Journal: The Journal of Physical Chemistry C

Abbreviation

J. Phys. Chem. C

Publisher

American Chemical Society

Journal Volumes

ISSN

1932-7455
1932-7447

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Publications 1 - 10 of 316
  • Energy Transfer between Inorganic Perovskite Nanocrystals
    Item type: Journal Article
    de Weerd, Chris; Gomez, Leyre; Zhang, Hong; et al. (2016)
    The Journal of Physical Chemistry C
    Cesium lead halide nanocrystals are a new attractive material for optoelectronic applications since they combine the advantageous properties of perovskites and quantum dots. For future applications in optoelectronics and photovoltaics, an efficient energy and/or carrier exchange is a necessary condition. Here, we explicitly demonstrate nonradiative energy transfer for colloidal CsPbBr3 nanocrystals. Using time-resolved optical characterization of purposefully prepared batches of nanocrystals with different sizes, we identify the energy transfer which can be driven by the concentration gradient of excited nanocrystals as well as by the bandgap energy difference. The latter process moves the energy from smaller to larger nanocrystals and opens a possibility of directional streaming of the excitation energy in these materials. The observed energy transfer is enabled in the colloids by proximity of individual nanocrystals due to clustering.
  • Spin-Glass Behavior and Electronic Structure of LiEu2Si3
    Item type: Journal Article
    Cuervo Reyes, Eduardo; Slabon-Turski, Adam; Mensing, Christian; et al. (2012)
    The Journal of Physical Chemistry C
    The electronic structure and properties of LiEu2Si3 are investigated, using ab initio methods and experimental techniques. All europium ions are found in a 8S7/2 configuration. The system is metallic. We found evidence of competing exchange interactions between Eu moments which may result in the onset of a spin-glass behavior below 70 K. The electronic structures of LiEu2Si3 and the isostructural (inexistent) LiSr2Si3 are compared. The ambiguous role of lithium is discussed. The fact that LiEu2Si3 and LiSr2Si3 crystallize in different structure types is justified here, considering their relative thermodynamical stability and the difference between the effective charges of europium and strontium.
  • Ensemble Effect Evidenced by CO Adsorption on the 3-Fold PdGa Surfaces
    Item type: Journal Article
    Prinz, Jan; Gaspari, Roberto; Stoeckl, Quinn S.; et al. (2014)
    The Journal of Physical Chemistry C
  • The Jahn-Teller Effect in Cu(II) Doped MgO
    Item type: Journal Article
    Dick, Andres; Krausz, Elmars R.; Hadler, Kieran S.; et al. (2008)
    The Journal of Physical Chemistry C
  • Revisiting Edge Sites of γ-Al2O3 Using Needle-Shaped Nanocrystals and Recoupling-Time-Encoded {27Al}-1H D-HMQC NMR Spectroscopy
    Item type: Journal Article
    Völker, Laura A.; Meyet, Jordan; Berkson, Zachariah J.; et al. (2022)
    The Journal of Physical Chemistry C
    Despite being widely used in numerous catalytic applications, our understanding of reactive surface sites of high-surface-area γ-Al2O3 remains limited to date. Recent contributions have pointed toward the potential role of highly reactive edge sites contained in the high-field signal (−0.5 to 0 ppm) of the 1H NMR spectrum of γ-Al2O3 materials. This work combines the development of well-defined, needle-shaped γ-Al2O3 nanocrystals having a high relative fraction of edge sites with the use of state-of-the-art solid-state NMR to significantly deepen our understanding of this specific signal. We are able to resolve two hydroxyl sites with distinct isotropic chemical shifts of −0.2 and −0.4 ppm and different positions within the dipole–dipole network from 1H–1H single-quantum double-quantum NMR. Moreover, the use of recoupling-time-encoded arbitrary-indirect-dwell dipolar heteronuclear multiple quantum coherence allows us to partially revise previous assignments for surface-aluminum sites in the proximity of these hydroxyl sites. Although previous work has ascribed the high-field signal to be correlated with a single four-coordinate Al-site with a substantial quadrupolar broadening of >10 MHz, we can identify the presence of two four-coordinate Al-sites with similar isotropic chemical shifts but different quadrupolar coupling constants of approximately 7 and >10 MHz, respectively. Recoupling-time-encoded data are thus able to differentiate sites that would otherwise only be achievable with access to multiple fields or usage of highly advanced NMR techniques.
  • LiSr2-xEuxGe3: Light on the Europium Site Preferences
    Item type: Journal Article
    Cuervo-Reyes, Eduardo; Mensing, Christian; Slabon, Adam (2016)
    The Journal of Physical Chemistry C
  • The First Halide-Free Bimetallic Aluminum Borohydride: Synthesis, Structure, Stability, and Decomposition Pathway
    Item type: Journal Article
    Dovgaliuk, Iurii; Ban, Voraksmy; Sadikin, Yolanda; et al. (2014)
    The Journal of Physical Chemistry C
  • A Compositional Window of Kinetic Stability for Amphiphilic Polymers and Colloidal Nanorods
    Item type: Journal Article
    Jeng, Esther S.; Shih, Chih-Jen; Barone, Paul W.; et al. (2011)
    The Journal of Physical Chemistry C
  • Flying and crawling modes during surface-bound single wall carbon nanotube growth
    Item type: Journal Article
    Pisana, Simone; Jungen, Alain; Zhang, Can; et al. (2007)
    The Journal of Physical Chemistry C
  • Fluorescence Enhancement with the Optical (Bi-) Conical Antenna
    Item type: Journal Article
    Mohammadi, Ahmad; Kaminski, Franziska; Sandoghdar, Vahid; et al. (2010)
    The Journal of Physical Chemistry C
Publications 1 - 10 of 316