Molecular Level Understanding of Dynamic Speciation to Inform Complex Reaction Pathways and Control the Rational Synthesis of Ternary Semiconductor Nanoparticles

分子水平上对动态形态的理解，以了解复杂的反应途径并控制三元半导体纳米颗粒的合理合成

• 批准号: 2109141
• 负责人: Amy Prieto
• 金额: $ 49万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2109141&HistoricalAwards=false
• 关键词: Molecular; Level; Understanding; Dynamic; Speciation

With the support of the Macromolecular, Supramolecular, and Nanochemistry Program in the Division of Chemistry, Dr. Amy Prieto of Colorado State University is developing a synthetic toolkit for understanding and controlling the reactivity of selenium species that can direct the synthesis of phase pure ternary semiconductor nanoparticles. These nanomaterials, which are composed of non-toxic, earth-abundant elements, have the potential to offer tunable optoelectronic properties that could be exploited in photovoltaic devices. Dr. Prieto involves high school, undergraduate, and graduate students in this research. The Prieto research team is also developing hands-on learning kits for middle school students that focus on solar cells to engage them in key energy topics. This research involves elucidating how the precursor to monomer transformation of Se powder in high boiling point surfactants can yield phase-pure ternary semiconductor nanoparticles. This includes probing the speciation of reactive components that lead to phase pure copper selenophosphate nanoparticles by focusing on the Lewis acidity and basicity of selenium monomers, understanding these synthetic parameters to controllably access phosphorous deficient metastable C/P/Se nanoparticles, and extrapolating this chemistry to synthesize a new silver compound that contains both phosphorus and selenium. This research is focusing on a diverse range of tools to identify solution species and crystalline products under both in-situ reaction conditions and post-synthesis. By developing this tool kit for the synthesis of semiconductor nanoparticles, reaction pathways for pure phase ternary and quaternary nanoparticles with tunable composition, structure, and surface chemistry are expected and these could be exploited in future photovoltaics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学学部大分子、超分子和纳米化学项目的支持下，科罗拉多州立大学的Amy Prieto博士正在开发一种合成工具包，用于理解和控制硒的反应性，从而指导纯相三元半导体纳米颗粒的合成。这些纳米材料是由无毒的、地球上丰富的元素组成的，有潜力提供可调的光电特性，可以在光伏设备中利用。普列托博士让高中生、本科生和研究生参与了这项研究。普列托研究小组还在为中学生开发太阳能电池的动手学习工具包，让他们参与关键的能源话题。本研究涉及阐明在高沸点表面活性剂中硒粉单体转化的前驱体如何产生相纯的三元半导体纳米颗粒。这包括通过关注硒单体的刘易斯酸度和碱度来探测导致相纯硒化磷酸铜纳米粒子的活性成分的形态，了解这些合成参数以可控地获得缺磷亚稳态C/P/Se纳米粒子，并推断这种化学反应来合成一种既含磷又含硒的新银化合物。本研究的重点是在原位反应条件下和合成后鉴定溶液种类和结晶产物的各种工具。通过开发这个用于合成半导体纳米粒子的工具箱，预计纯相三元和四元纳米粒子的反应途径具有可调的组成，结构和表面化学性质，这些可以在未来的光伏中得到利用。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。