Ammonia adsorption kinetics on substituted phthalocyanine thin film

Abstract

The sensing performance of 2(3),9(10),16(17),23(24)- tetrakis-[4-nitro-2-(octyloxy)phenoxy]phthalocyaninato zinc(II)  thin film towards ammonia and the influence of relative humidity on it were studied. The results show that the exposure to ammonia gas leads to an increase in sensor current, which is unexpected because of the strong electron donating character of ammonia and p-type semiconductivity of phthalocyanine. This unexpected behavior is related to the change in electronic band structure of the Pc molecule. It was observed that relative humidity enhances the ammonia adsorption. Several adsorption kinetics model were employed to represent the ammonia adsorption on the sensor surface. Analysis of the experimental data indicated that a simple adsorption model can be used to represent our adsorption system.

 

Keywords

• amonia sensor,adsorption kinetics,response time

Substitute ftalosiyanin yüzeyinde amonyak adsorpsiyon kinetiği

Abstract

2(3),9(10),16(17),23(24)- tetrakis-[4-nitro-2-(octyloxy)phenoxy]phthalocyaninato zinc(II) ince filmin amonyak algılama performansı ve nisbi nemin amonyak algılama özellikleri üzerindeki etkisi incelenmiştir. Sonuçlar filmin amonyak gazına maruz bırakılması durumunda, amonyak’ın kuvvetli bir elektron verici ve ftalosiyanin bileşiklerinin de p-tip yarıiletken özellik göstermelerine rağmen, beklenmedik bir şekilde iletkenliğinin arttığını göstermiştir. Ortamdaki nisbi nem oranının amonyak adsorpsiyonunu iyileştirdiği gözlemlenmiştir. Sensör yüzeyindeki amonyak adsorpsiyonunu temsil etmek üzere birkaç farklı kinetik model test edilmiş ve, adsorpsiyon sistemini temsil etmek üzere basit bir adsorpsiyon modelinin kullanılabileceği görülmüştür.  

Keywords

• amonyak sensörü,adsorpsiyon kinetiği,cevap süresi

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