Sains Malaysiana 37(3):  249-253 (2008)

Tio₂ Nanoparticles Coated With Porphyrin Dye Thin

Film As Fluorescence Gas Sensor

(Nanozarah TiO₂ Bersalut Filem Nipis Porifinin Sebagai

Pengesan Gas Pendarflour)

Nurul Huda Yusoff, Muhamad Mat Salleh

Institute of Microengineering and Nanoelectronics

Universiti Kebangsaan Malayisa, 43600 Bangi, Selangor

Malaysia

Muhammad Yahaya

School of Applied Physics, Faculty of Science & Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor

Malaysia

Received:  12 June 2007/ Accepted: 4 December 2007

ABSTRACT

This research explores the possibility of using fluorescence technique to detect the presence of volatile organic compounds based on a single sensing material. The material used was TiO₂ nanoparticles coated with porphyrin dye. The TiO₂ nanoparticles colloid is in a sol-gel form synthesized from titanium (IV) ethoxide in ethanol with addition of kalium chloride (KCl) as stabilizer. TiO₂ nanoparticles were then coated with porphyrin dye, Manganase (III) 5,10,15,20 tetra (4-pyridyl)-21H, 23H porphine chloride tetrakis (metachloride). The coated nanoparticles were deposited on quartz substrate using self-assembly through dip coating technique. The sensing properties of the thin film toward volatile organic compounds; ethanol, acetone, cyclohexane and 2-propanol were studied using luminescence spectrometer. It was found that the thin film produced different emission spectra peaks for different volatile organic compounds (VOCs). Hence, it eases  chemical identification process and potentially be use as fluorescence gas sensor.

Keywords: TiO₂ nanoparticles_; porphyrin dye; volatile organic compounds; self-assembly; fluorescence gas sensor.

ABSTRAK

Kajian ini mengkaji kebarangkalian menggunakan teknik pendaflour untuk mengesan kehadiran sebatian organik meruap menggunakan sejenis bahan penderia. Bahan yang digunakan adalah TiO₂ nanozarah bersalut porfirin. Larutan sol gel TiO₂ nanozarah disintesis dari titanium (IV) ethoxide dalam ethanol dengan tambahab kalium chlorida (KCl) sebagai  bahan pentabil. TiO₂ nanozarah kemudiannya disalut  dengan pencelup porfirin; manganase (III) 5,10,15,20 tetra (4-pyridyl)-21H, 23H porphine chlorida tetrakis (metachloride). Nanozarah yang telah disalut ini dimendapkan di atas substrat kuartza secara swa-melekat menggunakan teknik celupan. Teknik penderiaan filem nipis ini terhadap sebatian organik meruap; etanol, aseton, siklo hexana dan 2-propanol dikaji menggunakan spektrometer Luminesen. Hasilnya mendapati, filem nipis ini menghasilkan spektrum pancaran cahaya yang berlainan setiap kali didedahkan kepada sebatian organik meruap yang berlainan. Maka dengan ini, filem nipis ini dapat digunakan untuk proses pengecaman kimia dan berpotensi diguna sebagai penderia gas pendarflour.

Kata kunci: nanozarah TiO_2; porfirin; sebatian organic meruap; swa melekat; penderia gas pendarflour.

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