Particle size effects on the hydrogen sensing properties of Pd/ZnO Schottky contacts fabricated by sol–gel method

Yadav, Aniruddh Bahadur; Jit, Satyabrata

doi:10.1016/j.ijhydene.2016.08.201

Cited by 30 publications

(11 citation statements)

References 42 publications

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“…Yadav et al [ 20 ] obtained ZnO films by combining sol-gel and spin coating methods, under different synthesis conditions. They analyzed the different morphologies obtained due to the variation of the synthesis conditions and they found that the morphology of the sensitive material of hydrogen sensors has a great influence on their performance.…”

Section: Synthesis Methodsmentioning

confidence: 99%

“…In addition, high hydrogen concentrations lead to a decrease in the amount of oxygen and consequently to suffocation, neuronal apoptosis and other neuronal disorders [ 2 , 16 , 17 ]. Because hydrogen cannot be detected directly by the human senses by odor or color, and due to its small atomic radius [ 18 , 19 ], it is necessary to perform this detection by means of specialized sensors [ 3 , 4 , 19 , 20 ]. With regard to the lack of color and odor of hydrogen, current studies aim to attribute these characteristics to it [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis Methods of Obtaining Materials for Hydrogen Sensors

Constantinoiu

Viespe

2021

Sensors

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The development of hydrogen sensors has acquired a great interest from researchers for safety in fields such as chemical industry, metallurgy, pharmaceutics or power generation, as well as due to hydrogen’s introduction as fuel in vehicles. Several types of sensors have been developed for hydrogen detection, including resistive, surface acoustic wave, optical or conductometric sensors. The properties of the material of the sensitive area of the sensor are of great importance for establishing its performance. Besides the nature of the material, an important role for its final properties is played by the synthesis method used and the parameters used during the synthesis. The present paper highlights recent results in the field of hydrogen detection, obtained using four of the well-known synthesis and deposition methods: sol-gel, co-precipitation, spin-coating and pulsed laser deposition (PLD). Sensors with very good results have been achieved by these methods, which gives an encouraging perspective for their use in obtaining commercial hydrogen sensors and their application in common areas for society.

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Section: Synthesis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis Methods of Obtaining Materials for Hydrogen Sensors

Constantinoiu

Viespe

2021

Sensors

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“…In addition, modification of the MOS with other materials can also enhance the selectivity of the sensor. For example, one can realize the selective detection of H 2 using Pd NP-decorated MOSs due to their good catalytic activity 170 . In recent years, some researchers have covered the surface of MOSs with MOFs to improve the sensor selectivity through the size-excusive effect 171 , 172 .…”

Section: Conclusion Future Outlook Remaining Challengesmentioning

confidence: 99%

Heteronanostructural metal oxide-based gas microsensors

et al. 2022

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The development of high-performance, portable and miniaturized gas sensors has aroused increasing interest in the fields of environmental monitoring, security, medical diagnosis, and agriculture. Among different detection tools, metal oxide semiconductor (MOS)-based chemiresistive gas sensors are the most popular choice in commercial applications and have the advantages of high stability, low cost, and high sensitivity. One of the most important ways to further enhance the sensor performance is to construct MOS-based nanoscale heterojunctions (heteronanostructural MOSs) from MOS nanomaterials. However, the sensing mechanism of heteronanostructural MOS-based sensors is different from that of single MOS-based gas sensors in that it is fairly complex. The performance of the sensors is influenced by various parameters, including the physical and chemical properties of the sensing materials (e.g., grain size, density of defects, and oxygen vacancies of materials), working temperatures, and device structures. This review introduces several concepts in the design of high-performance gas sensors by analyzing the sensing mechanism of heteronanostructural MOS-based sensors. In addition, the influence of the geometric device structure determined by the interconnection between the sensing materials and the working electrodes is discussed. To systematically investigate the sensing behavior of the sensor, the general sensing mechanism of three typical types of geometric device structures based on different heteronanostructural materials are introduced and discussed in this review. This review will provide guidelines for readers studying the sensing mechanism of gas sensors and designing high-performance gas sensors in the future.

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“…The height of the energy barrier for electron transport between neighbouring grains in a material is an important factor for determining the gas sensitivity of that material. From the Arrhenius equation, the conductivity of metal oxides can be described as follows [33]:…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

“…where R 0 is a factor that includes the bulk intragranular resistance, k is the Boltzmann's constant, T is the absolute temperature, and e • V s is the potential energy barrier at the interface between two neighbouring particles. Also, the mathematical potential energy barrier between two neighbouring grains in semiconducting metal oxide can be described by the following relationship [33]: (14) where N t is the surface density of adsorbed oxygen ions, ε r •ε 0 is permittivity of metal oxide and N d is the concentration of electron donors. It is clear that both the energy barrier between two grain boundaries and the conductivity of the metal oxides are the functions of the oxygen partial pressure, temperature, and doping concentration.…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

A comparative study on the electrical and gas sensing properties of thick films prepared with synthesized nano-sized and commercial micro-sized Fe2O3 powders

Mirzaei

Bonyani

Torkian

et al. 2017

PAC

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In this work, Fe2O3 nanoparticles (NPs) were successfully synthesized by Pechini sol-gel method. Scanning electron microscopy, transmission electron microscopy and X-ray diffraction characterizations were used to study the morphology and crystal structure of the synthesized products. The electrical and gas sensing behaviour of the synthesized and commercial Fe2O3 samples, prepared in the form of thick films, were studied. Though the commercial Fe2O3 powders had lower resistance but it was found that the synthesized Fe2O3 NPs had better gas sensing properties. The underlying mechanisms are discussed in details. The present findings show advantages of Fe2O3 NPs over micro-size particles for gas sensing applications.

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Particle size effects on the hydrogen sensing properties of Pd/ZnO Schottky contacts fabricated by sol–gel method

Cited by 30 publications

References 42 publications

Synthesis Methods of Obtaining Materials for Hydrogen Sensors

Synthesis Methods of Obtaining Materials for Hydrogen Sensors

Heteronanostructural metal oxide-based gas microsensors

A comparative study on the electrical and gas sensing properties of thick films prepared with synthesized nano-sized and commercial micro-sized Fe2O3 powders

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