Gas Phase Single Nanoparticle Characterisation

气相单纳米粒子表征

• 批准号: 461913655
• 负责人: Professor Dr. Knut R. Asmis
• 金额: --
• 依托单位: Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/461913655?language=en
• 关键词: Gas; Phase; Single; Nanoparticle; Characterisation

Nanoparticle samples suffer from physical as well as chemical heterogeneity. This leads to a reduced performance in technological applications. Performance optimisation requires obtaining insights into the intrinsic properties of individual nanoparticles and how they contribute to the properties of the ensemble. Most single nanoparticle techniques, however, probe deposited particles, whose properties are perturbed, either by the support or neighbouring particles. Probing truly inherent properties requires isolating nanoparticles in the gas phase. Here, I propose to develop groundbreaking, ultrasensitive mass spectrometric and laser spectroscopic tools to study single nanoparticles isolated in the gas phase. Charged metal, semiconductor and insulator nanoparticles in the size range from 5 to 100 nm will be trapped in a buffer-gas filled, temperature-controlled (10-300 K) cryogenic quadrupole ion-trap optimised for spectroscopy. The absolute mass and absolute charge of single, trapped nanoparticles will be determined non-destructively and quasi-continuously by optical means. Temperature-programmed desorption mass spectrometry, UV/Vis action spectroscopy and dispersed fluorescence spectroscopy will be used to accurately determine the temperature and characterise the optical properties of single semiconductor nanocrystals, to study plasmonic excitations in bare and coated metal nanoparticles, and to monitor the temporal evolution of energy conversion in fluorescent nanodiamonds. The overarching goal is to establish a novel single nanoparticle characterisation tool set that allows dissecting nanoparticle heterogeneity in order to improve the performance of nanoparticle applications across all disciplines, e.g., the sensitivity of nanosensors, the selectivity of nanocatalysts or the efficiency of drug nanocarriers.

纳米颗粒样品存在物理和化学不均一性。这导致技术应用中的性能下降。性能优化需要深入了解单个纳米颗粒的内在特性，以及它们如何影响整体性能。然而，大多数单纳米粒子技术探测沉积的粒子，其性质受到支撑或邻近粒子的干扰。探测真正的固有特性需要在气相中分离纳米颗粒。在这里，我建议开发突破性的、超灵敏的质谱和激光光谱工具来研究分离在气相中的单个纳米颗粒。带电的金属、半导体和绝缘体纳米粒子的尺寸范围从5到100纳米，将被困在缓冲气体中，温度控制（10-300 K）的低温四极离子阱中，为光谱学优化。用光学方法非破坏性地、准连续地测定捕获的单个纳米粒子的绝对质量和绝对电荷。程序升温解吸质谱法、紫外/可见作用光谱法和分散荧光光谱法将用于精确测定单半导体纳米晶体的温度和光学特性，研究裸金属和涂覆金属纳米颗粒中的等离子体激发，并监测荧光纳米金刚石中能量转换的时间演变。总体目标是建立一个新的单纳米颗粒表征工具集，允许解剖纳米颗粒的异质性，以提高纳米颗粒在所有学科中的应用性能，例如，纳米传感器的灵敏度，纳米催化剂的选择性或药物纳米载体的效率。