Abstracts Book - IMRC 2018

• SB4-P010
SYNTHESIS OF CARBON DOTS FROM ORGANIC PRECURSORS
Itzel Arizbe Olivares Torres 1 , Santos Jesús Castillo 2 , Josefina Alvarado Rivera 1
1 Universidad de Sonora, Physics, Mexico. 2 Universidad de Sonora, Department of Research in
Physics, Mexico.
Carbon quantum dots (CDs) have taken great notoriety due their formation and
dispersion in aqueous medium, and strong luminescence. They are an
ecofriendly alternative by their bening nature, abundance and facile obtention
natural precursors such as citrics, green leaves, etc. In this work hydrothermal
synthesis is used to obtain carbon quantum dots with orange juice and spinachs
as carbon source. Hexamethilentretamine (HMTA) and triethanolamine (TEA)
are used for nitrogen doping. This method consists in an organic precursor
solution in a hermetic container, with or without amine. Then is taken to a
furnace in 120 °C by 2.5 h. When finished process, the obtained solution is
cooled at room temperature and posteriorly washed to separate the quantum
dots coarse particles. The morphology and structure were characterized by
transmission electron microscopy (TEM). The average interlayer spacing in
orange juice CDs was 3.40 Å, and in spinach CDs was 3.50 Å, corresponding to
reported in literature for carbon quantum dots. UV-vis spectroscopy had been
used to analyze their optical absorption behavior and determine the changes
made by nitrogen doping. Photoluminescence response to different excitation
wavelength and the effect of amine group precursor were evaluated. In orange
juice CDs the maximum emission peak was around 460 nm at λex= 380 nm,
which shifts to 450 nm at λex= 360 nm with HMTA doping and 445 nm at λex= 350
nm with TEA doping. In spinach CDs the maximum was around 435 nm at λex=
340 nm, with HMTA doping it shifts to 440 nm at λex= 340 nm and 480 nm at λex=
360 nm with TEA doping.
Acknowledgment:
We gratefully acknowledge the use of TEM facilities at the TEM Laboratory of
Universidad de Sonora, also we acknowledge to Posgrado en Nanotecnología
for the facilities in the use of UV-vis and PL spectroscopy equipment. IAOT
gratefully acknowledge the financial support to Conacyt.
Keywords: quantum dots, carbon, luminescence
Presenting authors email: itariz.olive@outlook.com