Preparation of polymer/nanoparticle hybrid assemblies based on polymer nanosheets

该项目旨在制备由金属纳米颗粒和聚合物纳米片组成的杂化纳米准分子，该项目还包括基于聚合物纳米片构建块的软纳米器件的制备。利用由朗缪尔-布洛杰特薄膜组成的聚合物纳米组装，并结合集成光波导和表面等离子体共振技术等多种光学技术，制备了聚合物纳米片。主要研究内容如下：1.聚合物纳米膜固定金纳米颗粒将金纳米颗粒有效地吸附在含4-乙烯基吡啶的聚合物纳米膜上，形成吸附的金纳米颗粒单分子膜。聚合物纳米片显示出有效的粘附力来固定金纳米颗粒。此外，通过紫外光照射的图案化聚合物薄片作为模板来定向金纳米颗粒。这项技术在控制纳米颗粒单层有序性方面具有巨大的应用潜力。2.具有聚合物非薄膜组装的分子逻辑门我们配置了两个工作在不同波长的纳米片二极管来产生逻辑门(AND和EXOR)。在聚合物纳米片逻辑门中，输入信号是每个生色团的激发波长，输出是光电流，这归因于发色团层与施主或受主层之间的层间电荷转移。在300 nm处菲层的选择性光激发时，菲与二硝基苯单元之间的层间电荷转移产生了近70pA，而在380 nm处的菲层选择性光激发也同样产生了约70pA的光激发。另一方面，这两个发色团的激发产生了大约190pA的光电流。在这种聚合物纳米片和逻辑门中，高能级和低能级被分开了2.7倍。

This project aims at preparation of hybrd nanosssemblies consisting of metal nanoparticle and polymer nanosheets, The projects also involves fabrication of soft nanodevices based on polymer nanosheet building blocks. Polymer nanosheets were fabricated by Polymer nano-assemblies consisting of Langmuir-Blodgett films was used and coupled with various optical techniques, such as integrated optical waveguide and surface plasmon resonance technique. Two topics of the findings were summarized as follows ;1.Gold Nanoparticle Immobilization with Polymer NanosheetsGold nanoparticles are adsorbed effectively onto a polymer nanosheet containing 4-vinylpyridine, yielding an adsorbed gold nanoparticle monolayer. The polymer nanosheet showed efficient adhesion forces to immobilize gold nanoparticles. Moreover, the patterned polymer sheet by UV irradiation worked as a template to direct gold nanoparticles. This technique has great potential for applications for controlling nanoparticle monolayer ordering.2.Molecular Logic Gates with Polymer Nonosheeets AssembliesWe configure two nanosheets diodes that operate at different wavelengths to produce the logic gates (AND and EXOR). In the polymer nanosheet logic gates, input signals are excitation wavelength of each chromophore and the output is photocurrent, which is attributed to the interlayer charge-transfer between the chromophore layer and the donor or the acceptor layer. In the case of selective photoexcitation of the phenanthrene layer at 300 nm, almost 70 pA was generated by the interlayer charge-transfer between phenanthrene and dinitrobenzene unit and also the selective photoexcitation of the anthracene layer at 380 nm produced approximately 70 pA by a similar manner. On the other hand, the excitation of both chromophore layers produced approximately 190 pA photocurrent. In this polymer nanosheet AND logic gate, the high and low levels were separated by a factor of 2.7.