Sains Malaysiana 40(3)(2011): 231–235

Detection of Volatile Organic Compound Gas Using Localized Surface Plasmon Resonance of Gold Nanoparticles

(Pengesanan Gas Sebatian Organik Mudah Meruap Menggunakan Resonans Plasmon Permukaan Tempatan Nanozarah Emas)

Sri Nengsih, Akrajas Ali Umar* & Muhamad Mat Salleh

Institute of Microengineering and Nanoelectronic (IMEN), Universiti Kebangsaan Malaysia

43600, Bangi, Selangor D.E., Malaysia

Muhammad Yahaya

School of Applied Physics, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor D.E., Malaysia

Diserahkan: 15 Mei 2010 / Diterima: 3 September 2010

ABSTRACT

This paper reports on the detection of several organic vapors using the unique characteristic of localized surface plasmon resonance (LSPR) gold nanoparticles. Gold nanoparticles on quartz substrate were prepared using seed mediated growth method. In a typical process, gold nanoparticles with average size ca. 36 nm were obtained to densely grown on the substrate. Detection of gas was based on the change in the LSPR of the gold nanoparticles film upon the exposure to the gas sample. It was found that gold nanoparticles were sensitive to the presence of volatile organic compound (VOC) gas from the change in the surface plasmon resonance (SPR) intensity. The mechanism for the detection of VOC’s gas will be discussed.

Keywords: Gold nanoparticles; LSPR; VOC gas

ABSTRAK

Kertas ini melaporkan tentang pengesanan beberapa wap organik menggunakan sifat khas daripada resonans plasma permukaan tempatan (LSPR) nanozarah emas. Nanozarah emas yang difabrikasi pada permukaan substrat kuarza telah disediakan melalui kaedah penumbuhan dengan pengantara benih. Pada proses tipikal, nanozarah emas dengan saiz purata 36 nm telah dihasilkan dan tumbuh dengan padat pada permukaan substrat. Pengesanan gas sebatian organik mudah meruap adalah berdasarkan kepada perubahan LSPR pada filem nanozarah emas apabila didedahkan terhadap sampel gas. Didapati bahawa filem nanozarah emas menunjukkan kepekaan terhadap kehadiran gas sebatian organik mudah meruap melalui perubahan puncak serapan resonans plasmon permukaan (SPR). Mekanisme pengesanan gas sebatian organik mudah meruap akan diperbincangkan.

Kata kunci: Gas mudah meruap; LSPR; nanozarah emas

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*Pengarang untuk surat-menyurat; email: akrajas@ukm.my