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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
- Quantitative Compositional Profiling of Conjugated Quantum Dots with Single Atomic Layer Depth Resolution via Time-of-Flight Medium-Energy Ion Scattering Spectroscopy
- 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
- Analytical Chemistry, 86(2), 1091-1097
- Article Type
- Acceptance Angle; CdSe/ZnS Quantum Dots; Collection Efficiency; Computer Software; Core-Shell Structure; Depth Profiling; Depth Resolution; Layer Structures; Medium Energy Ion Scattering; Orders of Magnitude; Photoelectrons; Semiconductor Quantum Dots; Transmission Electron Microscopy; X Ray Photoelectron Spectroscopy; Zinc Sulfide
- 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.
- American Chemical Society
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