Diamines display lower photoconductivity values, decreasing as the N—N distance is increased.
机译：肼和两个线性二胺H2N-（CH2）_n-NH2（n = 2和6）与（十六烷基胺/硬脂酸酯）封端的CdSe纳米颗粒（直径7.5 nm）反应，逐层在ITO玻璃上形成多层层交替。通过循环伏安法（CV），UV-vis和FTIR光谱学以及光电导性研究了这种新材料。多层生长的FTIR分析表明，L（十六烷基胺）和X（硬脂酸酯）帽均被完全去除;后者是通过外部镉层的络合而发生的。通过用过量的肼处理CdSe纳米晶体（CdSe-NC）分散体而获得的大块CdSe /肼聚合物包括大量的N2H4 / CdSe摩尔比约为24的肼。相反，CV分析表明，肼覆盖了约2 x 10〜（-9）mol cm〜（-2）的多层的NC表面;具体地说，N 2 H 4 / CdSe的摩尔比要低得多（约0.5）。大量CdSe /二胺聚合物的FTIR分析显示，CdSe /肼多层膜具有相同的NC表面覆盖率，即（1-2）X 10〜（-9）mol cm〜（-2）。最短的肼接头导致最高的光电流值。二胺显示出较低的光电导率值，随着NN距离的增加而降低。

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