Ultrafast hole extraction from photoexcited colloidal CdSe quantum dots coupled to nitroxide free radicals

doi:10.1063/1.5124887

KMS > 物质科学与技术学院 > PI研究组 > John Andrew McGuire组

	Ultrafast hole extraction from photoexcited colloidal CdSe quantum dots coupled to nitroxide free radicals
	Dutta, Poulami 1; Tang, Yanhao 2; Mi, Chenjia 1; Saniepay, Mersedeh 1; McGuire, John A.2,3 ; Beaulac, Rémi 1
	2019
发表期刊	JOURNAL OF CHEMICAL PHYSICS (IF:3.1[JCR-2023],3.6[5-Year])
ISSN	0021-9606
卷号	151 期号:17
发表状态	已发表
DOI	10.1063/1.5124887
摘要	Organic free radicals related to the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical are known as photoluminescence-quenchers when coupled to group II-chalcogenide colloidal quantum dots (QDs), but the mechanism responsible for this phenomenon has so far remained unresolved. Using a combination of time-resolved photoluminescence and transient absorption spectroscopies, we demonstrate that photoexcited colloidal CdSe QDs coupled to 4-amino-TEMPO undergo highly efficient reductive quenching, that is, hole transfer from the valence band of the quantum dot to the organic paramagnetic species. Interestingly, the process is shown to occur on a subpicosecond time scale for bound 4AT; such a large rate constant for the extraction of holes from photoexcited CdSe QD by a molecular species is rare and underlines the potential that TEMPO derivatives can play in mediating efficient redox processes involving colloidal CdSe QDs. © 2019 Author(s).
收录类别	SCI ; SCIE ; EI
语种	英语
资助项目	Midwestern State University
出版者	American Institute of Physics Inc.
EI入藏号	20194607671477
EI主题词	Cadmium compounds ; Extraction ; Free radicals ; II-VI semiconductors ; Nanocrystals ; Photoluminescence ; Rate constants ; Selenium compounds
EI分类号	Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Operations:802.3
原始文献类型	Journal article (JA)
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/104314
专题	物质科学与技术学院_PI研究组_John Andrew McGuire组
通讯作者	McGuire, John A.
作者单位	1.Department of Chemistry, Michigan State University, East Lansing; MI; 48824-1322, United States 2.Department of Physics and Astronomy, Michigan State University, East Lansing; MI; 48824-1322, United States 3.School of Physical Science and Technology, ShanghaiTech University, Shanghai; 201210, China
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Dutta, Poulami,Tang, Yanhao,Mi, Chenjia,et al. Ultrafast hole extraction from photoexcited colloidal CdSe quantum dots coupled to nitroxide free radicals[J]. JOURNAL OF CHEMICAL PHYSICS,2019,151(17).
APA	Dutta, Poulami,Tang, Yanhao,Mi, Chenjia,Saniepay, Mersedeh,McGuire, John A.,&Beaulac, Rémi.(2019).Ultrafast hole extraction from photoexcited colloidal CdSe quantum dots coupled to nitroxide free radicals.JOURNAL OF CHEMICAL PHYSICS,151(17).
MLA	Dutta, Poulami,et al."Ultrafast hole extraction from photoexcited colloidal CdSe quantum dots coupled to nitroxide free radicals".JOURNAL OF CHEMICAL PHYSICS 151.17(2019).