Abstracts Book - IMRC 2018

• SF2-P004
LUMINISCENCE VARIATION IN AGING ZnO:Ag NANOCRYSTALS
OBTAINED BY ULTRASONIC SPRAY PYROLYSIS
Erick Velázquez Lozada. 1 , Tetyana Torchynska 2 , Gabriela Monserrat Camacho González 3
1 Instituto Politécnico Nacional - IPN, SEPI ESIME Zacatenco, Mexico. 2 Instituto Politécnico
Nacional - IPN, ESFM, Mexico. 3 Instituto Politécnico Nacional - IPN, ESIME Zacatenco, Mexico.
Scanning electronic microscopy (SEM), X ray diffraction (XRD) and
photoluminescence (PL) methods have been applied to the study the structural
and optical properties of ZnO:Ag nanorods prepared by the ultrasonic spray
pyrolysis (USP) method. The temperature and time variation at the growth of
ZnO:Ag films permits modifying the ZnO phase the amorphous to crystalline, to
change the size of ZnO:Ag nanorods as well as to vary their photoluminescence
spectra. With increasing the process duration to 10 min the ZnO recrystallization
and additional oxidation take place at the growth temperature,
which is more effective at 450 0 C than at 400 0 C. XRD show that crystal phase
appeared is wurzite with the parameters of hexagonal crystal lattice equal to a
= 3.2498 Å and c = 5.2066 Å. The size of ZnO nanocrystalls was estimated on the
base of SEM results. This size was equal to 50 – 150 nm in the dependence on
crystallization duration. PL spectra of ZnO:Ag nanorods are complex and can be
represented as a superposition of elementary PL bands with the peaks in the
spectral ranges: 2.90 – 3.25 eV (I), 2.10 – 2.80 eV (II) and 1.45 – 1.61 eV (III). The
UV-visible PL bands in ZnO are near-band-edge (NBE) or exciton (I) emission and
defect related emission (II). The nature of IR PL bands (III) has beed clarified. The
transformation of PL spectra at aging of ZnO Ag NCs in ambient air has been
discussed. The PL spectra of ZnO:Ag NRs over the temperature range 10 K to
300 K have been investigated as well.
Keywords: Luminiscence, Ultrasonic Spray Pyrolysis, Nanorods
Presenting authors email: gcamachogonzalez@gmail.com