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Core-shell nanoparticles by photolysis of a metalorganic precursor

Oravainen, Lauri LU (2024) FYSK03 20231
Department of Physics
Solid State Physics
Abstract (Finnish)
Nanoteknologialla ja nanohiukkasilla on useita sovelluksia, mukaan lukien esim. biolääketiede, tiedontallennuslaitteet, ympäristötutkimus, materiaalitiede ja energian varastointi. Tässä työssä tutkitaan pinnoitettuja nanohiukkasia, joiden ydin ja kuori koostuvat eri alkuaineista. Tarvitaan menetelmä, jolla tuottaa tällaisia hiukkasia säännöllisin mitoin ja muodoin. Tutkimme niiden valmistusta prosessissa, jossa ultraviolettivalo katkaisee trimetyyli-indium-molekyylin sidokset ja vapauttaa indiumatomin, joka tiivistyy kuoreksi kultahiukkasen ympärille. Mittaamme syntyneiden hiukkasten kokoa liikkuvuus- eli kokosuodattimella ja hiukkaslaskurilla. Selvitämme, miten tulokset vaihtelevat eri koeparametrien, esim. kunkin kokeen aloittamisesta... (More)
Nanoteknologialla ja nanohiukkasilla on useita sovelluksia, mukaan lukien esim. biolääketiede, tiedontallennuslaitteet, ympäristötutkimus, materiaalitiede ja energian varastointi. Tässä työssä tutkitaan pinnoitettuja nanohiukkasia, joiden ydin ja kuori koostuvat eri alkuaineista. Tarvitaan menetelmä, jolla tuottaa tällaisia hiukkasia säännöllisin mitoin ja muodoin. Tutkimme niiden valmistusta prosessissa, jossa ultraviolettivalo katkaisee trimetyyli-indium-molekyylin sidokset ja vapauttaa indiumatomin, joka tiivistyy kuoreksi kultahiukkasen ympärille. Mittaamme syntyneiden hiukkasten kokoa liikkuvuus- eli kokosuodattimella ja hiukkaslaskurilla. Selvitämme, miten tulokset vaihtelevat eri koeparametrien, esim. kunkin kokeen aloittamisesta kuluneen ajan, mukaan.
Vahvistimme, että menetelmä on periaatteessa toimiva, mutta emme kyenneet keräämään riittävästi luotettavia mittauksia hiukkasten koosta. Indiumin tiivistyminen estyi, kun sitä kuljettava putkisto tukkeutui, mikä havaittiin vasta kokeen loppuvaiheessa. (Less)
Abstract
Nanotechnology and nanoparticles have applications in biomedicine, data storage, environmental research, materials science and energy storage, to name a few examples. Core-shell nanoparticles consist of a sphere of one material surrounded by a shell of a different material. There is a need for a method that produces core-shell particles of predictable dimensions. We investigate their production via the method of using ultraviolet light to break the bonds of a trimethylindium molecule and letting the freed indium atom form a shell on a gold particle in a nitrogen gas suspension. We measure the size of the resultant core-shell particles using a differential mobility analyzer and a condensation particle counter. We investigate how results... (More)
Nanotechnology and nanoparticles have applications in biomedicine, data storage, environmental research, materials science and energy storage, to name a few examples. Core-shell nanoparticles consist of a sphere of one material surrounded by a shell of a different material. There is a need for a method that produces core-shell particles of predictable dimensions. We investigate their production via the method of using ultraviolet light to break the bonds of a trimethylindium molecule and letting the freed indium atom form a shell on a gold particle in a nitrogen gas suspension. We measure the size of the resultant core-shell particles using a differential mobility analyzer and a condensation particle counter. We investigate how results vary by different experimental parameters, including the elapsed time since the commencement of each experiment session.

We confirmed that the method essentially works, but were unable to gather reliable data for particle size as governed by the different variables. The experiment apparatus suffered a blockage of the trimethylindium tubes that was not discovered until the end of the experiment phase. (Less)
Please use this url to cite or link to this publication:
author
Oravainen, Lauri LU
supervisor
organization
course
FYSK03 20231
year
type
M2 - Bachelor Degree
subject
keywords
nanoparticle, photolysis, spark ablation, spark discharge generator, trimethylindium, aerosol
language
English
id
9144779
date added to LUP
2024-12-19 13:06:15
date last changed
2024-12-19 13:06:15
@misc{9144779,
  abstract     = {{Nanotechnology and nanoparticles have applications in biomedicine, data storage, environmental research, materials science and energy storage, to name a few examples. Core-shell nanoparticles consist of a sphere of one material surrounded by a shell of a different material. There is a need for a method that produces core-shell particles of predictable dimensions. We investigate their production via the method of using ultraviolet light to break the bonds of a trimethylindium molecule and letting the freed indium atom form a shell on a gold particle in a nitrogen gas suspension. We measure the size of the resultant core-shell particles using a differential mobility analyzer and a condensation particle counter. We investigate how results vary by different experimental parameters, including the elapsed time since the commencement of each experiment session.

We confirmed that the method essentially works, but were unable to gather reliable data for particle size as governed by the different variables. The experiment apparatus suffered a blockage of the trimethylindium tubes that was not discovered until the end of the experiment phase.}},
  author       = {{Oravainen, Lauri}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Core-shell nanoparticles by photolysis of a metalorganic precursor}},
  year         = {{2024}},
}