Composition Control and Localization of S²⁻ in CdSSe Quantum Dots Grown from Li₄[Cd₁₀Se₄(SPh)₁₆]

• Other Authors: Oyler, Ryan Edward (authoraut)
• Format: Others
• Language: English; English
• Published: Florida State University
• Subjects: Biochemistry; Biophysics; Molecular biology; Chemistry
• Online Access: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2437

Reproduced with permission from Journal of the American Chemical Society, submitted for publication. Unpublished work copyright 2008 American Chemical Society. The development of ternary nanoscale materials with controlled cross-sectional doping is an important step in the use of chemically prepared quantum dots for nanoscale engineering applications. We report cross-sectional, elemental doping for the formation of an alloyed CdSSe nanocrystal. The nanocrystal is prepared from the thermal decomposition of Li4[Cd10Se4(SPh)16]. The sulfur incorporation arises from a surface mediated degradation of a [Cd(SPh)4]2- tetrahedral passivant tightly bound to the growing quantum dot surface. In the alloy, we identify a pure CdSe nucleus of ~ 1.5 nm consistent with the predictions of nucleation theory. As the particle grows, S2- incorporation increases until ~3.5 nm, at which point an equilibrium of the S2-/Se2- incorporation rate is attained. The use of molecular clusters to allow controlled defect ion incorporation can open new pathways to more complex nanomaterials. === A Thesis Submitted to the Department of Chemistry and Biochemistry in Partial Fulfillment of the Requirements for the Degree of Masters of Science. === Fall Semester, 2008. === October 28, 2008. === Nanocrystals, CdSSe, Quantum Dots === Includes bibliographical references. === Geoffrey F. Strouse, Professor Directing Thesis; Sanford A. Safron, Committee Member; Oliver Steinbock, Committee Member.