Low cost acetone sensors with selectivity over water vapor based on screen printed TiO2 nanoparticles

Deng, Lucy L.; Zhao, Cindy X.; Ma, Y.; Chen, Shangzhi; Xu, Gu

doi:10.1039/c3ay40373d

Cited by 46 publications

(11 citation statements)

References 30 publications

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“…It is notable that there is $5% change in the total resistance for 1 ppm acetone, which is better than that of other reported state-of-the-art of solid-state acetone sensors at room temperature. [49][50][51][52] The selectivity of the acetone sensor toward water molecules was also characterized, as shown in Fig. 4c.…”

Section: Acetone Sensing Properties Of a V 4 C 3 T X Based Devicementioning

confidence: 99%

A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

et al. 2020

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Section: Acetone Sensing Properties Of a V 4 C 3 T X Based Devicementioning

confidence: 99%

A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

et al. 2020

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“…Subsequent to the exposure of oxidizing gases on WO 3 nanostructures, electrons are extracted from WO 3 surface resulting in change of resistivity due to the charge transfer from WO 3 to the gaseous analyte . Such systems are proposed for detection of gases, using morphologies such as nanoplates, nanowire, and nanorods, for improved gas sensing behavior . For example, Kim et al.…”

Section: Introductionmentioning

confidence: 99%

“…[25] Such systems are proposed ford etection of gases, using morphologies such as nanoplates, nanowire, and nanorods, for improved gas sensing behavior. [26][27][28][29][30][31][32][33] For example, Kim et al analyzed acetone concentration using catalyst-loaded WO 3 nanofibers, [34] whileK oo et al used Pt/Pd decorated hollow WO 3 nanotubes, on poly(methylm ethacrylate), nanofiber templates for detection of gases. [35] Herein, we describe in situ growth of monoclinicn anoblocks of WO 3 ,d irectly deposited over fluorine-doped tin oxide (FTO) layer for enhancing total surface area suitable for analyte interaction and for charge collection by minimizing Ohmicr esistance at the interface ( Figure 1A).…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive NO_X Detection in Simulated Exhaled Air: Enhanced Sensing via Alumina Modification of In‐Situ Grown WO₃ Nanoblocks

Alam

Ansari

Banik

et al. 2019

Chemistry An Asian Journal

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Seedlessg rowth of vertically aligned nanostructures, which can induce smoother transport and minimize Ohmic contact between substrate ands emiconductor,c an be fabricated by in situ growth utilizing modified hydrothermal methods.S uch devices can be useful in designing noninvasive ultrasensitive hand-held sensors for diagnostic identification of volatile organic compounds (VOCs) in exhaled air,o ffering pain-free and easier detection of long-term diseases such as asthma. In the present work, WO 3 nanoblocks, with ah igh surfacea rea and porosity,h ave been grown directly over transparent conducting oxide to minimize Ohmic resistance,f acilitating smoother electron transfer and enhanced current response. Further modification with porous alumina (g-Al 2 O 3 ), by electrodeposition, resulted in the selective and ultrasensitive detection of NO X in simulated exhaled air.C rystal phase purity of as-fabricatedp ristine as well modified samples is validated with X-ray diffraction analysis. Morphologicala nd microstructural analyses reveal the suc-cessfuld eposition of porous alumina over the surface of WO 3 .I mproved surface area and porosity is presented by porousa luminai nt he modified WO 3 device, suggesting more active sites for the gas molecules to get adsorbed and diffuse through the pores. Oxygen vacancies, which are detrimental in the transport phenomenoni nt he presented sensors, have been studied using X-ray photoelectrons pectroscopic (XPS) analysis. Gas sensing studies have been performed by fabricating chemiresistor devices based on bare WO 3 and Al 2 O 3 -modified WO 3 .T he highers ensitivity for NO X gas in case of g-Al 2 O 3 -modified WO 3 based devices, as compared to bare WO 3 -based devices, is attributed to the better surfacea rea and charget ransportk inetics. The presented devices trategy offers crucial understanding in the design and development of non-invasive, hand-held devices for NO gas present in the human breath,w ith potential application in medicaldiagnostics.

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“…Two of the major challenges in developing breath VOC sensors are as follows: (1) a need to be highly sensitive because the concentrations of VOC biomarkers in exhaled breath are extremely low and (2) a need to be highly selective in detecting the target VOCs due to the presence of hundreds of gaseous components in breath, including water vapor [17][18][19][20]. The human sense of smell works well in the presence of water as the olfactory receptors are not sensitive to water [18].…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride-hexafluoropropylene) composite sensors for volatile organic compounds detection in breath

Daneshkhah

Shrestha

Agarwal

et al. 2015

Sensors and Actuators B: Chemical

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This paper presents three poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) composite-based sensors for detecting volatile organic compunds (VOCs) in the presence of water vapor applicable in breath based sensing.Three sensors with varying sensitivities to acetone, water, ethanol, isoprene, and 2-ethylhexyl acetate (2-EHA),representing VOCs found in breath, have been developed. A sensor fabricated by spray coating PVDF-HFP/C65 composite (Sensor-1) exhibited a 52.6% increase in resistance when exposed to acetone, while the change was less than 0.34% for water. The resistance changes for ethanol, isoprene, and 2-EHA, were 5.6%, 3%, and 0.11%, respectively. The second sensor (Sensor-2), with a two-layer design of PVDF-HFP and PVDF-HFP/C65, was fabricated by a spin coating method, which exhibited improved response times. The response times of Sensor-2 compared to Sensor-1 decreased by 52% for acetone, 92% for water, 30% for ethanol, and 61% for isoprene. In the third sensor (Sensor-3), the addition of carbon nanotube (CNT) in the composite (PVDF-HFP/C65/CNT) caused a decrease in resistance when exposed to water. This is in contrast to Sensors 1 & 2 where resistance increased for all Page 2 of 26 VOCs, and provides a higher selectivity for the system. The results from the three sensors were analyzed using principal component analysis (PCA) and it was demonstrated that the combined responses of these sensors provide a high selectivity. The sensor fabrication, testing methods, and results are presented and discussed.

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Low cost acetone sensors with selectivity over water vapor based on screen printed TiO2 nanoparticles

Cited by 46 publications

References 30 publications

A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

Ultrasensitive NO_X Detection in Simulated Exhaled Air: Enhanced Sensing via Alumina Modification of In‐Situ Grown WO₃ Nanoblocks

Poly(vinylidene fluoride-hexafluoropropylene) composite sensors for volatile organic compounds detection in breath

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Low cost acetone sensors with selectivity over water vapor based on screen printed TiO2 nanoparticles

Cited by 46 publications

References 30 publications

A high-performance trace level acetone sensor using an indispensable V4C3Tx MXene

A high-performance trace level acetone sensor using an indispensable V4C3Tx MXene

Ultrasensitive NOX Detection in Simulated Exhaled Air: Enhanced Sensing via Alumina Modification of In‐Situ Grown WO3 Nanoblocks

Poly(vinylidene fluoride-hexafluoropropylene) composite sensors for volatile organic compounds detection in breath

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A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

A high-performance trace level acetone sensor using an indispensable V₄C₃T_x MXene

Ultrasensitive NO_X Detection in Simulated Exhaled Air: Enhanced Sensing via Alumina Modification of In‐Situ Grown WO₃ Nanoblocks