scholarly journals Quartz Crystal Microbalance Based Sensor Arrays for Detection and Discrimination of VOCs Using Phosphonium Ionic Liquid Composites

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 615
Author(s):  
Stephanie R. Vaughan ◽  
Rocío L. Pérez ◽  
Pratap Chhotaray ◽  
Isiah M. Warner
Keyword(s):  
Polymer Composites ◽  
Quartz Crystal ◽  
Sensor Arrays ◽  
Coating Materials ◽  
Chlorinated Volatile Organic Compounds ◽  
Vapor Sensing ◽  
Phosphonium Ionic Liquid ◽  
Volatile Organic ◽  
Increase In Accuracy ◽  
Insight Into

Herein, we examine two sensing schemes for detection and discrimination of chlorinated volatile organic compounds (VOCs). In this work, phosphonium ionic liquids (ILs) were synthesized and vapor sensing properties examined and compared to phosphonium IL-polymer composites. Pure IL sensors were used to develop a QCM-based multisensory array (MSA), while IL-polymer composites were used to develop an MSA and virtual sensor arrays (VSAs). It was found that by employing the composite MSA, five chlorinated VOCs were accurately discriminated at 95.56%, which was an increase in accuracy as compared to pure ILs MSA (84.45%). Data acquired with two out of three VSAs allowed discrimination of chlorinated VOCs with 100% accuracy. These studies have provided greater insight into the benefits of incorporating polymers in coating materials for enhanced discrimination accuracies of QCM-based sensor arrays. To the best of our knowledge, this is the first report of a QCM-based VSA for discrimination of closely related chlorinated VOCs.

Liquid crystal porphyrins as chemically sensitive coating materials for chemical sensors

2009 ◽  
Vol 13 (11) ◽  
pp. 1188-1195 ◽  
Author(s):  
Ali Şems Ahsen ◽  
Antoni Segade ◽  
Dolores Velasco ◽  
Zafer Ziya Öztürk
Keyword(s):  
Liquid Crystal ◽  
Partition Coefficients ◽  
Quartz Crystal ◽  
Coating Materials ◽  
Alkyl Chains ◽  
Coated Film ◽  
Volatile Organic ◽  
History Of ◽  
Quartz Crystal Microbalances ◽  
Sensitive Coating

Columnar liquid crystal porphyrin compounds have been deposited onto the gold pads of quartz crystal microbalances (QMBs). The sensitivities of the resulting sensors have been measured with respect to volatile organic compounds (VOCs) and have been found to be of interest for future applications. The results show a strong influence of the length of the side alkyl chains, furthermore the thermal history of the coated film also affects the measured properties. The partition coefficients of the coatings have been calculated from the sensor responses.

scholarly journals Coating-Based Quartz Crystal Microbalance Detection Methods of Environmentally Relevant Volatile Organic Compounds

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 153
Author(s):  
Rocío L. Pérez ◽  
Caitlan E. Ayala ◽  
Jong-Yoon Park ◽  
Jin-Woo Choi ◽  
Isiah M. Warner
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Sensor Arrays ◽  
Detection Methods ◽  
Electronic Systems ◽  
Atmospheric Conditions ◽  
Volatile Organic ◽  
Quartz Crystal Resonators

Volatile organic compounds (VOCs) that evaporate under standard atmospheric conditions are of growing concern. This is because it is well established that VOCs represent major contamination risks since release of these compounds into the atmosphere can contribute to global warming, and thus, can also be detrimental to the overall health of worldwide populations including plants, animals, and humans. Consequently, the detection, discrimination, and quantification of VOCs have become highly relevant areas of research over the past few decades. One method that has been and continues to be creatively developed for analyses of VOCs is the Quartz Crystal Microbalance (QCM). In this review, we summarize and analyze applications of QCM devices for the development of sensor arrays aimed at the detection of environmentally relevant VOCs. Herein, we also summarize applications of a variety of coatings, e.g., polymers, macrocycles, and ionic liquids that have been used and reported in the literature for surface modification in order to enhance sensing and selective detection of VOCs using quartz crystal resonators (QCRs) and thus QCM. In this review, we also summarize novel electronic systems that have been developed for improved QCM measurements.

scholarly journals Non-Thermal Plasma-Modified Ru-Sn-Ti Catalyst for Chlorinated Volatile Organic Compound Degradation

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1456
Author(s):  
Yujie Fu ◽  
You Zhang ◽  
Qi Xin ◽  
Zhong Zheng ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
Surface Oxidation ◽  
Treatment Method ◽  
X Ray ◽  
Chlorinated Volatile Organic Compounds ◽  
Volatile Organic ◽  
Doped Titania

Chlorinated volatile organic compounds (CVOCs) are vital environmental concerns due to their low biodegradability and long-term persistence. Catalytic combustion technology is one of the more commonly used technologies for the treatment of CVOCs. Catalysts with high low-temperature activity, superior selectivity of non-toxic products, and resistance to chlorine poisoning are desirable. Here we adopted a plasma treatment method to synthesize a tin-doped titania loaded with ruthenium dioxide (RuO2) catalyst, possessing enhanced activity (T90%, the temperature at which 90% of dichloromethane (DCM) is decomposed, is 262 °C) compared to the catalyst prepared by the conventional calcination method. As revealed by transmission electron microscopy, X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and hydrogen temperature-programmed reduction, the high surface area of the tin-doped titania catalyst and the enhanced dispersion and surface oxidation of RuO2 induced by plasma treatment were found to be the main factors determining excellent catalytic activities.

scholarly journals Chlorine-Resistant Hollow Nanosphere-Like VOx/CeO2 Catalysts for Highly Selective and Stable Destruction of 1,2-Dichloroethane: Byproduct Inhibition and Reaction Mechanism

Processes ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 119
Author(s):  
Yu Huang ◽  
Shiyue Fang ◽  
Mingjiao Tian ◽  
Zeyu Jiang ◽  
Yani Wu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Acid Sites ◽  
Strong Interactions ◽  
Hollow Nanosphere ◽  
Efficient Removal ◽  
Chlorinated Volatile Organic Compounds ◽  
Molar Ratios ◽  
Volatile Organic ◽  
Redox Ability ◽  
Species Mobility

Developing economical and robust catalysts for the highly selective and stable destruction of chlorinated volatile organic compounds (CVOCs) is a great challenge. Here, hollow nanosphere-like VOx/CeO2 catalysts with different V/Ce molar ratios were fabricated and adopted for the destruction of1,2–dichloroethane (1,2–DCE). The V0.05Ce catalyst possessed superior catalytic activity, reaction selectivity, and chlorine resistance owing to a large number of oxygen vacancies, excellent low-temperature redox ability, and chemically adsorbed oxygen (O− and O2−) species mobility. Typical chlorinated byproducts (CHCl3, CCl4, C2HCl3, and C2H3Cl3) derived from the cleavage of C–Cl and C–C bonds of 1,2–DCE were detected, which could be effectively inhibited by the abundant acid sites and the strong interactions of VOx species with CeO2. The presence of water vapor benefited the activation and deep destruction of 1,2–DCE over V0.05Ce owing to the efficient removal of Cl species from the catalyst surface.

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