Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

2018 ◽  
Vol 22 (01n03) ◽  
pp. 121-136 ◽  
Author(s):  
Baybars Köksoy ◽  
Meryem Aygün ◽  
Aylin Çapkin ◽  
Fatih Dumludağ ◽  
Mustafa Bulut
Keyword(s):  
Butyl Acetate ◽  
Gas Sensing ◽  
Response Times ◽  
Sensing Properties ◽  
Mass Spectral ◽  
H Nmr ◽  
Gas Sensing Properties ◽  
Volatile Organic ◽  
Ft Ir ◽  
Increasing Temperature

The synthesis of metallophthalocyanines (M [Formula: see text] Co, Cu, Mn) bearing four ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties was performed. These novel compounds were characterized by elemental analysis, [Formula: see text]H-NMR spectroscopy, FT-IR, UV-vis and mass spectral data. DC and AC electrical properties of the films of metallophthalocyanines were investigated in the temperature range of 295–523 K. AC measurements were performed in the frequency range of 40–10[Formula: see text] Hz. Activation energy values of the films took place between 0.55 eV–0.93 eV. Impedance spectroscopy measurements revealed that bulk resistance decreases with increasing temperature, indicating semiconductor properties. DC conductivity results also supported this result. Their gas sensing properties were also investigated for the vapors of Volatile Organic Compounds (VOCs), [Formula: see text]-butyl acetate (200–3200 ppm) and ammonia (7000–56000 ppm) between temperatures 25–100°C. Sensitivity and response times of the films for the tested vapors were reported. The results were found to be reversible and sensitive to the vapors of [Formula: see text]-butyl acetate and ammonia. It was found that Mn(OAc)Pc showed better sensitivity than CoPc and CuPc for [Formula: see text]-butyl acetate vapors at all measured vapor concentrations and temperatures. Mn(OAc)Pc also showed better sensitivity than CoPc and CuPc for ammonia vapors at 22°C.

Synthesis and QCM gas-sensing properties of 3,4-dialkoxyphenyl tosylamino-substituted phthalocyanines

2020 ◽  
Vol 24 (05n07) ◽  
pp. 830-839 ◽  
Author(s):  
Mika Harbeck ◽  
Zafer Şen ◽  
Dilek D. Erbahar ◽  
Esranur Fidan Çelik ◽  
Gülay Gümüş ◽  
...  
Keyword(s):  
Metal Ion ◽  
Gas Sensing ◽  
Metal Salt ◽  
Chemical Warfare Agent ◽  
Sensing Properties ◽  
Alkyl Chains ◽  
H Nmr ◽  
Gas Sensing Properties ◽  
Ft Ir ◽  
New Compounds

Octa-substituted metallophthalocyanines [M = Ni(II), Zn(II), Co(II), and Cu(II)] carrying 3,4-dialkoxyphenyl tosylamino groups at the peripheral positions have been synthesized from 1,2-dicyano-4,5-bis[(3,4-dialkoxyphenyl-tosylamino)methyl]benzene in the presence of the corresponding anhydrous metal salt. Next to the metal ion center, the length of the alkyl chains in the dialkoxyphenyl moiety ([Formula: see text], 5, 6, and 12) was varied. In total, sixteen soluble phthalocyanines have been characterized by elemental analysis, FT-IR and [Formula: see text]H-NMR spectroscopy as well as mass spectrometry. Furthermore, the gas sensing properties of these new compounds have been studied using quartz crystal microbalance transducers. The sensing properties are described on the basis of sensor responses to nine different test analytes comprising volatile organic compounds, toxic gases, and chemical warfare agent simulants. The influence of the metal ion center and substituents on sensor selectivity and sensitivity is discussed. The compounds show good performance in the gas-sensing experiments with diverse responses to the analytes. Phthalocyanine species with pronounced selectivity for polar analytes, hydrocarbons or amines have been identified among the set of sensors with the help of multivariate data exploration methods. The results reveal that quite a high diversity in terms of selectivity is introduced through the minute variations to the phthalocyanine structure.

Synthesis and VOC gas sensing properties of Polypyrrole / MoO3 Nanohybrids

2003 ◽  
Vol 785 ◽  
Author(s):  
Kouta Hosono ◽  
Ichiro Matsubara ◽  
Norimitsu Murayama ◽  
Shin Woosuck ◽  
Noriya Izu
Keyword(s):  
Thin Films ◽  
Organic Compound ◽  
Volatile Organic Compound ◽  
Crystallographic Orientation ◽  
Electrical Resistance ◽  
Gas Sensing ◽  
Sodium Ions ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

ABSTRACTWe have prepared polypyrrole (PPy) / MoO3 nanohybrid thin films and evaluated their volatile organic compound (VOC) gas sensing properties. The (PPy)xMoO3 thin films have been prepared by intercalation reactions of highly oriented MoO3 thin films. Intercalation of hydrated sodium ions successfully proceeded without loosing the crystallographic orientation. The (PPy)xMoO3 thin films was obtained by replacing the hydrated sodium ions with PPy. The (PPy)xMoO3 thin films can detect formaldehyde gas by increasing in their electrical resistance, whereas they showed no response to toluene.

FILMS SPIN-COATED WITH GALLIC ACID AND THE DETECTION OF SPUN FILMS AGAINST VOLATILE ORGANIC COMPOUNDS

2019 ◽  
Vol 27 (02) ◽  
pp. 1950106
Author(s):  
SİBEL ŞEN
Keyword(s):  
Thin Films ◽  
Volatile Organic Compounds ◽  
Gallic Acid ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Quartz Substrate ◽  
Methanol Vapor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

To determine thin films’ properties of commercially available gallic acid molecule, they were deposited onto a suitable substrate using spin coater. UV–Visible absorption spectroscopy and atomic force microscopy (AFM) were employed for the characterization of the deposited thin films. Characterization results obtained by these two techniques indicated that the gallic acid molecules are suitable for transfer onto a glass or quartz substrate. Gas-sensing properties and thickness of these thin films were elucidated using surface plasmon resonance (SPR). Thickness values of spun thin films were obtained at different spinning speeds. Then, the gas-sensing properties were examined by exposing them to the vapors of four volatile organic compounds (VOCs). It was found that the spun films of this material were selective for methanol vapor yielding rapid response and recovery time and thin films of gallic acid exhibited reversible changes in the optical behavior, which makes them suitable for practical methanol-detection applications.

Hydrothermally synthesized CuO based volatile organic compound gas sensor

RSC Advances ◽  
2014 ◽  
Vol 4 (101) ◽  
pp. 57975-57982 ◽  
Author(s):  
Shufeng Xia ◽  
Huichao Zhu ◽  
Haitao Cai ◽  
Jiaqi Zhang ◽  
Jun Yu ◽  
...  
Keyword(s):  
Organic Compound ◽  
Hydrothermal Method ◽  
Gas Sensor ◽  
Volatile Organic Compound ◽  
Single Phase ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

In the present work, single-phase CuO particles were synthesized by a hydrothermal method and characterized by SEM, TEM and XRD. The gas sensing properties of the CuO based sensor to some representative flammable VOC gases were investigated.

scholarly journals Effect of Ag Addition on the Gas-Sensing Properties of Nanostructured Resistive-Based Gas Sensors: An Overview

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6454
Author(s):  
Sachin Navale ◽  
Mehrdad Shahbaz ◽  
Ali Mirzaei ◽  
Sang Sub Kim ◽  
Hyoun Woo Kim
Keyword(s):  
Gas Sensors ◽  
Noble Metals ◽  
Gas Sensing ◽  
Response Times ◽  
Detection Mechanism ◽  
Ag Addition ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Semiconducting Metal Oxides ◽  
The Impact

Nanostructured semiconducting metal oxides (SMOs) are among the most popular sensing materials for integration into resistive-type gas sensors owing to their low costs and high sensing performances. SMOs can be decorated or doped with noble metals to further enhance their gas sensing properties. Ag is one of the cheapest noble metals, and it is extensively used in the decoration or doping of SMOs to boost the overall gas-sensing performances of SMOs. In this review, we discussed the impact of Ag addition on the gas-sensing properties of nanostructured resistive-based gas sensors. Ag-decorated or -doped SMOs often exhibit better responsivities/selectivities at low sensing temperatures and shorter response times than those of their pristine counterparts. Herein, the focus was on the detection mechanism of SMO-based gas sensors in the presence of Ag. This review can provide insights for research on SMO-based gas sensors.

scholarly journals Enhancement of Hydrothermally Co3O4 Thin Films as H2S Gas Sensor by Loading Yttrium Element

2019 ◽  
Vol 16 (1) ◽  
pp. 0221
Author(s):  
Hamdan Et al.
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Response Times ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Sensing Properties ◽  
Nano Structures ◽  
Reducing Gas ◽  
Gas Sensing Properties ◽  
H2s Gas Sensor

The gas sensing properties of Co3O4 and Co3O4:Y nano structures were investigated. The films were synthesized using the hydrothermal method on a seeded layer. The XRD, SEM analysis and gas sensing properties were investigated for Co3O4 and Co3O4:Y thin films. XRD analysis shows that all films are polycrystalline in nature, having a cubic structure, and the crystallite size is (11.7)nm for cobalt oxide and (9.3)nm for the Co3O4:10%Y. The SEM analysis of thin films obviously indicates that Co3O4 possesses a nanosphere-like structure and a flower-like structure for Co3O4:Y. The sensitivity, response time and recovery time to a H2S reducing gas were tested at different operating temperatures. The resistance changes with exposure to the test gas. The results reveal that the Co3O4:10%Y possesses the highest sensitivity around 80% at a 100oC operating temperature when exposed to the reducing gas H2S with 0.8sec for both recovery and response times.

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