The enhancement of humidity sensing performance based on Eu-doped ZnO

Yu, Shuguo; Zhang, Hong Yan; Lin, Cunchong; Bian, Mingjin

doi:10.1016/j.cap.2018.11.015

Cited by 36 publications

(8 citation statements)

References 38 publications

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“…It can be observed that the response of the ZnO-2 sensor was consistent in three adsorption and desorption cycles, indicating that the ZnO-2 humidity sensor had good repeatability. It is well known that the time taken for a sensor to reach 90% of the total impedance change is defined as the response or recovery time [29]. The response/recovery time of the ZnO-2 humidity sensor was 31/14 s. The ZnO-2 sensor had small hysteresis and a fast response/recovery time, mainly because of the large amount of hydrophilic functional groups (OH − ), large specific surface area, and rich oxygen vacancies on the surface of it, which enhance the electrolysis and conduction processes.…”

Section: Resultsmentioning

confidence: 99%

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Zhang

et al. 2019

Sensors

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In this paper, we prepared a high-performance zinc oxide (ZnO) humidity sensor in an alkaline environment using one-step hydrothermal method. Experiments showed that the pH value of the precursor solution affects the performance of ZnO humidity sensors. There are abundant hydroxyl group and oxygen vacancies on the surface of ZnO with a precursor pH value of 10. Abundant hydroxyl groups on the surface of ZnO can adsorb a large number of water molecules and rich oxygen vacancies can accelerate the decomposition of water molecules, thus increasing the number of conductive ions (H3O+) and further improving the performance of the sensor. So, such a ZnO humidity sensor exhibited high sensitivity (14,415), good linearity, small hysteresis (0.9%), fast response/recovery time (31/15 s) in the range from 11% to 95% relative humidity (RH). Moreover, the ZnO-2 humidity sensor has good repeatability and can be effectively used for a long time. This study provides a new idea for the development of low-cost, high-performance and reusable ZnO resistive humidity sensors.

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Section: Resultsmentioning

confidence: 99%

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Zhang

et al. 2019

Sensors

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Section: Introductionmentioning

confidence: 99%

“…The use of different dopant elements and/or different dopant concentrations is one of the effective ways to change the structural, electrical and chemical character of ZnO [35]. In this way, it is also possible to eliminate or at least improve situations that may affect the humidity sensing performance such as long response and recovery times, low sensitivity and high hysteresis in the humidity sensors to be produced [9,[35][36][37]. The studies in the literature show that elements with very different properties such as aluminum (Al), indium (In), fluorine (F), magnesium (Mg) and strontium (Sr) are used as doping elements to increase the humidity sensing performance in humidity sensor applications based on ZnO [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Algün,

Alshater,

Akçay

2024

Phys. Scr.

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This study details the production and analysis of undoped zinc oxide (uZnO) and boron (B) doped zinc oxide nanostructured thin films, with a specific focus on assessing the influence of varying B doping concentrations on humidity sensing performance. The synthesis of undoped ZnO and B doped ZnO nanoparticles was carried out using sol-gel method. B doping concentrations within the ZnO lattice were adjusted to 1, 3, 4, 5, and 10 mol%. Subsequently, nanostructured thin films were obtained through the spin coating technique on glass substrates. X-ray diffraction analysis revealed a hexagonal wurtzite structure for all nanostructured thin films. Notably, a change in preferential orientation from the (002) plane to the (100) plane occurred when B doping concentration exceeded 5 mol%. Scanning electron microscopy showcased nano-sized grains and capillary nanopores on the surface of each thin film. Energy dispersive X-ray spectra confirmed the presence of zinc, oxygen, and boron elements in the nanostructured thin films. Humidity sensing performance was assessed through electrical resistance measurements in the range of 45–90% relative humidity at room temperature. All fabricated sensors exhibited sensitivity to humidity. Remarkably, the sensor with a 5 mol% B doping concentration demonstrated the highest humidity sensitivity (438.44 times) and the fastest response (2.0 s) and recovery times (14.2 s). The study concluded that the optimal B doping concentration for designing a highly efficient humidity sensor was determined to be 5 mol%. Overall, the study underscores the potential of B doped ZnO nanostructures for humidity sensor applications, given their exceptional sensor performance.

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“…Shen et al [25] fabricated Ce-doped ZnO nanowires for sensing ethanol. Zhang et al [26] fabricated a humidity sensor that was made of Eu-doped ZnO using the sol-gel method. Most literatures tend to explore the effects of rare earth ions and oxides doping on the enhancing gas-sensing properties.…”

Section: Introductionmentioning

confidence: 99%

Electrical and Humidity-Sensing Properties of EuCl2, Eu2O3 and EuCl2/Eu2O3 Blend Films

Choy

2021

Chemosensors

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Impedance-type humidity sensors based on EuCl2, Eu2O3 and EuCl2/Eu2O3 blend films were fabricated. The electrical properties of the pure EuCl2 and Eu2O3 films and EuCl2/Eu2O3 blend film that was blended with different amounts of EuCl2 were investigated as functions of relative humidity. The influences of the EuCl2 to the humidity-sensing properties (sensitivity and linearity) of the EuCl2/Eu2O3 blend film were thus elucidated. The impedance-type humidity sensor that was made of a 7 wt% EuCl2/Eu2O3 blend film exhibited the highest sensitivity, best linearity, a small hysteresis, a fast response time, a small temperature coefficient and long-term stability. The complex impedance plots were used to elucidate the role of ions in the humidity-sensing behavior of the EuCl2/Eu2O3 blend film.

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The enhancement of humidity sensing performance based on Eu-doped ZnO

Cited by 36 publications

References 38 publications

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Effects of pH on High-Performance ZnO Resistive Humidity Sensors Using One-Step Synthesis

Improved humidity sensing performances of boron doped ZnO nanostructured thin films depending on boron concentration

Electrical and Humidity-Sensing Properties of EuCl2, Eu2O3 and EuCl2/Eu2O3 Blend Films

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