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Cation Exchange Reactions in Semiconductor Nanocrystals

Klinkova, Anna
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1308392960

Abstract Details

2011, Master of Science (MS), Bowling Green State University, Chemistry.
Chemical transformation of existing inorganic nanostructures from one material into another by means of cation exchange represents a straightforward, facile, and effective approach to nanomaterial synthesis. This approach has received increasing attention in recent years. The general overview of recent developments in synthesis and chemical modification of nanomaterials with a focus on cation exchange reactions is presented in the chapter I of this work. Subsequently, two projects of our research group, which employ this method for synthetic purposes, are being described. First, a simple strategy for low-temperature processing of colloidal nanocrystals into all-inorganic solid films, deployable for photovoltaic applications, is presented. The method relies on encapsulation of semiconductor nanocrystal arrays with a matrix of a wide-band gap inorganic material, which preserves optoelectronic properties of individual nanoparticles, yet, renders the nanocrystal film highly photoconductive. Second, hot-injection synthesis of colloidal nanocrystals (NCs) in a substrate-bound form is demonstrated. We show that polycrystalline films submerged into hot organic solvents can nucleate the heteroepitaxial growth of semiconductor NCs, for which the ensuing lattice quality and size distribution are on the par with those of isolated colloidal nanoparticles. This strategy is demonstrated by growing lead chalcogenide NCs directly onto solvent-submerged TiO2 substrates. The resulting PbS/TiO2 nanocomposites exhibit heteroepitaxial interfaces between lead chalcogenide and oxide domains and show an efficient separation of photoinduced charges, deployable for light-harvesting applications. The extendibility of the present method to other material systems was demonstrated through the synthesis of CdS/TiO2 and Cu2S/TiO2 heterostructures, fabricated from PbS/TiO2 composite via cation exchange.
Thomas Kinstle, PhD (Advisor)
Mikhail Zamkov, PhD (Committee Member)
Ksenija Glusac, PhD (Committee Member)
50 p.
Chemistry
nanochemistry; quantum dots

Recommended Citations

Citations

  • Klinkova, A. (2011). Cation Exchange Reactions in Semiconductor Nanocrystals [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1308392960

    APA Style (7th edition)

  • Klinkova, Anna. Cation Exchange Reactions in Semiconductor Nanocrystals. 2011. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1308392960.

    MLA Style (8th edition)

  • Klinkova, Anna. "Cation Exchange Reactions in Semiconductor Nanocrystals." Master's thesis, Bowling Green State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1308392960

    Chicago Manual of Style (17th edition)

bgsu1308392960
3,136
© 2011, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.