Ammonia adsorption kinetics on substituted phthalocyanine thin film

Year 2017, , 1153 - 1159, 01.12.2017

Çiğdem Oruç Ahmet Altındal

https://doi.org/10.16984/saufenbilder.270709

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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