A PdPt decorated SnO -rGO nanohybrid for high-performance resistive sensing of methane

Navazani, Shiva; Shokuhfar, Ali; Hassanisadi, Mostafa; Carlo, Aldo Di; Nia, Narges Yaghoobi; Agresti, Antonio

doi:10.1016/j.jtice.2018.08.019

Cited by 25 publications

(27 citation statements)

References 88 publications

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“…Based on the previous characterizations, to know the effect of adsorbed oxygen and Zn doping, samples P and S6 were used for gas sensing investigation as other samples doped at lower concentration did not show significant changes in structural and electronic properties. All gas sensing measurements were performed at the optimum temperature of 150 • C [47][48][49][50]. Figure 10b shows the sensor response curves recorded for samples P and S6 towards 10 ppm NO 2 at an operating temperature of 150 • C. Sensor films were exposed with NO 2 gas for 10 sec in an airtight gas chamber, and the chamber was opened for recovery, as shown by the arrows in Figure 10, as gas in and gas out, respectively.…”

Section: Gas Sensing Studiesmentioning

confidence: 99%

Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties

Goyal

Rajan

et al. 2020

Crystals

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Monodispersed CuO octahedral crystals were successfully synthesized using a low-temperature co-precipitation method. Zinc doping in CuO created surface defects that enhanced oxygen adsorption on the surface crucial for gas sensing applications. Pure and Zn-doped CuO sensor films were realized using the doctor blade method. The sensor films showed selective response towards a low concentration of NO2 at a lower operating temperature of 150 °C. Doping with Zn causes the resistance of the sensor film to decrease due to the enhancement of charge carriers with an analogous improvement in the sensor response. The observed decrease in sensor resistance agreed well with the findings of the work function studies. Zinc doping resulted in an increase in work function by 180 meV which, after NO2 exposure, was found to increase by a further 130 meV, attributed to the oxidizing behavior of the test gas.

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Section: Gas Sensing Studiesmentioning

confidence: 99%

Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties

Goyal

Rajan

et al. 2020

Crystals

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“…Improvement of the binary oxide nanomaterials to reach a high sensitivity and precise limitation can be achieved by controlling their growth and the thermal stability of these nanomaterials. Up to date, SnO 2 has the attention of the researchers for gas sensing applications [1][2][3][4]. In some studies, the sensitivity realized toward the gas by using multielement composites can be achieved if the material size is well controlled.…”

Section: Introductionmentioning

confidence: 99%

“…They are multifaceted in the operating procedures and not convenient for on-site use. Several research papers studied the oxide materials for methane detection [1][2][3][4][7][8][9][10][11][12][13][14][15][16][17][18], but most of these materials show a low sensitivity toward methane at high operating temperatures. To our best knowledge, there is no theoretical approach proved the sensing mechanism of methane by oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Development of numerical analysis and methane sensing application of highly sensitive quantum crystals based on tin dioxide prepared by hydrothermal

Shaalan

Hamad

Alshoaibi

et al. 2019

J Mater Sci: Mater Electron

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The quantum size of materials is an effective property for specific physical applications. The theoretical approach helps in understanding the physical properties of these materials. SnO 2 quantum crystals of ~ 1.8-6.0 nm are prepared by a hydrothermal method. The size of crystals is smaller than the Debye length reported for SnO 2 at 250 °C. The emission spectra of the radiative recombination between conduction and valence bands show a blue shift, which confirms the electron confinement. The prepared materials are used for fabricating gas sensor tested for CH 4 gas. The gas detecting measurements exhibited high sensitive quantum crystals, QCs, toward CH 4. For the first time, a theoretical approach is formulated for the response of SnO 2 toward CH 4 to understand the sensing mechanism of the quantum crystals. The correlation between the theoretical and experimental results clarified the reason of the high response observed for the quantum crystals toward CH 4. To conduct a high response, the crystal size should be comparable or less than the Debye length, which means that the crystal is fully depleted or in volume-depleted in the air. Thus, the high response obtained here is explained in terms of the proposed theoritical approach.

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“…Another approach was based on the use of metal oxides and transition metals, such as ZnO [38], In 2 O 3 [39], SnO 2 [40], ZnS, CdS and CdSe [41,42], and [SiW 11 O 39 ] −8 polyoxometalate [27] as suitable alternative ETLs to TiO 2 . While the use of ZnO (with a PCE of 19%) has severely restricted its development because of thermal instability [43], SnO 2 appears to be a promising choice [44].SnO 2 has high conductivity and electron mobility higher than that of TiO 2 by two orders of magnitude, appropriate energy levels (a wide bandgap ranging from 3.6 to 4.1eV, which reduces the parasitic absorption caused by the ETL), high chemical/photo-stability and UV resistance [41][42][43][44][45], leading to its use as a semiconductor in various applications [46][47][48].In this work, we present a hysteresis-free, high-efficiency planar PSC based on SnO 2 as the ETL and a P3HT/CuSCN bilayer as the HTL. CuSCN played a key role in improving the PCE of the perovskite solar cell due to its excellent transparency in the visible light spectrum range [49], high hole mobility [50], relatively good chemical stability [51] and a simple preparation process [52].…”

mentioning

confidence: 99%

“…SnO 2 has high conductivity and electron mobility higher than that of TiO 2 by two orders of magnitude, appropriate energy levels (a wide bandgap ranging from 3.6 to 4.1eV, which reduces the parasitic absorption caused by the ETL), high chemical/photo-stability and UV resistance [41][42][43][44][45], leading to its use as a semiconductor in various applications [46][47][48].…”

mentioning

confidence: 99%

Polymer/Inorganic Hole Transport Layer for Low-Temperature-Processed Perovskite Solar Cells

et al. 2020

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In the search for improvements in perovskite solar cells (PSCs), several different aspects are currently being addressed, including an increase in the stability and a reduction in the hysteresis. Both are mainly achieved by improving the cell structure, employing new materials or novel cell arrangements. We introduce a hysteresis-free low-temperature planar PSC, composed of a poly(3-hexylthiophene) (P3HT)/CuSCN bilayer as a hole transport layer (HTL) and a mixed cation perovskite absorber. Proper adjustment of the precursor concentration and thickness of the HTL led to a homogeneous and dense HTL on the perovskite layer. This strategy not only eliminated the hysteresis of the photocurrent, but also permitted power conversion efficiencies exceeding 15.3%. The P3HT/CuSCN bilayer strategy markedly improved the life span and stability of the non-encapsulated PSCs under atmospheric conditions and accelerated thermal stress. The device retained more than 80% of its initial efficiency after 100 h (60% after 500 h) of continuous thermal stress under ambient conditions. The performance and durability of the PSCs employing a polymer/inorganic bilayer as the HTL are improved mainly due to restraining perovskite ions, metals, and halides migration, emphasizing the pivotal role that can be played by the interface in the perovskite-additive hole transport materials (HTM) stack.Energies 2020, 13, 2059 2 of 12 transport materials (HTMs) have been considered so far, providing different final efficiencies, such as: (i) 2,2,7,7-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (Spiro-OMeTAD) with a PCE of 22% [6]; (ii), poly(triarylamine) (PTAA) with a PCE of 20% [7]; (iii) poly(3,4ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) with a PCE of 15% [8]; and iv) P3HT with PCE reaching 19.25% [9].There are, however, several limitations in using these kinds of materials, such as excessive price, inefficient electron-blocking capability, and low chemical stability [10]. In this respect, inorganic HTLs seem to be a convincing alternative, with materials such as NiO [11], CuI [12,13] or CuSCN [14] being potential candidates.CuSCN is a p-type inorganic semiconductor with a wide bandgap (3.4-3.9eV) [15], high hole mobility, well-aligned work function [16], good thermal stability, high optical transparency and attractive mechanical properties [17,18]. The collection of the impressive physical and chemical properties, together with its low cost and commercial availability, has made CuSCN a very suitable material to be employed as an HTL. A PCE of more than 20% has been reported for PSCs with a conventional mesostructure TiO 2 ETL and CuSCN-reduced graphene oxide (rGO) HTL [19]. However, for planar n-i-p structures, using the atomic layer deposited TiO 2 ETL and CuSCN HTL, a maximum PCE of 12.7% has been achieved so far [20]. In order to improve the open-circuit voltage in CuSCN-based PSCs, various functional molecules have been introduced between the perovskite layer and copper on the surface of CH 3 NH 3 PbI 3 layers to pass...

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A PdPt decorated SnO -rGO nanohybrid for high-performance resistive sensing of methane

Cited by 25 publications

References 88 publications

Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties

Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties

Development of numerical analysis and methane sensing application of highly sensitive quantum crystals based on tin dioxide prepared by hydrothermal

Polymer/Inorganic Hole Transport Layer for Low-Temperature-Processed Perovskite Solar Cells

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