Room Temperature BTX Sensor Based on Zinc Phthalocyanine Thin Film

Year 2019, Volume: 45 Issue: 2, 136 - 148, 30.10.2019

Asuman Aşıkoğlu Bozkurt

https://doi.org/10.35238/sufefd.582395

Abstract

This study deals with comparing
interaction mechanisms of 2(3), 9(10), 16(17),
23(24)-Tetra-((5-bromo-2-methoxyphenyl)diazenyl) phthalocyaninatozinc(II) (zinc phthalocyanine) thin film with
versatile chemical vapours: stable and electron donating aromatic vapours
namely; benzene, toluene and xylene. The variation in electrical conductivity
of zinc phthalocyanine is used
as an indicator of the BTX- zinc
phthalocyanine interactions. It was found that, unexpectedly, the exposure
of the sensor surface to BTX vapors cause an increase in sensor current. It was
observed for low concentrations of BTX vapours that, zinc phthalocyanine based sensor exhibits maximum and minimum
sensitivities towards toluene and xylene vapors, respectively. However, the
maximum and minimum sensitivities of the sensor gradually changes from xylene
to benzene for high concentrations of BTX vapors. These findings was concluded
in the framework of reaction activation energy and the presence of some water dissociated
species, such as H⁺ or OH⁻.

Keywords

BTX sensing, phthalocyanine, response time, relative humidity

Supporting Institution

Yıldız Technical University Research Projects Coordination

Project Number

2015-01-01-GEP01

Oda Sıcaklığında Çinko Ftalosiyaninin BTX Gazlarına Duyarlılığı

Abstract

Bu çalışmada; benzen, toluen ve ksilen gibi elektron veren stabil aromatik
buharların 2(3), 9(10), 16(17), 23(24)-Tetra-((5-bromo-2-methoxyphenyl)diazenyl)
phthalocyaninatozinc(II) (Çinko ftalosiyanine) ince film mekanizması ile
etkileşimi karşılaştırılmıştır. Çinko ftalosiyanine’in elektriksel
iletkenlikteki değişimi, BTX- çinko ftalosiyanine
etkileşiminin bir göstergesi olarak kullanılır. Sensör yüzeyinin BTX
buharlarına maruz kalması, sensör akımında beklenmedik bir artışa neden
olmaktadır. Düşük BTX buhar konsantrasyonlarında, çinko ftalosiyanine sensörü toluen buharlarına maksimum, ksilen
buharına minimum hassasiyet göstermektedir. Ancak, yüksek BTX buhar
konsantrsanyonlarında ksilen için maksimum, benzene için minimum duyarlılık
görülmüştür. Bu bulgular, H⁺ ve OH⁻ gibi bazı ayrışmış su
moleküllerinin varlığı ve reaksiyon aktivasyon enerjisinin sonucudur.

Keywords

BTX algılama, ftalosiyanine, cevap süresi, bağıl nem

Project Number

2015-01-01-GEP01

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