Doctoral Dissertations

Author

Prachi Desai

Keywords and Phrases

Core -shell; Hexadecylamine; Superparamagnetism

Abstract

"This dissertation study focuses on developing new protocols for synthesis of nanostructured transition-metal pnictides including superconducting LiFeAs and studying their structure- property relationship. Nanostructured materials are known to differ in properties compared to their bulk counterparts owing to enhanced surface area and increased packing efficiency in devices. Synthetic chemistry skills and nanofabrication techniques like wet chemistry, electrodeposition, solvothermal, hydrothermal and lithography, are extremely useful for creating nanostructures of these functional materials. This is a challenging task simply because maintaining the phase composition same as that of the bulk material along with achieving nanostructures (nanoparticles, nanowires, nanopillars etc.) simultaneously is not easy. Papers I and II showcase novel synthesis methods for E based pnictides [EPn where E = 1st row transition elements and Pn = P, As etc.]. The superparamagnetism of transition-metal pnictides (e.g. FeAs, CoAs) nanomaterials obtained by this method have interesting magnetic features like high blocking temperatures and inter-particle magnetic exchange. Paper III, shows the concept of generalized protocol of EAs synthesis and discusses the principles behind this method. This protocol has been tested for applicability to not only FeAs, but also MnAs ,CoAs and CrAs systems. Generalization of this method along with the discovery of superparamagnetic behavior in FeAs is one of the key findings of this research work. Alongside, paper IV shows the formation of CO₃O₄ nanowires through solid-solid conversion route aided by sacrificial templates"--Abstract, page iv.

Advisor(s)

Nath, Manashi

Committee Member(s)

Huebner, Wayne
Switzer, Jay A., 1950-
Stavropolous, Pericles
Winiarz, Jeffery G.

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2014

Journal article titles appearing in thesis/dissertation

  • Soft chemical synthetic route to superparamagnetic FeAs@C core-shell nanoparticles exhibiting high blocking temperature
  • Synthesis and magnetic properties of superparamagnetic CoAs nanostructures
  • A generalized protocol for synthesis of nanostructured transition metal arsenides
  • One pot synthesis of Co(CO₃)₀.₅ OH 0.11 H₂O nanowires and their conversion to Co₃O₄ nanowires

Pagination

xi, 140 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2014 Prachi Desai, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Arsenides -- Synthesis
Nanostructures -- Synthesis
Transition metal compounds -- Synthesis

Thesis Number

T 10528

Electronic OCLC #

894225521

Included in

Chemistry Commons

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