Nanotechnology: Electronics of Self-Assembled Nanostructures Based on Nanocrystallite Quantum Dots

9871996巴文迪这个项目结合了化学、物理、化学工程和材料科学方面的专业知识，以合成、加工和表征基于自组装量子点的纳米结构。它结合了创造纳米晶体量子点、表面衍生化、自组装以及超灵敏电子测量和光谱学的活动，以探索单个和耦合纳米晶体量子点的化学和物理。研究人员将在纳米尺度上开发纳米晶体的空间定位控制。自组装的蛋白质或寡核苷酸将被用作形成纳米结构的导向剂。这些生物分子中的每一个都可以被设计成与纳米晶体量子点表面的特定配体结合。然后，生物系统充当控制量子点在表面上定位的模板。将使用超灵敏电荷传感方法来探测此类量子点的电子结构。这些测量将解决量子点内部或表面电荷的能量离域和离域程度。此外，它还计划对带电的单量子点进行光谱表征。纳米晶点的光谱性质预计将强烈依赖于点中存在的电荷数量，类似于原子轨道的填充；这可能导致通过调整点上的电荷密度来控制光子与纳米结构的相互作用。这样的能力为使用纳米晶体量子点作为微光子设备的构建块提供了可能性。将敏感的电子测量与点的化学控制、它们的环境和它们的空间位置相结合的跨学科合作可能允许优化自组装纳米结构的化学和观察限制电子的新物理。该项目致力于具有高度技术相关性的科学和工程专题领域的基础研究问题。这项研究将在基础水平上为电子/光子器件的重要方面贡献新的知识。从研究中获得的基本知识和理解有望通过为设计和生产改进的材料和材料组合提供基本的理解和基础，从而有助于提高先进器件的性能。该计划的一个重要特点是通过在一个具有根本意义和技术意义的领域对学生进行培训，将研究和教育结合起来。研究生将在化学、物理、化学工程和材料科学领域的四名研究人员的共同指导下，从跨学科的角度整合研究和教育。这项研究资助是在纳米技术倡议(NSF 98-20)下提供的，并由MPS多学科活动办公室(OMA)、化学和运输系统司以及材料研究司共同资助。***

9871996 Bawendi This project combines expertise in Chemistry, Physics, Chemical Engineering, and Materials Science to synthesize, process and characterize self-assembled quantum dot based nanostructures. It integrates activities for creating nanocrystalline quantum dots, surface derivatization, self- assembly, and ultra-sensitive electronic measurements and spectroscopy, to explore the chemistry and physics of single and coupled nanocrystalline quantum dots. The investigators will develop control of spatial positioning of nanocrystallites on a nanometer scale. Proteins or oligonucleotides which self-assemble will be used as directing agents for the formation of nanostructures. Each of these biomolecules can be engineered to bind to a specific ligand on the surface of a nanocrystalline quantum dot. The biological system then serves as a template for the controlled positioning of quantum dots on a surface. Ultra- sensitive charge sensing methods will be used to probe the electronic structure of such quantum dots. These measurements will address both the energetics and the extent of delocalizaton of charges inside or localized on the surface of the quantum dots. Additionally, it is planned to spectroscopically characterize charged single quantum dots. The spectroscopic properties of nanocrystalline dots are expected to strongly depend on the number of charges present in the dot, analogous to the filling of atomic orbitals; this may lead to control over the interaction of photons with the nanostructures through adjustment of the charge density on the dots. Such a capability opens the possibility of using nanocrystalline quantum dots as building blocks for microphotonic devices. The interdisciplinary collaboration combining sensitive electronic measurements with the chemical control of the dots, their environment, and their spatial positioning may allow optimization of the chemistry of the self-assembled nanostructures and the observation of new physics of confine d electrons. %%% The project addresses basic research issues in a topical area of science and engineering having high technological relevance. The research will contribute new knowledge at a fundamental level to important aspects of electronic/photonic devices. The basic knowledge and understanding gained from the research is expected to contribute to improving the performance of advanced devices by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. Graduate students will be co-advised by the four investigators across the disciplines of Chemistry, Physics, Chemical Engineering, and Materials Science integrating research and education from an interdisciplinary perspective. This research grant is made under the Nanotechnology Initiative (NSF 98-20), and is co-funded by the MPS Office of Multidisciplinary Activities(OMA), the Division of Chemical and Transport Systems, and the Division of Materials Research. ***