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Quantitative Compositional Profiling of Conjugated Quantum Dots with Single Atomic Layer Depth Resolution via Time-of-Flight Medium-Energy Ion Scattering Spectroscopy

Title
Quantitative Compositional Profiling of Conjugated Quantum Dots with Single Atomic Layer Depth Resolution via Time-of-Flight Medium-Energy Ion Scattering Spectroscopy
Authors
Jung, KW[Jung, Kang-Won]Yu, H[Yu, Hyunung]Min, WJ[Min, Won Ja]Yu, KS[Yu, Kyu-Sang]Sortica, MA[Sortica, M. A.]Grande, PL[Grande, Pedro L.]Moon, D[Moon, DaeWon]
DGIST Authors
Jung, KW[Jung, Kang-Won]; Moon, D[Moon, DaeWon]
Issue Date
2014-01-21
Citation
Analytical Chemistry, 86(2), 1091-1097
Type
Article
Article Type
Article
Keywords
Acceptance AngleCdSe/ZnS Quantum DotsCollection EfficiencyComputer SoftwareCore-Shell StructureDepth ProfilingDepth ResolutionLayer StructuresMedium Energy Ion ScatteringOrders of MagnitudePhotoelectronsSemiconductor Quantum DotsTransmission Electron MicroscopyX Ray Photoelectron SpectroscopyZinc Sulfide
ISSN
0003-2700
Abstract
We report the quantitative compositional profiling of 3-5 nm CdSe/ZnS quantum dots (QDs) conjugated with a perfluorooctanethiol (PFOT) layer using the newly developed time-of-flight (TOF) medium-energy ion scattering (MEIS) spectroscopy with single atomic layer resolution. The collection efficiency of TOF-MEIS is 3 orders of magnitude higher than that of conventional MEIS, enabling the analysis of nanostructured materials with minimized ion beam damage and without ion neutralization problems. The spectra were analyzed using PowerMEIS ion scattering simulation software to allow a wide acceptance angle. Thus, the composition and core-shell structure of the CdSe cores and ZnS shells were determined with a 3% composition uncertainty and a 0.2-nm depth resolution. The number of conjugated PFOT molecules per QD was also quantified. The size and composition of the QDs were consistent with those obtained from high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy, respectively. We suggest TOF-MEIS as a nanoanalysis technique to successfully elucidate the core-shell and conjugated layer structures of QDs, which is critical for the practical application of QDs in various nano- and biotechnologies. © 2013 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3127
DOI
10.1021/ac402753j
Publisher
American Chemical Society
Related Researcher
Files:
There are no files associated with this item.
Collection:
New BiologyETC1. Journal Articles


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