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Sains Malaysiana 48(7)(2019): 1513–1518 http://dx.doi.org/10.17576/jsm-2019-4807-20
Reka Bentuk
Sensor Pendar Cahaya
Bintik Kuantum ZnCdSe untuk Mengesan
Racun Perosak
(Fluorescence Sensor Design for Pesticide
Detection using ZnCdSe Quantum Dots) NORHAYATI ABU
BAKAR*,
AKRAJAS
ALI
UMAR
& MUHAMAD MAT SALLEH Institute of Microengineering
and Nanoelectronics (IMEN), Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia Received:
9 January 2019/Accepted: 3 April 2019 ABSTRACT The pesticides are widely used
in the agricultural sector to increase crop production. However,
pesticides are considered as harmful chemicals to human health,
animal, fish and may cause environmental damage including water
pollution. This paper reports a study on the development of a fluorescent
sensor system to detect pesticides in water using ZnCdSe
quantum dots (QDs)
thin film. An optical sensing system was set up, comprises of four
components: light source to excite pesticide, sensor chamber that
contains the sample of pesticide, fiber optic to drive light from
source to sensor chamber, and analyzer system. The dual arms fiber
optic probe is for excitation and emission light paths. A glass
surface probe is coated with ZnCdSe QDs
thin film and attached at the end of the probe arm. ZnCdSe
QDs
was synthesized at 5 min of growth time using the wet chemical process
at 350°C. The detection of pesticide was done by comparing photoluminescence
(PL)
spectra of the ZnCdSe thin film in deionized
water and then in the pesticide solution. The concentration of pesticide
solution was prepared in water at 2.5 μg/L
to 2500 μg/L. The sensing experiment showed that the PL
peak spectrum of ZnCdSe
thin film was dropped after dipped in the pesticide solutions compared
with PL peak of ZnCdSe
dipped in the water. The percentage drop of PL peak
was increasing with the increasing of pesticide concentrations and
linearly depends on pesticide concentrations. Keywords: Fluorescence; pesticide;
quantum dots; sensor design system ABSTRAK Racun perosak digunakan secara meluas dalam
sektor pertanian
bagi meningkatkan hasil pengeluaran tanaman. Namun demikian, racun perosak boleh memudaratkan
kesihatan manusia,
haiwan, ikan dan
menyebabkan pencemaran
alam sekitar terutamanya
pencemaran air. Kertas
ini melaporkan kajian pembangunan sistem sensor pendar cahaya untuk mengesan
kehadiran racun
perosak di dalam air dengan menggunakan filem nipis bintik
kuantum. Sistem
sensor pendar cahaya mempunyai
empat bahagian:
sumber cahaya untuk
menguja racun
perosak, kebuk sensor yang mengandungi sampel racun perosak, serat optik yang memandu cahaya daripada sumber ke kebuk sensor dan sistem analisis.
Penduga serat
optik dupleks berfungsi
menyalurkan sumber
cahaya penguja dan pancaran. Pada
bahagian hujung
serat optik terdapat
permukaan kaca
pada penduga yang dimendapkan dengan filem nipis bintik
kuantum ternari
ZnCdSe yang disintesis menggunakan kaedah kimia basah pada
suhu 350°C dan
masa pertumbuhan hablur
ZnCdSe adalah 5 min. Pengesanan racun perosak diukur dengan membandingkan spektrum pendar cahaya (PL) filem
nipis ZnCdSe
di dalam air dan di dalam larutan racun
perosak dengan
variasi kepekatan 2.5 hingga 2500 μg/L. Pengesanan dalam uji kaji ini
menunjukkan spektrum
PL
filem nipis ZnCdSe
menurun apabila
dicelupkan ke dalam
larutan racun
perosak berbanding dengan puncak spektrum
di dalam air. Peratus
perbezaan penurunan PL
meningkat dengan peningkatan kepekatan racun perosak dan
bergantung secara
linear kepada kepekatan racun perosak. Kata kunci: Bintik
kuantum; pendar
cahaya; racun perosak;
reka bentuk
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