Optical vibrational modes in (Cd, Pb, Zn)S quantum dots embedded in Langmuir–Blodgett matrices

Milekhin, A. G.; Sveshnikova, L. L.; Repinsky, S.M.; Gutakovsky, A.K.; Friedrich, M.; Zahn, Dietrich R. T.

doi:10.1016/s0040-6090(02)00991-4

Cited by 35 publications

(20 citation statements)

References 12 publications

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“…These data are in accordance with our previous results obtained for CdS, ZnS, and PbS QDs [20]. ZnO QDs have a half-spherical shape with a base size of about 40 nm and a QD height of about 4 nm.…”

Section: Resultssupporting

confidence: 93%

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

et al. 2012

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Section: Resultssupporting

confidence: 93%

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

et al. 2012

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“…20 However, because Qdots are expected to behave differently than amphiphilic lipid molecules at an air-water interface, 21,22 concern has naturally arisen regarding the stability and reproducibility of Qdot Langmuir films. 8,9,[23][24][25] Qdot surface-capping ligands significantly influence Langmuir film formation and stability. 18,26,27 When Qdot surfaces are wetted sufficiently at the air -water interface, they can transfer into the subphase.…”

mentioning

confidence: 99%

Capping-Ligand Effect on the Stability of CdSe Quantum Dot Langmuir Monolayers

Radhakrishnan

Knobler

et al. 2011

Langmuir

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The stability of Langmuir monolayers of CdSe Qdots capped with dodecan-ethiol (DDT), with dithiocarbamates having one, two, or three long alkyl chains (DTC-1, DTC-2 and DTC-3) or with tri-n-octylphosphine oxide (TOPO), was investigated and linked to the transport of Qdots into the subphase via a dissolution and diffusion mechanism. Langmuir films of Qdots were created by depositing droplets of purified Qdots in chloroform at the air-water interface. While holding the Qdot films at 13 mN/m for 1 h in a Langmuir trough, the average monolayer areas decreased by roughly 9% for TOPO-capped Qdots, ∼15-18% for the three DTC-capped Qdot preparations, and ∼21% for DDT-capped Qdots. Using the model of Ter Minassian-Saraga, the relative stabilities of the Qdot films studied were related to differences in equilibrium partitioning into the subphase and to apparent Qdot diffusivities within the subphase. An analysis of the Qdot preparations by Fourier-transform infrared spectroscopy (FTIR) revealed that the aliphatic tails of capping ligands were assembled on Qdot surfaces with similar packing densities for all ligand chemistries. A combined analysis of the film-area contraction and FTIR data suggested that, for the chemistries examined in this study, both the capping-ligand headgroup and the aliphatic tail groups impact Qdot Langmuir film stability through their joint influence on nanoparticle wettability and the tendency to aggregate upon partitioning into the subphase.

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“…So LB¯lm is extremely thin (within nanometer) and has a high degree of structural order. 18 Nowadays, LB technique has been widely used to fabricate monolayer 19,20 and many possible applications have been suggested for this. 21À24 Also because of its well-ordered features, there have been many studies on the preparation of inorganic¯lms by LB technique.…”

Section: Introductionmentioning

confidence: 99%

FABRICATION AND OPTOELECTRONIC PROPERTIES OF Mg_xZn_1-xO ULTRATHIN FILMS BY LANGMUIR–BLODGETT TECHNOLOGY

2012

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By transferring Mg x Zn 1Àx O sol and stearic acid onto a hydrophilic silicon wafer or glass plate, the LangmuirÀBlodgett (LB) multilayers of Mg x Zn 1Àx O (x:0, 0.2, 0.4) were deposited. After calcinations at 350 C for 0.5 h and at 500 C for 3 h, Mg x Zn 1Àx O ultrathin¯lms were fabricated. The optimized parameters for monolayer formation and multilayer deposition were determined by the surface pressure-surface (Å-A) area and the transfer coe±cient, respectively. The expended areas of stearic acid with Mg x Zn 1Àx O sols under Å-A isotherms inferred the interaction of stearic acid with Mg x Zn 1Àx O sols during the formation of monolayer at airÀwater interface. X-ray di®raction (XRD) was used to determine the crystal structures of Mg x Zn 1Àx O nanoparticles and ultrathin¯lms. The surface morphologies of Mg x Zn 1Àx O ultrathin¯lms were observed by scanning probe microscopy (AFM). And the optoelectronic properties of Mg x Zn 1Àx O were detected and discussed based on photoluminescence (PL) spectra.

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Optical vibrational modes in (Cd, Pb, Zn)S quantum dots embedded in Langmuir–Blodgett matrices

Cited by 35 publications

References 12 publications

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

Capping-Ligand Effect on the Stability of CdSe Quantum Dot Langmuir Monolayers

FABRICATION AND OPTOELECTRONIC PROPERTIES OF Mg_xZn_1-xO ULTRATHIN FILMS BY LANGMUIR–BLODGETT TECHNOLOGY

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Optical vibrational modes in (Cd, Pb, Zn)S quantum dots embedded in Langmuir–Blodgett matrices

Cited by 35 publications

References 12 publications

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

Resonant Raman scattering of ZnS, ZnO, and ZnS/ZnO core/shell quantum dots

Capping-Ligand Effect on the Stability of CdSe Quantum Dot Langmuir Monolayers

FABRICATION AND OPTOELECTRONIC PROPERTIES OF MgxZn1-xO ULTRATHIN FILMS BY LANGMUIR–BLODGETT TECHNOLOGY

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FABRICATION AND OPTOELECTRONIC PROPERTIES OF Mg_xZn_1-xO ULTRATHIN FILMS BY LANGMUIR–BLODGETT TECHNOLOGY