Mid-infrared Intraband and Localized Surface Plasmon Resonance Spectroscopies of Doped Semiconductor Nanocrystals

掺杂半导体纳米晶体的中红外带内和局域表面等离子体共振光谱

• 批准号: 1954724
• 负责人: Masaru Kuno
• 金额: $ 48万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1954724&HistoricalAwards=false
• 关键词: Mid; infrared; Intraband; Localized; Surface

The Macromolecular, Supramolecular, and Nanochemistry Program in the Division of Chemistry supports Professor Masaru Kuno and his research group at the University of Notre Dame to study the optical properties of semiconductor nanocrystals. Molecules and semiconductor nanocrystals react with light to exhibit unique "fingerprints" that can be used in their identification. Professor Kuno's research contributes to the development of new analytical detection technologies for monitoring trace amounts of chemical and biological substances that are important to health, safety, and national security. Understanding fundamental optical properties of semiconductor nanocrystals also has implications in the development of low cost infrared cameras in cellphones and infrared detectors that can operate at room temperature. Professor Kuno and his group develop hands-on outreach activities such as thermal imaging kits to bring interest lower income and minority students in the South Bend Community School system in STEM careers. Recent advances in nanocrystal (NC) synthesis have enabled the development of stable, self-doped semiconductor NCs with significant doping densities. These NCs exhibit mid-infrared intrabands and localized surface plasmon resonances (LSPRs). However, little is understood about their dependence on the NC size, shape, surface chemistry, and doping density/dopant activation. This is due to the inhomogeneities present in doped NC ensembles, which is unavoidable in current colloidal NC syntheses. Limited means exist for conducting highly sensitive, mid-infrared optical measurements of single NCs. With this support from the Macromolecular, Supramolecular, and Nanochemistry Program in the Chemistry Division, Professor Kuno’s research team addresses this important need in the field. The research team employs a newly developed, super-resolution infrared absorption technique, called infrared photothermal heterodyne imaging (IR-PHI), to measure the local absorption of self-doped NCs. These measurements, in turn, can enable better understanding of the fundamental properties of these semiconductor NCs and of the evolution of intraband transitions into collective LSPRs at high doping densities.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.

化学系的大分子、超分子和纳米化学项目支持圣母大学Masaru Kuno教授和他的研究小组研究半导体纳米晶体的光学特性。分子和半导体纳米晶体与光发生反应，显示出独特的“指纹”，可用于识别它们。Kuno教授的研究有助于开发新的分析检测技术，用于监测对健康、安全和国家安全至关重要的微量化学和生物物质。了解半导体纳米晶体的基本光学特性也对开发可在室温下工作的低成本手机红外相机和红外探测器具有重要意义。Kuno教授和他的团队开发了诸如热成像工具包之类的实践外展活动，以使南本德社区学校系统中的低收入和少数民族学生对STEM职业感兴趣。纳米晶体（NC）合成的最新进展使得具有显著掺杂密度的稳定自掺杂半导体NC得以发展。这些NCs表现出中红外带内和局部表面等离子体共振（LSPRs）。然而，人们对它们与NC尺寸、形状、表面化学和掺杂密度/掺杂剂活化的关系知之甚少。这是由于掺杂数控系综中存在的不均匀性，这在当前的胶体数控合成中是不可避免的。对单个nc进行高灵敏度中红外光学测量的手段有限。在化学系大分子、超分子和纳米化学项目的支持下，Kuno教授的研究团队解决了该领域的这一重要需求。研究小组采用了一种新开发的超分辨率红外吸收技术，称为红外光热外差成像（IR-PHI），来测量自掺杂nc的局部吸收。这些测量反过来可以更好地理解这些半导体nc的基本特性，以及在高掺杂密度下带内跃迁到集体LSPRs的演变。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。

项目成果

Widefield infrared photothermal imaging and spectroscopy

宽场红外光热成像和光谱学

• DOI: 10.1117/12.2648082
• 发表时间: 2023
• 期刊: SPIE Proc. Advanced Chemical Microscopy for Life Science and Translational Medicine 2023
• 作者: Kniazev, Kirill;Zaitsev, Evgenii;Ngo, Loc;Zhang, Zhuoming;Kuno, Masaru K.
• 通讯作者: Kuno, Masaru K.

Hyperspectral and Nanosecond Temporal Resolution Widefield Infrared Photothermal Heterodyne Imaging

高光谱和纳秒时间分辨率宽场红外光热外差成像

• DOI: 10.1021/acsphotonics.3c00559
• 发表时间: 2023
• 期刊: ACS Photonics
• 影响因子: 7
• 作者: Kniazev, Kirill;Zaitsev, Evgenii;Zhang, Shubin;Ding, Yang;Ngo, Loc;Zhang, Zhuoming;Hartland, Gregory V.;Kuno, Masaru
• 通讯作者: Kuno, Masaru

Photothermal infrared imaging: identification and visualization of micro- and nanoplastics in environmental matrices

光热红外成像：环境基质中微米和纳米塑料的识别和可视化

• DOI: 10.1117/12.2577003
• 发表时间: 2021
• 期刊: Advanced Chemical Microscopy for Life Science and Translational Medicine 2021
• 作者: Pavlovetc, Ilia M.;Kniazev, Kirill;Kim, Junyeol;Doudrick, Kyle;Kuno, Masaru
• 通讯作者: Kuno, Masaru

Using Infrared Photothermal Heterodyne Imaging to Characterize Micro- and Nanoplastics in Complex Environmental Matrices

• DOI: 10.1021/acs.est.1c05181
• 发表时间: 2021-12-07
• 期刊: ENVIRONMENTAL SCIENCE & TECHNOLOGY
• 影响因子: 11.4
• 作者: Kniazev, Kirill;Pavlovetc, Ilia M.;Kuno, Masaru
• 通讯作者: Kuno, Masaru

Deep image restoration for infrared photothermal heterodyne imaging

• DOI: 10.1063/5.0071944
• 发表时间: 2021-12-07
• 期刊: JOURNAL OF CHEMICAL PHYSICS
• 影响因子: 4.4
• 作者: Zhang，Shuang;Kniazev，Kirill;Kuno，Masaru
• 通讯作者: Kuno，Masaru