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Self Sustained Size Focusing of Colloidal Semiconductor Nanocrystals and their Programmable Assembly

Sundrani, Nida
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1586443112680016

Abstract Details

2020, Master of Science (MS), Bowling Green State University, Physics.
Digestive ripening (DR) represents a powerful approach for improving the size uniformity of colloidal nanostructures. This relies on favorable growth of smaller nanoparticles over the larger ones in presence of a ligand. Despite its successful application to size-focusing of metal colloids, digestive ripening of semiconductor nanocrystal has received little attention to date. Here, we demonstrate that ligand-induced ripening of semiconductor nanocrystal lies in the thermally activated particle coalescence, which leads to a significant increase in the nanocrystal size for temperatures above the threshold value (Tth = 200–220 °C). Below this temperature, nanoparticle sizes focus to an ensemble average diameter just like in the case of metal colloids. The existence of the thermal threshold for coalescence serves as an opportune strategy for controlling both the particle size and the size dispersion. Similarly, to digestive ripening, during coalescence a ligand exchange is performed that enables the growth of nanocrystals at a relatively lower temperatures and assemble into hybrid multifunctional nanostructures. While low temperature-based DR is a bilateral strategy for controlling the shape and surface-ligand chemistry of semiconductor crystals. The integration of nanostructures can enable the cooperation if different properties which include catalytic, plasmonic and other characteristics. The potential benefits of multifunctional assemblies are best illustrated in the field of supramolecular chemistry, where the conjugation of discrete molecules leads to high efficiency catalysts and biosensors. Similar advantages are expected from assemblies of inorganic nanocrystals, where a broad range of complementing functionalities could be achieved.
Mikhail Zamkov (Advisor)
Lewis Fulcher (Committee Member)
Alexey Zayak (Committee Member)
72 p.
Physics
Digestive ripening, Size focusing; Coalescence

Recommended Citations

Citations

  • Sundrani, N. (2020). Self Sustained Size Focusing of Colloidal Semiconductor Nanocrystals and their Programmable Assembly [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1586443112680016

    APA Style (7th edition)

  • Sundrani, Nida. Self Sustained Size Focusing of Colloidal Semiconductor Nanocrystals and their Programmable Assembly. 2020. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1586443112680016.

    MLA Style (8th edition)

  • Sundrani, Nida. "Self Sustained Size Focusing of Colloidal Semiconductor Nanocrystals and their Programmable Assembly." Master's thesis, Bowling Green State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1586443112680016

    Chicago Manual of Style (17th edition)

bgsu1586443112680016
282
© 2020, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.