Effect of chemical environments on palladium phthalocyanine thin film sensors for humidity analysis

Jafari, Mohammad Javad; Azim-Araghi, M.E.; Barhemat, Samira

doi:10.1007/s10853-011-5996-4

Cited by 22 publications

(17 citation statements)

References 36 publications

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“…The details show that the thin film devices have good response and reversibility and can be used as gas on/off switches. In comparison with results of NO 2 and NH 3 , PdPc has shown much quicker response on exposure to humidity (~ 40 s) and oxygen (~ 100 s) . The response and recovery time of devices are directly dependent on environmental conditions such as surface pressure, sensing temperature, and type of reactions between analyte and Pcs molecules sensing, which can influence sensing mechanism.…”

Section: Resultsmentioning

confidence: 92%

“…By contrast to other MPcs (especially CuPc and ZnPc), few studies have been carried out on PdPc as an active material to fabricate gas sensors. Our previous studies have shown that PdPc has very good sensitivity and reversibility versus relative humidity in different chemical environments and can be used as oxygen gas sensor with short response time.…”

Section: Introductionmentioning

confidence: 99%

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Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

Jafari¹,

Azim-Araghi²,

Barhemat³

et al. 2012

Surface & Interface Analysis

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aThe effect of post-deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine (PdPc) nanostructured thin films has been studied. PdPc thin films were deposited on polyborosilicate substrate by thermal evaporation technique at room temperature. The surface morphology of thin films was investigated by SEM, X-ray diffraction, and optical absorption. X-ray diffraction patterns showed a phase transition from a to b based on post-deposition annealing at temperatures above 200 C. The SEM and optical absorption confirmed that annealing strongly influenced the surface morphology of nanostructured thin films. Sandwich devices (Au|PdPc|Al) were fabricated and exposed to different concentrations of NO 2 and NH 3 as oxidizing and reducing gases at different temperatures, and the sensitivity of devices were obtained versus gases. Obtained results showed a-PdPc thin film devices had higher sensitivity in comparison with devices in b-phase. In particular, it was found that the sensitivity of devices is temperature dependent and the best operating temperature range of devices was measured at about 90-100 C. Devices showed good reversibility, response, and recovery time at room temperature. Finally, the stability of sensors was investigated for a period of about 1 year; results showed that the sensors were stable for 2 months and lost about 30% of their sensitivity after 1 year.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

Jafari¹,

Azim-Araghi²,

Barhemat³

et al. 2012

Surface & Interface Analysis

Self Cite

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“…Besides, thin films of palladium phthalocyanine have good sensing properties for different gaseous analytes, with fast response times, high base line stability and enhanced sensitivity. It has recently been shown that PdPc films demonstrate high sensitivity when used as chemical sensors for the detection of oxygen, ammonia, NO 2 and humidity [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

et al. 2018

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In this work, the crystalline structure of single crystals grown by vacuum sublimation of unsubstituted palladium phthalocyanines (PdPc), its tetrafluorinated (PdPcF 4) and hexadecafluorinated (PdPcF 16) derivatives have been investigated using X-ray diffraction measurements. Two crystalline phases have been identified for PdPc; the molecules in both phases crystallize in stacks with herringbone arrangement in the monoclinic space groups (C2/c for -PdPc; P2 1 /n for -PdPc). Both PdPcF 4 and PdPcF 16 crystallize in the triclinic P-1 space group, forming stacks of molecules in columnar arrangement with molecules in adjacent columns are aligned parallel to one another. X-ray diffraction measurements have also been used to elucidate the structural features and molecular orientation of thin films of PdPc, PdPcF 4 and PdPcF 16 , grown by organic molecular beam deposition at different substrate temperatures. The effect of fluorosubstitution on UV-visible optical absorption and vibrational spectra of palladium phthalocyanine derivatives is also discussed.

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“…The sensitivity of this RFID sensor to water vapor was expected to be temperature-dependent as was demonstrated earlier with numerous sensing materials [1, 6, 45-48]. The effects of temperature on the water-vapor sensitivity of the sensor are illustrated in Fig.…”

Section: Resultsmentioning

confidence: 69%

A passive radio-frequency identification (RFID) gas sensor with self-correction against fluctuations of ambient temperature

Potyrailo

Surman

2013

Sensors and Actuators B: Chemical

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Uncontrolled fluctuations of ambient temperature in the field typically greatly reduce accuracy of gas sensors. In this study, we developed an approach for the self-correction against fluctuations of ambient temperature of individual gas and vapor sensors. The main innovation of our work is in the temperature correction which is accomplished without the need for a separate uncoated reference sensor or a separate temperature sensor. Our sensors are resonant inductor-capacitor-resistor (LCR) transducers coated with sensing materials and operated as multivariable passive (battery-free) radio-frequency identification (RFID) sensors. Using our developed approach, we performed quantitation of an exemplary vapor over the temperature range from 25 to 40 °C. This technical solution will be attractive in numerous applications where temperature stabilization of a gas sensor or addition of auxiliary temperature or uncoated reference sensors is prohibitive.

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Effect of chemical environments on palladium phthalocyanine thin film sensors for humidity analysis

Cited by 22 publications

References 36 publications

Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

Effect of post‐deposition annealing on surface morphology and gas sensing properties of palladium phthalocyanine thin films

Effect of fluorosubstitution on the structure of single crystals, thin films and spectral properties of palladium phthalocyanines

A passive radio-frequency identification (RFID) gas sensor with self-correction against fluctuations of ambient temperature

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