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

 

Diserahkan: 9 Januari 2019/Diterima: 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 sistem sensor

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*Pengarang untuk surat-menyurat; email: norhayati.ab@ukm.edu.my

 

 

 

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