Sains Malaysiana 47(5)(2018): 1033–1038

http://dx.doi.org/10.17576/jsm-2018-4705-20

 

Peningkatan Kepekaan Biosensor Urea Berasaskan Resonans Plasmon Permukaan dan Tatasusunan Kretschmann dengan Struktur Hibrid Grafin-MoS₂

(Sensitivity Enhancement of Urea Biosensor based on Surface Plasmon Resonance and Kretschmann Configuration with Graphene- MoS₂ Hybrid Structure)

 

NUR AKMAR JAMIL, P. SUSTHITHA MENON*, GAN SIEW MEI & BURHANUDDIN YEOP MAJLIS

 

Institut Kejuruteraan Mikro dan Nanoelektronik (IMEN), Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 4 October 2017/Accepted: 29 November 2017

 

ABSTRAK

Artikel ini menganalisis biosensor resonans plasmon permukaan (SPR) dengan lapisan grafin yang meningkatkan kecekapan biosensor urea kerana penerapannya yang tinggi. Tatasusunan Kretschmann merupakan teknik yang paling berkesan digunakan untuk pengujaan plasmon. Dalam kajian ini, kami menganalisis kesan ekalapisan MoS₂ dengan lapisan grafin yang didepositkan pada bahan plasmon, iaitu logam emas (Au), di dalam tatasusunan ini. Simulasi untuk menganalisis tatasusunan ini adalah berdasarkan kepada kaedah perbezaan terhingga domain masa (FDTD). Prestasi biosensor SPR dapat dipantau dengan menganalisis kepekaan dan lebar penuh pada separuh maksimum (FWHM) spektrum SPR. Pengukuran diperhatikan pada panjang gelombang 670 nm dan 785 nm untuk pengesanan urea. Indeks molar dan indeks biasan berbeza (RI) daripada 1.335 sehingga 1.342 untuk lapisan penderiaan. Keputusan menunjukkan peratus peningkatan kepekaan biosensor Au/MoS₂/grafin berbanding biosensor Au konvensional adalah 98% dan 202% masing-masing pada panjang gelombang 670 nm dan 785 nm. Ini menunjukkan bahawa cadangan biosensor SPR yang novel ini adalah lebih sensitif untuk pengesanan urea.

 

Kata kunci: Biosensor urea; FWHM; resonans plasmon permukaan; simulasi FDTD; tatasusunan Kretschmann

 

ABSTRACT

The present paper analyses a surface plasmon resonance (SPR) biosensor based on graphene that leads to improvement on the efficiency of an urea biosensor due to high adsorption. Kretschmann configuration is well known as the most effectively used technique for plasmon excitation. In this work, we investigated the effect of MoS₂ with a fine layer of graphene deposited on a plasmonic material, gold (Au), into the configuration. Simulation is based on finite-difference time domain (FDTD) method for analysis. The performance of SPR biosensor can be monitored by analyzing the sensitivity and full width-at-half-maximum (FWHM) of the SPR spectrum. The measurements are observed at 670 and 785 nm for urea detection. The molarity and refractive index is varied from 1.335 to 1.342 for the sensing layer. The results showed that the percentage increase in sensitivity for the proposed biosensor Au/MoS₂/graphene over conventional biosensor Au is 98% and 202% at 670 and 785 nm, respectively, which indicates that the proposed novel SPR biosensor is better suited for urea detection.

 

Keywords: FDTD simulation; FWHM; Kretschmann configuration; surface plasmon resonance; urea biosensor

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*Corresponding author; email: susi@ukm.edu.my