Room temperature gas sensor based on tin dioxide@ polyaniline nanocomposite assembled on flexible substrate: ppb-level detection of NH3

Li, Siqi; Liu, Ao; Yang, Zijie; He, Junming; Wang, Jing; Liu, Fangmeng; Lü, Huiying; Yan, Xu; Sun, Peng; Liang, Xishuang; Gao, Yuan

doi:10.1016/j.snb.2019.126970

Cited by 80 publications

(41 citation statements)

References 48 publications

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“…The study of Gong et al also revealed that the enhanced NH 3 sensing performance of the flower-like n-ZnO decorated with p-NiO with hierarchical structure was mainly attributed to the formation of the depletion layer and the modulation of the potential barrier height at the surface of the heterojunction [ 135 ]. A similar improved sensing mechanism was also reported in the enhanced NH 3 sensing performance of the sensors based on other heterojunctions, including polyaniline/SrGe 4 O 9 nanocomposite [ 136 ], polyaniline nanograin enchased TiO 2 fibres [ 137 ], SnO 2 @polyaniline nanocomposites [ 138 ], V 2 O 5 /CuWO 4 heterojunctions [ 139 ], Fe 2 O 3 -ZnO nanocomposites [ 49 ], rGO/WO 3 nanowire nanocomposites [ 140 ], WO 3 @SnO 2 core-shell nanosheets [ 141 ], PANI-CeO 2 nanocomposite thin films [ 142 ], CuPc-loaded ZnO nanorods [ 143 ], Co 3 O 4 nanorod-decorated MoS 2 nanosheets [ 144 ], SnO 2 /NiO composite nanowebs [ 145 ], bilayer SnO 2 -WO 3 nanofilms [ 146 ], Cu 2 O nanoparticles decorated with p-type MoS 2 nanosheets [ 147 ], TiO 2 and NiO nanostructured bilayer thin films [ 148 ] and mesoporous In 2 O 3 @CuO multijunction nanofibres [ 149 ].…”

Section: Enhanced Gas Sensing Mechanisms Of the Metal Oxide Heterojunctionssupporting

confidence: 63%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Yang

Lei

et al. 2021

Nanomaterials

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The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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Section: Enhanced Gas Sensing Mechanisms Of the Metal Oxide Heterojunctionssupporting

confidence: 63%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Yang

Lei

et al. 2021

Nanomaterials

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“…Note that both experimental and theoretical LOD values of those earlier experiments are comparable with the reported values in our experiment. For the purpose of comparison, it is worth mentioning that a tin dioxide-polyaniline nanocomposite flexible sensor revealed an ability to detect low NH 3 concentrations of 10–200 ppb [ 27 ]. It is expected that improved performance can be obtained by optimizing device structure or/and introduction of catalysts.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the Printed CNT-Film-Based Electrochemical Sensor for Detection of Liquid Chemicals

Noh

Lee

et al. 2021

Sensors

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We studied electrochemical sensors using printed carbon nanotubes (CNT) film on a polyethylene telephtalate (PET) substrate. The mechanical stability of the printed CNT film (PCF) was confirmed by using bending and Scotch tape tests. In order to determine the optimum sensor structure, a resistance-type PCF sensor (R-type PCF sensor) and a comb-type PCF sensor (C-type PCF sensor) were fabricated and compared using a diluted NH3 droplet with various concentrations. The magnitude of response, response time, sensitivity, linearity, and limit of detection (LOD) were compared, and it was concluded that C-type PCF sensor has superior performance. In addition, the feasibility of PCF electrochemical sensor was investigated using 12 kinds of hazardous and noxious substances (HNS). The detection mechanism and selectivity of the PCF sensor are discussed.

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“…When the conducting polymer matrix is embedded with inorganic nanomaterials, a P-N or Schottky heterojunction is formed at the conducting polymer/inorganic interfaces, depending upon the nature of inorganic nanomaterials [11][12][13][14][15][16]. Taking it for an example, when n-type metal oxide nanostructures are introduced into the polymer matrix, a P-N heterojunction is formed at the polymer-metal oxide interfaces, accompanying with the formation of depletion region in both polymer and metal oxides [16]. The interaction of the target gas molecules and the nanocomposite film surface leads to the decrease/increase of electrons in the polymers and therefore the change in the width of the depletion region, which could narrow/widen the conductive pathway of the polymers.…”

Section: Constructing P-n or Schottky Heterojunctionsmentioning

confidence: 99%

“…A highly porous layer with large surface area, high pore volume and desired pore size could introduce more active sites and increase the gas molecule absorption. By introducing inorganic nanomaterials, the film morphology of the nanocomposite films and the gas sensing performances can be adjusted freely [13,15,[16][17][18][19][20]. The inorganic nanomaterials could be a template for the polymerization of conducting polymers, where the nanocomposite morphology could be determined by the inorganic nanomaterials and polymerization methods.…”

Section: Modulating Film Morphologymentioning

confidence: 99%

Conducting polymer-inorganic nanocomposite-based gas sensors: a review

Yan

Yang

et al. 2020

Science and Technology of Advanced Materials

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With the rapid development of conductive polymers, they have shown great potential in room-temperature chemical gas detection, as their electrical conductivity can be changed upon exposure to oxidative or reductive gas molecules at room temperature. However, due to their relatively low conductivity and high affinity toward volatile organic compounds and water molecules, they always exhibit low sensitivity, poor stability, and gas selectivity, which hinder their practical gas sensor applications. In addition, inorganic sensitive materials show totally different advantages in gas sensors, such as high sensitivity, fast response to low concentration analytes, high surface area, and versatile surface chemistry, which could complement the conducting polymers in terms of the sensing characteristics. It seems to be a win-win choice to combine inorganic sensitive materials with polymers for gas detection due to their synergistic effects, which has attracted extensive interests in gas-sensing applications. In this review, we summarize the recent development in polymer-inorganic nanocomposite based gas sensors. The roles of inorganic nanomaterials in improving the gas-sensing performances of conducting polymers are introduced and the progress of conducting polymer-inorganic nanocomposites including metal oxides, metal, carbon (carbon nanotube, graphene), and ternary composites are presented. Finally, a conclusion and a perspective in the field of gas sensors incorporating conducting polymer-inorganic nanocomposite are summarized.

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Room temperature gas sensor based on tin dioxide@ polyaniline nanocomposite assembled on flexible substrate: ppb-level detection of NH3

Cited by 80 publications

References 48 publications

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Investigation on the Printed CNT-Film-Based Electrochemical Sensor for Detection of Liquid Chemicals

Conducting polymer-inorganic nanocomposite-based gas sensors: a review

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