Humidity and illumination organic semiconductor copper phthalocyanine sensor for environmental monitoring

Karimov, Khasan S.; Qazi, Ibrahim; Khan, Tayyab; Draper, P. H.; Khalid, Fazal Ahmad; Mahroof-Tahir, Mohammad

doi:10.1007/s10661-007-9898-5

Cited by 65 publications

(27 citation statements)

References 12 publications

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“…Relative humidity (RH) sensor is mainly used for monitoring atmospheric humidity environment and shows important applications in warehousing [1], environmental monitoring [2], instruments and meters, and meteorology [3]. Until now, various types of humidity sensors have been reported, such as resistance type [4], capacitor type [5], field-effect-transistor type [6], optical type [7, 8], and so on.…”

Section: Introductionmentioning

confidence: 99%

Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous Membranes

You

Zhang

et al. 2017

Nanoscale Res Lett

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Humidity indicators based on composite polyamide 66/cobalt chloride (PA66/CoCl2) nanofibrous membranes (NFMs) were successfully fabricated by electrospinning. A series of NFMs with various weight percentage of CoCl2 to PA66 were prepared, and their humidity sensitivity based on color changing and quartz crystal microbalance (QCM) were studied. Due to the color change property of cobalt chloride, the as-spun composite NFMs show obviously macroscopic color change from blue to pink as relative humidity (RH) increasing from 12.4 to 97.2%. Moreover, the QCM detection showed a linear dependence on the RH changing and exhibited short response/recovery time (less than 65.4 s/11 s), small hysteresis (less than 11%), good reproducibility, and stability. Owing to the above double sensitive mechanism on RH, the PA66/CoCl2 composite NFM may show great potential applications from meticulous to coarse.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2139-0) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous Membranes

You

Zhang

et al. 2017

Nanoscale Res Lett

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“…These two situations can be illustrated as a charging capacitor in which the area under the curve corresponds to the stored charge. Indeed, Karimov et al observed capacitive changes on non-substituted CuPc-covered electrodes and exploited such effect in sensing devices [52]. From Fig.…”

Section: Resultsmentioning

confidence: 96%

“…Otherwise MPcs are insulating in high vacuum and dark environments [46,51]. Regarding humidity effects, Bohrer et al observed electrical current changes on cobalt and metal-free phthalocyaninebased chemiresistors due to the device exposure to water vapor, whereas Karimov and co-workers registered capacitance changes on copper phthalocyanine-coated electrodes for different RH values [51,52]. According to Bohrer et al vapor molecules in general interact at phthalocyanine free sites but can also compete for O 2 -bound sites [51,[53][54][55] and Karimov et al expect that water molecules can act as p-type dopants in MPcs similar to the O 2 effect [52].…”

Section: Resultsmentioning

confidence: 99%

“…Regarding humidity effects, Bohrer et al observed electrical current changes on cobalt and metal-free phthalocyaninebased chemiresistors due to the device exposure to water vapor, whereas Karimov and co-workers registered capacitance changes on copper phthalocyanine-coated electrodes for different RH values [51,52]. According to Bohrer et al vapor molecules in general interact at phthalocyanine free sites but can also compete for O 2 -bound sites [51,[53][54][55] and Karimov et al expect that water molecules can act as p-type dopants in MPcs similar to the O 2 effect [52]. Harbeck et al, using quartz crystal microbalance sensors and Fourier transform infrared (FTIR) spectroscopy, observed that water sorption in fact occurs at the core of substituted MPcs as well as weak hydrogen bonds in N-H groups of metal-free phthalocyanines [54].…”

Section: Resultsmentioning

confidence: 99%

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Effects of humidity on the electrical properties of thermal inkjet-printed films of copper tetrasulfonated phthalocyanine (CuTsPc) onto paper substrates

et al. 2014

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The effects of humidity on the electrical properties of thermal inkjet-printed copper tetrasulfonated phthalocyanine (CuTsPc) films onto paper substrates are reported. DC electrical measurements revealed that sample resistance decreases from 10 12 X in moderate vacuum to approximately 10 7 X at highly water-saturated atmosphere. This behavior is attributed to the creation of water pathways on the cellulose fibers that allow ionic species such as impurities, protons (H ? ), and dissociated Na ? ions from the CuTsPc molecules, to flow. The contribution of the CuTsPc molecules and their dissociated Na ? ions on the sample resistance was elucidated analyzing the electrical response of bare and printed paper substrates. An increase of relative humidity levels (RH) from 10 % to 40-45 % revealed an increase of current of four orders of magnitude for printed samples, whereas less than one order of magnitude was registered for bare paper substrates. Electrical measurements as a function of temperature have shown that moisture can inhibit the semiconducting properties of CuTsPc. Thermal gravimetric studies revealed that approximately 11 % of mass accounting to the presence of water is released above 70°C, the same temperature in which the sample recovers its dry-state semiconducting behavior. The semiconducting properties of CuTsPc can also be observed upon white light illumination, whereas the charge carrier extraction is governed by the RH level. These results point out the important role of humidity on the electrical properties of paper-based organic, electronic, and optoelectronic devices.

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“…In this study, we have used NiPc in illumination sensors, extending our previous work using CuPc [9]. One of the major advantages of NiPc over CuPc is that its charge carriers possess higher mobility (0.1 and 10 −4 cm 2 /V s for electrons and holes, respectively) [10].…”

Section: Introductionmentioning

confidence: 82%

Nickel Phthalocyanine-Based Sandwich-Type Photocapacitive Illumination Sensors for Environmental Monitoring

Murtaza

Karimov

2011

Arab J Sci Eng

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In this paper, the properties of organic semiconductor nickel phthalocyanine (NiPc)-based photocapacitive illumination sensors are reported. Thin films of NiPc and aluminum were deposited sequentially by vacuum evaporation on ITO-coated glass substrates to form ITO/NiPc/Al sensors with different thicknesses of NiPc, i.e., 50, 100 and 150 nm. The effective surface area of each cell was 80 mm 2 (8 × 10 mm). The cells were then annealed at 150 • C for 2 h under ambient conditions to improve the uniformity of the films. The effects of film thickness and illumination with a filament lamp on the capacitance of the sensors were studied. Under filament lamp illumination of up to 2,000 lx the relative photocapacitance of the sensors increased by 50%. It was assumed that the photocapacitive response of the sensors is associated with polarization caused by the transfer of photogenerated electrons and holes. The illumination-dependent capacitance properties of these sensors make them attractive for use in multimeters and instruments for environmental monitoring of illumination.

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Humidity and illumination organic semiconductor copper phthalocyanine sensor for environmental monitoring

Cited by 65 publications

References 12 publications

Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous Membranes

Colorimetric Humidity Sensors Based on Electrospun Polyamide/CoCl2 Nanofibrous Membranes

Effects of humidity on the electrical properties of thermal inkjet-printed films of copper tetrasulfonated phthalocyanine (CuTsPc) onto paper substrates

Nickel Phthalocyanine-Based Sandwich-Type Photocapacitive Illumination Sensors for Environmental Monitoring

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