Volatile organic compound sensing using copper oxide thin films: Addressing the cross sensitivity issue

Ghosh, Abhishek; Maity, Arnab; Banerjee, Rupak; Majumder, Snehamoy

doi:10.1016/j.jallcom.2016.09.001

Cited by 62 publications

(43 citation statements)

References 48 publications

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“…Note that the responses to other alcohol vapors such as methanol and propanol also display negative‐going response profiles. These response profiles exhibit a remarkable contrast to most of the traditional chemiresistors assembled by polymers or nanoparticles with molecular linkers (alkyl dithiols and alkyl dicarboxylic acid) on flexible or rigid substrates (PET and glass), which exhibited often positively going response characteristics in terms of Δ R / R i , but less often negative‐going responses depending on the interparticle dielectric medium properties . In the assembly of the dendronized Au NPs, the persistence of the negative‐going response profiles observed in this work is indicative of a significant impact of an increase of the interparticle dielectric medium constant as a result of the highly branched dendrons with both hydrophilic and hydrophobic structures in the 3D matrix on the electrical conductivity.…”

Section: Resultsmentioning

confidence: 59%

“…For breath or sweat sensors for human performance monitoring, the ability to monitor the moisture‐dominated breathing and sweating processes is critical for the sensor differentiation of other chemical or biological species from the moisture‐dominated environment. Technically, chemiresistors present the easily adapted format for wearable sensor devices, which are characterized most often by positive‐going responses (increases in resistance upon molecular adsorption into the sensing film), and less often by negative‐going responses, to the targeted chemical species, as demonstrated in our previous works and others . In order to differentiate different volatile organic compounds (VOCs) in moisture‐dominant environments such as breath and sweat, highly tunable response profiles are desired for the sensor elements in a sensor array.…”

Section: Introductionmentioning

confidence: 99%

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Decoration of Nanofibrous Paper Chemiresistors with Dendronized Nanoparticles toward Structurally Tunable Negative‐Going Response Characteristics to Human Breathing and Sweating

Yan

Liu

Skeete

et al. 2017

Adv Materials Inter

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The development of wearable breath or sweat sensor arrays for human performance monitoring is increasingly important for providing personalized health information under various environmental conditions. A major challenge is the lack of sensing elements responsive uniquely to moisture‐dominated breathing and sweating processes, which is critical for differentiating other chemical or biological species from the moisture‐dominated environment. Here a novel class of nanofibrous paper chemiresistors decorated with dendronized nanoparticles that exhibit structurally tunable and negative‐going responses to human breathing and sweating is reported. The nanocomposite device features flexible membrane‐type scaffold derived from multilayered nanofibrous paper as a biocompatible matrix and dendronized gold nanoparticles with tunable sizes and shapes to enable structural diversity and molecular sensitivity. Key elements of novelty include the immobilization of poly(ether‐ester) dendrons with oligoethylene glycol spacers on gold nanoparticles and the combination of hydrogen bonding and van der Waals interactions between partially interpenetrating dendrons, leading to tunable and unique response characteristics to breathing and sweating processes. The results demonstrate the first example of nanofibrous paper chemiresistors decorated with dendronized nanoparticles as a promising new strategy toward constructing sensing interfaces for wearable breath and sweat sensors.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Decoration of Nanofibrous Paper Chemiresistors with Dendronized Nanoparticles toward Structurally Tunable Negative‐Going Response Characteristics to Human Breathing and Sweating

Yan

Liu

Skeete

et al. 2017

Adv Materials Inter

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“…The resistance at which the sensor stabilizes in the presence of gas is termed R g . The response of the sensor to the test gas in measured in terms of response percent which is defined as [19,20].…”

Section: Methodsmentioning

confidence: 99%

“…However, recent research activities show that ptype semiconducting metal oxides such as copper oxide have been gaining popularity in gas sensing mainly due to its ease of fabrication, low cost, high stability, and high response to volatile organic compounds. CuO architectures such as nanorods [70], nanosheets [71], nanoparticles [72], and thin film [19] play an important role in gas sensing behavior. Thin films, in particular, are preferred over powdered CuO variants due to high stability and ease of device fabrication ( Table 8).…”

Section: Voc Sensing Characteristics Of Thin and Thick Filmmentioning

confidence: 99%

“…The static gas sensing setup is similar to a real environment response which explains the delayed recovery times. The response times mentioned are not exact as in a static gas sensing setup, where response to the test gas does not saturate before recovery begins [19]. Mixed gas sensing was also performed with ethanol and acetone (300 ppm/300 ppm) at 300°C.…”

Section: Voc Sensing Characteristics Of Thin and Thick Filmmentioning

confidence: 99%

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Multilayered and Chemiresistive Thin and Thick Film Gas Sensors for Air Quality Monitoring

Bhowmick¹,

Ambardekar²,

Ghosh³

et al. 2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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Selective detection of gases such as nitrogen dioxide (NO 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ), and various volatile organic components (VOCs) is necessary for air quality monitoring. Detection of hydrogen (H 2 ) is equally important as it is a flammable gas and poses serious threat of explosion when exposed to oxygen gas. We have studied the sensing characteristics of these gases using thin film deposited by chemical solution deposition as well as relatively thicker films deposited by atmospheric plasma spray (APS) process. The chapter starts with the sensing mechanism of chemiresistive sensors followed by the definition of gas sensing parameters. Subsequently, we have demonstrated selective NO 2 sensing characteristics of zinc oxide-graphene (ZnO-G) multilayered thin film followed by CO and H 2 sensing characteristics of ZnO thin film and SnO 2 thick film. Cross-sensitivity among CO and H 2 gases has been addressed through the analysis of conductance transients with the determination of activation energy, E a , and heat of adsorption, Q. The concepts of reversible and irreversible sensing have also been discussed in relation to CO and H 2 gases. CO 2 sensing characteristics of LaFe 0.8 Co 0.2 O 3 (LFCO)-ZnO thin film have been elucidated. Interference from CO has been addressed with principal component analyses and the ascertaining of E a and Q values. Additionally, the variation of response with temperature for each gas was simulated to determine distinct parameters for the individual gases. Further, VOC sensing characteristics of copper oxide (CuO) thin film and WO 3 -SnO 2 thick film were investigated. Principal component analysis was performed to discriminate the gases in CuO thin film. The interaction of WO 3 -SnO 2 thick film with various VOCs was found to obey the Freundlich adsorption isotherm based on which E a and Q values were determined.Keywords: air quality monitoring, gas sensing, thin film sensor, thick film sensor, Langmuir adsorption isotherm, Freundlich adsorption isotherm, reversible sensing, irreversible sensing Salient features of semiconducting oxide gas sensorSemiconducting metal oxide (SMO) sensors are attractive for lower cost, smaller size, simpler operation principle, durability, and ease of fabrication together with their low concentration of gas detection limit [9]. These sensors change their conductivity when exposed to test gases of different concentrations [9]. However, the sensor operating temperature ($300°C) needs to be lowered, and cross-sensitivity toward multiple gases needs to be minimized for its wide commercial adaptation. The operating principle and salient features of SMO-based chemiresistive sensors are briefly described as follows:3 Multilayered and Chemiresistive Thin and Thick Film Gas Sensors for Air Quality Monitoring DOI: http://dx.doi.org/10.5772/intechopen.89710

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High‐Temperature Gas Sensors for Harsh Environment Applications: A Review

Ghosh

Zhang

Hai-feng

2019

CLEAN Soil Air Water

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This review paper introduces various types of gas sensors operating at high temperatures and their mechanisms, which can provide solutions to gas sensor selection for harsh environment application. Most of the gas sensors are found to be functioning at moderate operating temperatures (<400°C) and only a few reports are available, which highlight gas-sensing performance above 400°C. Therefore, the selection of a more reliable high-temperature gas sensor is necessary and advantageous for applications in areas such as agricultural waste processes (such as pyrolysis processes), military facilities, nuclear power plants, and automobile industries. In this paper, three major parts have been conducted to address the importance of high-temperature gas sensors and provide strategical solution for gas sensor selection. First, we have highlighted the application scenario and the sensing mechanism of various gas sensors operating at high temperature. Additionally, factors that affect sensing performance at moderate operating temperature have been investigated. Secondly, we have discussed the effect of material compositions, morphology of the nanostructures, and the use of dopants on sensing performance of high temperature gas sensors. Meanwhile, the catalytic nature of the sensing layer and temperature effect on chemisorption in oxide-based sensors have been discussed meticulously. Lastly, future challenges including factors affecting various sensor performance, selection, and preparation of sensing materials operating at higher temperatures are explored systematically.

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Volatile organic compound sensing using copper oxide thin films: Addressing the cross sensitivity issue

Cited by 62 publications

References 48 publications

Decoration of Nanofibrous Paper Chemiresistors with Dendronized Nanoparticles toward Structurally Tunable Negative‐Going Response Characteristics to Human Breathing and Sweating

Decoration of Nanofibrous Paper Chemiresistors with Dendronized Nanoparticles toward Structurally Tunable Negative‐Going Response Characteristics to Human Breathing and Sweating

Multilayered and Chemiresistive Thin and Thick Film Gas Sensors for Air Quality Monitoring

High‐Temperature Gas Sensors for Harsh Environment Applications: A Review

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