The opposite processes narrow the HAL thickness, and the resistance is high in p-p heterojunction. In target gases exposure (reducing gases), the ionized oxygen interacts with the gases and releases back the electron to the sensing material. Consequently, the HAL thickness reduces, and hence the resistance increases significantly.
A hydrogen gas sensor based on p-n heterojunction between Sb 2 O 3 and SnO 2 exhibited high sensitivity of 697 % for 100 ppm H 2 at 280 °C and it responded in 29.8 s and recovered in 13.4 s.
Similarly, an n-n heterojunction of MoS 2 /ZnO provides a response of 31.08 for 100 ppm of triethylamine at 200 °C at a speed of 35 s and recovery in 142 s . The surface defect of MoS 2 behaves as active sites of TEA but due to high adsorption energy, the sensitivity is low for pure MoS 2.
The research of heterojunctions pays more attention to the effects brought by the intrinsic feature of the building blocks (e. g., band structures, alignment styles, semiconductor types, carrier concentration, and Fermi level difference) on the electronic structure and electric field distribution of whole materials.
In the shades, heterojunction boosts the sensing ability of the material through electronic effects, chemical effects, and geometrical effects. A heterojunction is an interface formed between two different materials.
Heterojunction enhances the sensing ability through the collaborative effect. Mechanism of different heterojunctions of metal oxides are demonstrated. Heterojunction with heterostructure provides better sensitivity. Functionalization of metal on heterojunction efficiently varies the sensitivity.
An Internal Resistance Consistency Detection Approach for …
To accurately localize the cell with inconsistent internal resistance in the LIB pack, an improved bridging circuit is built. The simulation and experimental results indicate that the polarity and amplitude of the bridging capacitor currents could be used to detect and localize the inconsistent cell or region with an average error of 1.33%. The ...
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Resistance-driven low power H2S sensors based on MWCNT@CuO heterojunction
The heterojunction allows for the detection of extremely low levels of H 2 S at 50 °C. This finding also opens up possibilities for further research into the development of materials based on oxides and carbon.
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Theoretical investigation of high-efficiency GaN–Si …
By optimizing the doping concentration and junction depth, a high-efficiency heterojunction betavoltaic microbattery can be achieved. The maximum power is calculated as 22.90 nW/cm 2 using 1 mCi Ni 63 beta source and GaN–Si …
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An Internal Resistance Consistency Detection Approach for …
To accurately localize the cell with inconsistent internal resistance in the LIB pack, an improved bridging circuit is built. The simulation and experimental results indicate that the polarity and …
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A fast response hydrogen sensor based on the heterojunction of …
Hexagonal SnO 2 and multilayer MXene composite nanostructures were prepared by high-temperature calcination. The adsorption behavior of MXene-SnO 2 heterojunction to H 2 gas is investigated by using density functional theory. The MXene-SnO 2 sensor demonstrated fast response/recovery behavior toward hydrogen gas sensing.
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A fast response hydrogen sensor based on the heterojunction of …
The MXene-SnO 2 chemical resistance sensor has good selectivity and response values for hydrogen compared to pure SnO 2, with higher sensitivity and longer stability. The formation of MXene-SnO 2 heterojunction enhances the perception of H 2. It can introduce additional electrons on the surface of heterojunction, providing H 2 adsorbs more
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Three-Phase-Heterojunction Cu/Cu
Zn–CO 2 batteries are excellent candidates for both electrical energy output and CO 2 utilization, whereas the main challenge is to design electrocatalysts for electrocatalytic CO 2 reduction reactions with high selectivity and low cost. Herein, the three-phase heterojunction Cu-based electrocatalyst (Cu/Cu 2 O-Sb 2 O 3-15) is synthesized and evaluated for highly …
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Theoretical investigation of high-efficiency GaN–Si heterojunction ...
By optimizing the doping concentration and junction depth, a high-efficiency heterojunction betavoltaic microbattery can be achieved. The maximum power is calculated as 22.90 nW/cm 2 using 1 mCi Ni 63 beta source and GaN–Si heterojunction with junction depth of 0.1 μm and doping concentrations of N a = 4 × 10 17 cm −3 and N d = 4 × 10 16 ...
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A fast response hydrogen sensor based on the heterojunction of …
Photo-assisted Zn-air battery promoted self-powered sensor for selective and sensitive detection of antioxidant gallic acid based on Z-scheme nanoarchitectonics with …
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Battery Internal Resistance Detection Based on AC Injection Method
In this paper, a detection scheme of battery internal resistance is proposed, which measures the internal resistance of LIB through AC injection method .This method calculates the internal …
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Co-MOF-74 derived Co3O4/graphene heterojunction nanoscrolls for ppb ...
For the first time, Co-MOF-74 derived Co 3 O 4 /graphene heterojunction nanoscrolls (Co 3 O 4 /GNS) structure is synthesized by a simple one-step hydrothermal strategy and subsequent calcination process. Theoretically, the growth mechanism of Co 3 O 4 /GNS is revealed by molecular dynamic simulation, demonstrating that a high loading of Co-MOF-74 …
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A fast response hydrogen sensor based on the heterojunction of …
Hexagonal SnO 2 and multilayer MXene composite nanostructures were prepared by high-temperature calcination. The adsorption behavior of MXene-SnO 2 heterojunction to H 2 gas is investigated by using density functional theory. The MXene-SnO 2 …
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Construction of rGO-SnO2 heterojunction for enhanced hydrogen detection
Request PDF | Construction of rGO-SnO2 heterojunction for enhanced hydrogen detection | Sandwich-structured rGO-SnO2 nanocomposites comprising of reduced graphene oxide (rGO) nanosheets and SnO2 ...
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A fast response hydrogen sensor based on the heterojunction of …
Photo-assisted Zn-air battery promoted self-powered sensor for selective and sensitive detection of antioxidant gallic acid based on Z-scheme nanoarchitectonics with heterojunction AgBr/CuBi2O4
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Photoelectrochemical detection of Cu2+ based on ZnIn2S4/WO3 …
A one-step hydrothermal technique was utilized to generate WO3 nanosheets on fluorine-doped tin oxide (FTO) (WO3/FTO), which were subsequently modified with ZnIn2S4 microspheres to create a Z-scheme heterojunction ZnIn2S4/WO3/FTO electrode for Cu2+ detection. The heterojunction exhibited excellent photoelectric conversion efficiency, which …
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Band structure and mechanism of semiconductor metal oxide ...
Yu et al. formed a p-n heterojunction using CuO and ZnSnO 3 that detects ethanol at 160 °C with an output of 131 for 100 ppm concentration. The sensor is highly …
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Design of effective self-powered SnS2/halide perovskite photo-detection …
In this paper, a cost effective novel planar photodetector (PD) based on heterojunction of SnS2 sheets and Cs0.05(FA0.83 MA0.17)0.95Pb(I0.83Br0.17)3 three cationic lead iodide based perovskite ...
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Band structure and mechanism of semiconductor metal oxide ...
Yu et al. formed a p-n heterojunction using CuO and ZnSnO 3 that detects ethanol at 160 °C with an output of 131 for 100 ppm concentration. The sensor is highly selective towards ethanol compared to acetone, ammonia, toluene, and formaldehyde, and it responds rapidly in 13 s and recovers in 8 s [55] .
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5 Heterostructure Anodes for Lithium/Sodium-Ion …
The incorporation of the Co−MOF component can significantly promote the electrolyte diffusion, increase active sites, as well as accelerate the electron/ion transfer in heterojunction anodes, which greatly improves the …
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Co/CoO heterojunction rich in oxygen vacancies introduced by O
As a result, the three-dimensional NHCNBs coupled with NCNTs and unique heterojunction with rich oxygen vacancies reduce the charge transport resistance and accelerate the catalytic reaction rate of the P–Co/CoO V @NHCNB@NCNT, and they display exceedingly good electrocatalytic performance for oxygen reduction reaction (ORR, halfwave potential [E …
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Individual Cell Fault Detection for Parallel-Connected Battery Cells ...
In this paper, we consider parallel-connected battery cells with only one voltage and one current sensor. The lack of independent current sensors makes it difficult to detect individual cell …
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Individual Cell Fault Detection for Parallel-Connected Battery …
In this paper, we consider parallel-connected battery cells with only one voltage and one current sensor. The lack of independent current sensors makes it difficult to detect individual cell degradation. To this end, based on the high-frequency response of the battery, a simplified fault detection-oriented model is derived and validated by a ...
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Battery Internal Resistance Detection Based on AC Injection …
In this paper, a detection scheme of battery internal resistance is proposed, which measures the internal resistance of LIB through AC injection method .This method calculates the internal resistance value by injecting a small AC signal into the battery and then measuring the corresponding value of the voltage generated at both ends of the ...
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Recent advances in ethanol gas sensors based on metal oxide ...
In MOS sensors, fluctuations in the electrical resistance (R) are used to detect the presence of VOC gases and collect information regarding them. In n-type MOSs, resistance is increased by introducing chemisorbed oxygen species (O 2 −, O −, and O 2− ) and lowered by removing the adsorbed oxygen through reactions with reducing VOC concentrations [ 65, 66 ].
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Bismuth-based heterojunction nanocomposites for photocatalysis and ...
This heterojunction resulted in good reproducibility, accuracy, selectivity and sensitivity for detection of Cd, Hg, Pb and Zn with detection limits in range between 8 and 60 ng L −1 [194]. Carbonaceous nanomaterials such carbon nanotubes (CNTs) and carbon dots (CDs) also have been utilized in biosensing and sensing due to their low toxicity, eco-friendliness, …
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Band structure and mechanism of semiconductor metal oxide ...
Here, the band structure of heterojunction, sensing mechanism of p-n, n-n, and p-p heterojunctions are well discussed, and various heterojunction materials are demonstrated for the detection of different gases. MXene is a blooming 2D nano material in gas sensors that possesses high surface area, rich functional group, high metallic conductivity, and more active …
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5 Heterostructure Anodes for Lithium/Sodium-Ion Storage
The incorporation of the Co−MOF component can significantly promote the electrolyte diffusion, increase active sites, as well as accelerate the electron/ion transfer in heterojunction anodes, which greatly improves the electrochemical performance of lithium/sodium-ion batteries, paving a new way for the development of energy storage.
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Resistance-driven low power H2S sensors based on …
The heterojunction allows for the detection of extremely low levels of H 2 S at 50 °C. This finding also opens up possibilities for further research into the development of …
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Construction of rGO-SnO2 heterojunction for enhanced hydrogen detection …
The relationship between the sensor resistance and the GO dosage is shown in Fig. S1, and it is found that the sensor resistance decreases as the GO dosage increases from 0 to 0.6%. Such phenomenon is mainly caused by the higher electrical conductivity of rGO. When the GO dosage is higher than 0.6%, the sensor resistance increases, which may be due to the …
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A fast response hydrogen sensor based on the heterojunction of …
The MXene-SnO 2 chemical resistance sensor has good selectivity and response values for hydrogen compared to pure SnO 2, with higher sensitivity and longer …
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