Semiconductor nanostructures and nanoassemblies: a new perspective on their syntheses, properties and photophysical behaviour.

Banerjee, Chiranjib (2013) Semiconductor nanostructures and nanoassemblies: a new perspective on their syntheses, properties and photophysical behaviour. Doctoral thesis, University of East Anglia.

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Abstract

In the first part of this research, attempts have been made to use
single-molecule precursors [X2In(m-PR2)]2 (X = Me, CH2Ph; R = CMe3,
SiMe3) to generate nano-dimensional InP through thermal degradation.
Thermolysis of the di-tert-butyl precursors always led to In0, whereas, the
trimethylsilyl precursors formed In0 only in presence of hexadecylamine,
but in the absence of the amine could form InP nanoparticles.
Thermolysis of [(PhCH2)2InP(SiMe3)2]2, a new precursor, gives either InP
nanoparticles or nanowires, depending on the presence or absence of
stearic acid. This provided a simple and rapid method for the synthesis of
InP nanowires, for the first time, without the need of any protic coreagents
or surfactants. The wires were grown using the hot injection
technique and their formation relies on the SLS mechanism. We also
showed for the first time that the lengths of the nanowires can be
conveniently controlled by adjusting only the injection temperature and
were able to grow wires at a temperature as low as 160 ℃. Finally, the
indium metal at the base of each wire, an obvious outcome of the SLS
mechanism, can be easily removed under mild non-corrosive conditions.
The second part of the thesis describes attempts to couple group
II-VI (CdSe, ZnSe) quantum dots with subphthalocyanines (SubPcs) to
form hybrid nanoassemblies. The SubPcs chosen, carried pendant pyridyl
moieties for coordination to the nanoparticle surfaces. However, ZnSe
iii
did not show any ligand binding, whereas, CdSe formed a stable
complex, with an association constant either larger than or comparable
to previously reported values for other macrocycles. The QD : ligand ratio
was determined by a number of independent experimental methods (UV,
PL, NMR spectroscopy, quenching studies). The CdSe-SubPc formed an
efficient donor-acceptor system in terms of photophysical properties,
and energy flow within such systems was found to occur primarily
through FRET mechanism.

Item Type:	Thesis (Doctoral)
Faculty \ School:	Faculty of Science > School of Chemistry
Depositing User:	Users 2259 not found.
Date Deposited:	02 May 2013 11:11
Last Modified:	02 May 2013 11:11
URI:	https://ueaeprints.uea.ac.uk/id/eprint/42347
DOI:

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