The room temperature gas sensor based on Polyaniline@flower-like WO3 nanocomposites and flexible PET substrate for NH3 detection

Li, Siqi; Lin, Pengfei; Zhao, Lin; Wang, Chong; Liu, Deye; Liu, Fangmeng; Sun, Peng; Liang, Xishuang; Liu, Fengmin; Yan, Xu; Gao, Yuan

doi:10.1016/j.snb.2017.11.081

Cited by 171 publications

(85 citation statements)

References 33 publications

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“…To date, various wearable flexible sensors have been engineered for detecting different gases, i.e., CO, NO 2 , hydrogen (H 2 ), ammonia (NH 3 ), carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S), and water vapor (humidity) [17]- [19]. They consist normally of the sensitive sensing nanomaterials that are transferred to or directly grown on different flexible substrates as sensor carriers (e.g., poly(methyl methacrylate) (PMMA) [20], poly(dimethylsiloxane) (PDMS) [21], polyimide (PI) [22], poly(ethylene naphthalate) (PEN) [23], poly(ethylene terephtha-late) (PET) [24], and cotton fabrics [25]). Among them, cotton fabrics are currently highly researched, not only because of their excellent properties (i.e., high flexibility, low cost, high moisture absorbency, good mechanical strength, good biocompatibility, and biodegradability), but also due to the fact that these substrates can be integrated as smart clothing to support the advancement of industrial revolution 4.0 [26], [27].…”

Section: Introductionmentioning

confidence: 99%

Wearable Carbon Monoxide Sensors Based on Hybrid Graphene/ZnO Nanocomposites

et al. 2020

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In this work, wearable resistive gas sensors based on hybrid graphene/zinc oxide (ZnO) nanocomposites were fabricated on a flexible cotton fabric and employed to monitor odorless and colorless carbon monoxide (CO). Dip-coating and chemical bath deposition (CBD) was used to deposit the graphene layer and grow the ZnO nanorods, respectively. The films were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-Ray diffraction (XRD) to investigate their morphological structures, elemental composition, and crystal phase, respectively. Those characterizations were also confirming the growth of ZnO nanorods on the already-deposited graphene layer on fabrics. From the gas sensor measurements at room temperature, it was revealed that these graphene/ZnO nanocomposites were highly sensitive and selective towards CO gas at low concentration down to 10 ppm. The shortest response and recovery times of the sensors were measured to be 280 s and 45 s, respectively. Moreover, in comparison to bare graphene sensors, the surface modification by ZnO nanorods could obviously enhance the sensing response by up to 40% (i.e., doubled sensitivity). These flexible hybrid sensors are therefore expected to be a promising alternative for the existing rigid CO sensors in the market by offering unique nanostructures, low-cost fabrication, high flexibility, and good sensing performances. INDEX TERMS Wearable gas sensor, carbon monoxide, graphene, zinc oxide, fabric-based sensor.

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Section: Introductionmentioning

confidence: 99%

Wearable Carbon Monoxide Sensors Based on Hybrid Graphene/ZnO Nanocomposites

et al. 2020

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“…To date, all of the reported NH 3 resistive gas sensors using undoped tungsten oxides worked only above room temperature. The room temperature detection of NH 3 was not reported unless the tungsten oxide sensor was doped with other elements [ 27 ] or formed by using the hybrid nanocomposite with other functional materials [ 38 , 39 ]. The gas sensor presented by this work shows a decent response to NH 3 target gas at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, a great effort has been made to decrease the operating temperature, especially for wearable applications. As a result, ammonia detection around 150 °C was developed [ 37 ], as well as room temperature ammonia sensors by compositing carbon nanotubes [ 38 ], or hybridizing polyaniline [ 39 ], with tungsten oxide nanocrystals. Nevertheless, either the response time or recovery time was long, up to a few minutes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases

Zhou

Feng

2020

Sensors

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We report on the different surface structures of tungsten oxides which have been synthesized using a simple post-annealing-free hot-filament CVD technique, including 0D nanoparticles (NPs), 1D nanorods (NRs), and 2D nanosheet assemblies of 3D hierarchical nanoflowers (NFs). The surface morphologies, crystalline structures, and material compositions have been characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy, respectively. The sensor performances based on the synthesized samples of various surface morphologies have been investigated, as well as the influences of operating temperature and applied bias. The sensing property depends closely on the surface morphology, and the 3D hierarchical nanoflowers-based gas sensor offers the best sensitivity and fastest response time to NH3 and CH3 gases when operated at room temperature.

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“…Besides, various metals and/or metal oxides were also introduced to further enhance the response/recovery kinetics of the sensing materials. Chemiresistor gas sensing behavior of NH 3 based on nanostructured PPY/SnO 2 [141], PPY/ZnO [142][143][144], PPY/Zn 2 SnO 4 [145], PPY/Ag-TiO 2 [146], PPY/silicon nanowires (PPY/ SNWs) [147], PANI/SnO 2 [148], PANI/ZnO [149], PANI/In 2 O 3 [150], PANI/TiO 2 [151], PANI/flower-like WO 3 [152], PANI/SnO 2 /rGO [153], PANI-TiO 2 -Au [154], and Ag-AgCl/PPY [155] has recently been studied so far. The CP/metal oxide nanocomposite thin films exhibited an outstanding response time of 2 S for NH 3 at very low concentration of 50 ppb in air with respect to methanol and ethanol vapors [156].…”

Section: Polymer-absorption Sensors (Chemiresistors)mentioning

confidence: 99%

Gas Sensors Based on Conducting Polymers

Torad¹,

Ayad²

2020

Gas Sensors

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Since the discovery of conducting polymers (CPs), their unique properties and tailor-made structures on-demand have shown in the last decade a renaissance and have been widely used in fields of chemistry and materials science. The chemical and thermal stability of CPs under ambient conditions greatly enhances their utilizations as active sensitive layers deposited either by in situ chemical or by electrochemical methodologies over electrodes and electrode arrays for fabricating gas sensor devices, to respond and/or detect particular toxic gases, volatile organic compounds (VOCs), and ions trapping at ambient temperature for environmental remediation and industrial quality control of production. Due to the extent of the literature on CPs, this chapter, after a concise introduction about the development of methods and techniques in fabricating CP nanomaterials, is focused exclusively on the recent advancements in gas sensor devices employing CPs and their nanocomposites. The key issues on nanostructured CPs in the development of state-of-the-art miniaturized sensor devices are carefully discussed. A perspective on next-generation sensor technology from a material point of view is demonstrated, as well. This chapter is expected to be comprehensive and useful to the chemical community interested in CPs-based gas sensor applications.

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The room temperature gas sensor based on Polyaniline@flower-like WO3 nanocomposites and flexible PET substrate for NH3 detection

Cited by 171 publications

References 33 publications

Wearable Carbon Monoxide Sensors Based on Hybrid Graphene/ZnO Nanocomposites

Wearable Carbon Monoxide Sensors Based on Hybrid Graphene/ZnO Nanocomposites

Effect of Tungsten Oxide Nanostructures on Sensitivity and Selectivity of Pollution Gases

Gas Sensors Based on Conducting Polymers

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