Preparation and Research of a High-Performance ZnO/SnO2 Humidity Sensor

Fan, Li; P, Li; Zhang, Hongyan

doi:10.3390/s22010293

Cited by 52 publications

(25 citation statements)

References 45 publications

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“…Consequently, in accordance with the hysteresis definition in measurements and measurement device domain, the samples do not exhibit hysteresis. This fact is of major relevance once it is better than the ones found in previously published results for hysteresis behaviour [3,8,40] (see Table 2). For instance, despite low resistance in all humidity range, Fig.…”

Section: Moisture Influence On the Electrical Responsesupporting

confidence: 49%

“…For instance, despite low resistance in all humidity range, Fig. 10 Hysteresis evaluation of 90PAA sensor response to moisture for both ascending and descending RH variations: a for 10% RH; b for 90% RH; c along the entire RH tested range at 400 Hz Bi 6 S 2 O 15 -and ZnO/SnO 2 -based sensors show a significant hysteresis [3,40], indicating that other processes like physisorption and chemisorption take place.…”

Section: Moisture Influence On the Electrical Responsementioning

confidence: 99%

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Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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Humidity sensors are in high demand for many applications, such as environmental monitoring and air and food quality control. Despite many inorganic and organic materials exhibit moisture sensing properties, the electrical response of many existing sensors is not stable along the time. Polyantimonic acid (PAA) is characterized by elevated proton conductivity and by high thermal stability: consequently, it is seen as promising proton conductor for usage in humidity sensing devices. In this work, for the first time, PAA-based bulk solid membranes were produced and tested as potential materials for relative humidity (RH) detection and their moisture sensitivity was evaluated. Two different amounts of binder were used for moulding the solid sensors: the ones with 10% of binder were designated as 90PAA, while the ones with 20% were named 80PAA. The structures of the solid samples were investigated by X-ray diffraction (XRD) technique, adsorption–desorption curves via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. The electrical behaviour was examined at ambient temperature by electrical impedance spectroscopy in the entire relative humidity (RH) interval (0–100%) and in the frequency range of 40 Hz up to 60 MHz. Electrical response of the materials was correlated with the structural features of the membranes. Both 90PAA and 80PAA sensors showed total resistance 3 × 105 and 3.5 × 105 Ω at 10% RH, respectively. A linear decrease of the resistance on RH was observed in the range 30–90% RH for both sensors. The electrical response of the evaluated PAA-based sensors displays good repeatability and reproducibility: the ones with lower binder content showed higher moisture sensitivity as well as very good time stability over 1 year.

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Section: Moisture Influence On the Electrical Responsesupporting

confidence: 49%

Section: Moisture Influence On the Electrical Responsementioning

confidence: 99%

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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“…Recently, noble metals (Au/ZnO, Ag/SnO 2 ) [35,39] and carbonbased nanomaterials (GO/ZnO, SnO 2 /rGO, g-C 3 N 4 /ZnO) [40][41][42] have been incorporated into metal oxides to realize room-temperature-operated MOx-based sensors. In Table S2, recently-published metal-oxide-based humidity sensors with a low annealing temperature (<100 • C) are listed [25,26,35,[41][42][43][44]. It is noticed that, compared to composite MOx, pure MOx sensors show lower responses [26,35,[42][43][44] under a low annealing temperature.…”

Section: Introductionmentioning

confidence: 99%

SnO2-Based Ultra-Flexible Humidity/Respiratory Sensor for Analysis of Human Breath

et al. 2023

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Developing ultraflexible sensors using metal oxides is challenging due to the high-temperature annealing step in the fabrication process. Here, we demonstrate the ultraflexible relative humidity (RH) sensor on food plastic wrap by using 808 nm near-infrared (NIR) laser annealing for 1 min at a low temperature (26.2–40.8 °C). The wettability of plastic wraps coated with sol-gel solution is modulated to obtain uniform films. The surface morphology, local temperature, and electrical properties of the SnO2 resistor under NIR laser irradiation with a power of 16, 33, and 84 W/cm2 are investigated. The optimal device can detect wide-range RH from 15% to 70% with small incremental changes (0.1–2.2%). X-ray photoelectron spectroscopy reveals the relation between the surface binding condition and sensing response. Finally, the proposed sensor is attached onto the face mask to analyze the real-time human breath pattern in slow, normal, and fast modes, showing potential in wearable electronics or respiration monitoring.

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“…A range of investigation approaches, e.g., theoretical, experimental and applicative, have been applied to ceramic materials due to their wide ranging applications [ 1 , 2 , 3 , 4 , 5 ]. Magnesium spinel ferrite is a remarkable type of ceramic material due to its properties, e.g., magnetization, coercivity, remanence, permeability, drug delivery and electrical conductivity [ 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Annealing Temperature Effects on Humidity Sensor Properties for Mg0.5W0.5Fe2O4 Spinel Ferrite

Petrila

Tudorache

2022

Sensors

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The effects of annealing temperature on the structural, physical and humidity sensing properties of stoichiometric Mg0.5W0.5Fe2O4 spinel ferrite are investigated. In order to highlight the influence of sintering temperature on the structural, magnetic and electrical properties, ferrite samples were sintered for 2 h at 850 °C, 900 °C, 950 °C, 1000 °C and 1050 °C and the physical properties and humidity influence on magnesium-tungsten ferrite materials were analyzed. X-ray diffraction investigations confirmed the formation of magnesium-tungsten ferrite in the analyzed samples. SEM micrographs revealed the influence of annealing temperature on the microstructures of the samples and provided information related to their porosity and crystallite shape and size. This material, treated at different temperatures, is used as an active element in the construction of capacitive and resistive humidity sensors, whose characteristics were also investigated in order to determine the most suitable sintering temperature.

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Preparation and Research of a High-Performance ZnO/SnO2 Humidity Sensor

Cited by 52 publications

References 45 publications

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

SnO2-Based Ultra-Flexible Humidity/Respiratory Sensor for Analysis of Human Breath

Annealing Temperature Effects on Humidity Sensor Properties for Mg0.5W0.5Fe2O4 Spinel Ferrite

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