Humidity sensors based on aluminum phthalocyanine chloride thin films

Chani, Muhammad Tariq Saeed; Karimov, Khasan S.; Khalid, Fazal Ahmad; Raza, Kabeer; Farooq, Muhammad; Zafar, Qayyum

doi:10.1016/j.physe.2012.07.012

Cited by 42 publications

(19 citation statements)

References 21 publications

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“…Halometallo(III)phthalocyanines (XM(III)Pc) exemplified by the axially ligated halide derivatives of aluminum, gallium, chromium and indium are non-planar by virtue of the axial halide atom which protrudes above the macrocycle ring. For example, the evaporated films of ClAlPc have been studied as humidity-selective sensors [19]. The sensitivity of devices versus humidity, ammonia and ethanol has been investigated as function of analyte concentration and working temperature [20].…”

Section: Introductionmentioning

confidence: 99%

Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance

Evyapan

Kadem

Basova

et al. 2016

Sensors and Actuators B: Chemical

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This document is the author deposited version. You are advised to consult the publisher's version if you wish to cite from it. Published versionEVYAPAN, Murat, KADEM, Burak, BASOVA, Tamara V., YUSHINA, Irina V. and HASSAN, Aseel (2016). Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance. Sensors and Actuators B: Chemical, 236, 605-613. Copyright and re-use policySee http://shura.shu.ac.uk/information.html Sheffield Hallam University Research Archivehttp://shura.shu.ac.uk Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance AbstractIn this work, thin films of chloroaluminium phthalocyanine (ClAlPc), fluoroaluminium phthalocyanine (FAlPc) and fluorochromium phthalocyanine (FCrPc), which are insoluble in conventional solvents, were deposited by spin coating of their solutions in trifluoroacetic acid.The sensing response of these films versus acetic acid, three alcohols (methanol, ethanol, butanol) and three amines (methylamine, dimethylamine, trimethylamine) have been investigated using surface plasmon resonance as the sensing method. It has been shown that the sensor response of the investigated films decreases in the following order: acetic acid > alcohols > amines. The optical changes as monitored by SPR method have been used in conjunction with Fick's second law of diffusion to determine the diffusion coefficients of analyte vapor during the films' swelling process. The obtained results showed that the diffusion coefficients and the swelling characteristics of the films are dependent on the functional group of the phthalocyanine molecule and the molecular size of the analyte.

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Section: Introductionmentioning

confidence: 99%

Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance

Evyapan

Kadem

Basova

et al. 2016

Sensors and Actuators B: Chemical

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“…After annealing, the initial resistance of the sensors increases by 14% and 24%, and it may be attributed to the increase in the porosity of films as a result of annealing. [18] Figures 4(a) and 4(b) show the SEM image of AlPcCl films before and after annealing respectively. It is evident from the surface morphology that the porosity increases as a result of annealing.…”

Section: Resultsmentioning

confidence: 99%

“…[4,17] Recently, our group investigated AlPcCl films for humidity sensing applications and found it highly sensitive to humidity with short response and recovery time. [18] Thin film devices (surface type) were also fabricated for sensing application by Kato et al [19] They studied the effect of ethanol vapor treatment on the current versus voltage characteristics of AlPcCl films. The ethanol vapor treated AlPcCl films showed significant change in conduction current as compared to as fabricated films.…”

Section: Introductionmentioning

confidence: 99%

Aluminium phthalocyanine chloride thin films for temperature sensing

Chani¹,

Asiri²,

Karimov³

et al. 2013

Chinese Phys. B

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This study presents the fabrication and temperature sensing properties of sensors based on aluminium phthalocyanine chloride (AlPcCl) thin films. To fabricate the sensors, 50-nm-thick electrodes with 50-µm gaps between them are deposited on glass substrates. AlPcCl thin films with thickness of 50-100 nm are deposited in the gap between electrodes by thermal evaporation. The resistance of the sensors decreases with increasing thickness and the annealing at 100 • C results in an increase in the initial resistance of sensors up to 24%. The sensing mechanism is based on the change in resistance with temperature. For temperature varying from 25 • C to 80 • C, the change in resistance is up to 60%. Simulation is carried out and results obtained coincide with experimental data with an error of ±1%.

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“…The humidity control is also necessary in moisture-sensitive environments, such as in pharmaceutical industries, food storages, building air-conditioning, museums, paper industry and libraries. Resultantly, in view of their significant technological importance, there is rapid and continued advancement in fabrication of economical, miniaturized and sensitive humidity sensors [6,7].…”

Section: Introductionmentioning

confidence: 99%

Frequency Dependence of Electrical Parameters of an Organic-Inorganic Hybrid Composite Based Humidity Sensor

Akram

2016

Electronics

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Abstract:The present study highlights the interdependence of ambient humidity levels on the electrical parameters of organic-inorganic hybrid composite based humidity sensor at varied AC frequencies of input signal. Starting from the bottom, the layer stack of the fabricated humidity sensor was 200-nm silver (Ag) thin film and 4 µm spun-coated PEPC+NiPC+Cu 2 O active layer. Silver thin films were deposited by thermal evaporator on well cleaned microscopic glass slides, which served as a substrate. Conventional optical lithography procedure was adapted to define pairs of silver-silver surface electrodes with two sorts of configurations, i.e., interdigitated and rectangular. Humidity-sensitive layers of organic-inorganic composite were then spun-cast upon the channel between the silver electrodes. The changes in relative humidity levels induced variation in capacitance and impedance of the sensors. These variations in electrical parameters of sensors were also found to be highly dependent upon frequency of input AC signal. Our findings reveal that the organic-inorganic composite shows higher humidity sensitivity at smaller orders of frequency. This finding is in accordance with the established fact that organic semiconductors-based devices are not applicable for high frequency applications due to their lower charge carrier mobility values. Two distinct geometries of semiconducting medium between the silver electrodes were investigated to optimize the sensing parameters of the humidity sensor. Furthermore, the effect of temperature change on the resistance of organic composite has also been studied.

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Humidity sensors based on aluminum phthalocyanine chloride thin films

Cited by 42 publications

References 21 publications

Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance

Study of the sensor response of spun metal phthalocyanine films to volatile organic vapors using surface plasmon resonance

Aluminium phthalocyanine chloride thin films for temperature sensing

Frequency Dependence of Electrical Parameters of an Organic-Inorganic Hybrid Composite Based Humidity Sensor

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