Abstract/Details

Surface-functionalized semiconducting nanoparticles in polymers: From self -assembly to functional materials


2007 2008

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Abstract (summary)

Seminconducting nanoparticles, also known as quantum dots or quantum rods depending on the shape, have unique optical and electronic properties. Polymers, on the other hand, have excellent processing properties. Therefore, it is desirable, in many cases, to integrate nanoparticles in polymers. The surface chemistry of nanoparticles is the key for them to be integrated into a polymer matrix in a controlled way. Nanoparticles are generally covered with alkyl ligands directly from typical synthetic procedures and surface modification is required to provide them with desired surface chemistry. First, water-soluble cadmium selenide (CdSe) nanoparticles and nanorods were made by modifying nanoparticle surfaces with charged ligands or poly(ethylene oxide) ligands and these water-soluble nanoparticles were selectively assembled into the holes and channels of nanotemplates fabricated from diblock copolymers.

Second, nanoparticle surfaces were functionalized with ligands (e.g., poly(ethylene oxide)) that were compatible with a polymer matrix (e.g., poly(methyl methacylate)) such that the nanoparticles were well-dispersed into the polymer matrix and a self-healing bilayer material was developed using these well-dispersed nanoparticle-filled polymer matrix.

Third, CdSe nanorods were oriented normal to a substrate in regioregular poly(3-hexylthiophene) matrix. However, the oriented CdSe nanorods were found to phase separate from poly(3-hexylthiophene) matrix. Then, chemistry was developed to synthesize vinyl-terminated poly(3-hexylthiophene) and Heck coupling was used to attach vinyl-terminated poly(3-hexylthiophene) (hole transporting material) onto aryl bromide-covered CdSe nanorods (electron transporting material) for photovoltaic applications. The poly(3-hexylthiophene) functionalized CdSe nanorods showed the expected charge transfer between these two semiconductors, a prerequisite for an efficient photovoltaic material.

Stimulated by the design of poly(3-hexylthiophene)-functionalized CdSe nanorods, donor-acceptor poly(3-hexylthiophene)-b-poly(perylene diimide acrylate) block copolymer was synthesized. This block copolymer also showed photoluminescence quenching in solid states.

Indexing (details)


Subject
Polymers
Classification
0495: Polymers
Identifier / keyword
Pure sciences; Cadmium selenide; Nanorods; Polymers; Self-assembly; Semiconducting nanoparticles
Title
Surface-functionalized semiconducting nanoparticles in polymers: From self -assembly to functional materials
Author
Zhang, Qingling
Number of pages
134
Publication year
2007
Degree date
2008
School code
0118
Source
DAI-B 69/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549663515
Advisor
Emrick, Todd; Russell, Thomas P.
Committee member
Barnes, Michael D.
University/institution
University of Massachusetts Amherst
Department
Polymer Science & Engineering
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3315473
ProQuest document ID
193720810
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/193720810
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