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Microwave CVD
EM Modelling
Microwave Material interaction
Dielectric Properties
Dielectric Properties Measurement
Solid State Microwave
Microwave Processing
Microwave Chemistry
Microwave applicators design
Microwave Solvothermal Heating
Carbon quantum dots
Low-Pressurized synthesis
[EN] In this research, we ameliorated the problems of carbon quantum dots synthesis and
luminescence (quantum yields) by the novel synthesis protocol using microwave chemistry.
Specifically, we synthesized high quantum yields carbon quantum dots (61%) by utilizing a
microwave chemical synthesis, synthesizing at low pressure condition (lower than 5 atom)
and short reaction time (3 hrs). The achievement of this high quantum yields made it clear
that the contribution of polyethylene glycol (PEG) shell to carbon quantum dots is large. It
was confirmed from the DLS and TEM image that the particle size of the synthesized
particles was 8 to 13 nm. On the other hand, the relationship between the polymerization
degree of added PEG and the quantum yields to the addition amount is summarized. The
quantum yields of carbon quantum dots without addition of PEG was 16.7 %, while it was
improved at 61.1 % when 0.6 g of PEG 6000 (Molecular weight: 6000) was added.
Furthermore, we compared microwave with conventional method, and it was revealed that
higher luminescent and narrower sized carbon quantum dots were synthesized in microwave
heating than conventional method. This result presumably comes from the nature of
microwave selective heating of carbon precursor.
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
Abierto
http://hdl.handle.net/10251/130163
Editorial Universitat Politècnica de València
Satoshi Horikoshi
AMPERE 2019. 17th International Conference on Microwave and High Frequency Heating
Inglés
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