The Department of Physics cordially invites you to the following seminar:
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Title:
Structural and Optical Properties of ZnO Nanoparticles and Thin Films for OLED and Sensors
Speaker:
Professor Dr. Wan Haliza Binti Abd Majid
(Department of Physics, Faculty of Science, Universiti Malaya)
Date:
Friday July 26th 2024, 3:00 pm
Location:
BSFA, Department of Physics, Faculty of Science, Universiti Malaya
Abstract:
Zinc oxide (ZnO) nanoparticles were meticulously synthesized using Zinc Acetate Dihydrate
(Zn(CH 3 COOH) 2 .2H 2 O), Sodium Hydroxide (NaOH), deionized water, and ethanol to create
nanoparticles of varying crystal sizes. A wide array of characterization methods, including X-
ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), UV-Vis
spectroscopy, thickness measurements, and capacitance response, were employed to
comprehensively evaluate the structural, optical, and humidity sensing properties of the
nanoparticles. The crystal sizes were meticulously determined from the XRD peaks, and
their averages were calculated. Furthermore, the energy band gaps of the samples were
precisely calculated using Tauc's plot analysis. The photoluminescence emission peaks
were distinctly identified from the PL spectra, and the humidity sensing capabilities of the
created devices were carefully assessed through the study of capacitance response and
response lag. These comprehensive findings were pivotal in assessing the potential of the
synthesized ZnO nanoparticles for applications in organic light-emitting diodes (OLED) and
humidity sensors.
About The Speaker:
Wan Haliza Abd. Majid graduated with a bachelor’s in physics from the University
College of Wales, Aberystwyth, UK in 1988. In 1990-91, she worked as a tutor in the
Department of Physics at Universiti Malaya while completing her master's degree.
After obtaining her PhD from the University of Sheffield (UK) in 1994, she served as
a lecturer at the Matriculation Centre (PASUM) from 1994-2000, before transferring
to the Department of Physics at Universiti Malaya in 2000. Her research interest is
related to pyroelectric and ferroelectric properties of organic materials, fabrication,
and device characterization of an organic light-emitting diode (OLED) and photo-
sensing and signal processing of biomaterials, quantum dots, and their applications.
She has published her research work in more than 150 articles in refereed journals.
The work contributes to the development of new materials in composite and polymer
thin films for application in pyroelectric sensors, ferroelectric and piezoelectric
devices and advance of knowledge in the field of electronic transport theory,
mechanism, and materials for Organic Light Emitting Diodes (OLEDs) and Vertical
Organic Field Effect transistors (VOFET).
Thank you.
