Fabrication of ZnO@ZIF-8 gas sensors for selective gas detection

Khudiar, Ausama I.; Elttayef, Abdulhussein K.; Khalaf, Mohammed K.; Oufi, Attarid Mutar

doi:10.1088/2053-1591/ab69c2

Cited by 36 publications

(25 citation statements)

References 35 publications

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“…Sensitivity, selectivity, stability, and speed of response are important criteria for evaluation of sensor performance. It is one of the most challenging research directions to improve the selectivity of sensors [19,20]. Common methods to improve the selectivity of MOS gas sensors include doping [21][22][23], microstructure control [24] and surface modification [25].…”

Section: Introductionmentioning

confidence: 99%

“…Because of the strong adsorption capacity for gas, MOFs have been developed and applied in QCM sensors as sensor materials [10], and MOF sensors such as ZIF-8, ZIF-90 and HKUST-1 have a good stable response to acetone, CO 2 , hydrogen, etc., [36][37][38]. MOFs are also widely used in semiconductor gas sensors [20,39,40]. Zhou et al successfully synthesized a core-shell structure of ZnO@ZIF-8 nanorod arrays using template method.…”

Section: Introductionmentioning

confidence: 99%

“…Ausama I Khudiar et al used a similar method to coat ZIF-8 on the surface of ZnO nanorods to fabricate a gas sensor. In the test of H 2 and C 6 H 6 , it was found that the selectivity of ZnO@ZIF-8 sensor to H 2 has been significantly improved as compared with traditional sensors [20]. Wu et al synthesized ZnO@ZIF-8 nanorods with core-shell structure by solution deposition method.…”

Section: Introductionmentioning

confidence: 99%

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ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H2

Zhang

Wang

et al. 2021

Sensors

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As the energy crisis becomes worse, hydrogen as a clean energy source is more and more widely used in industrial production and people’s daily life. However, there are hidden dangers in hydrogen storage and transportation, because of its flammable and explosive features. Gas detection is the key to solving this problem. High quality sensors with more practical and commercial value must be able to accurately detect target gases in the environment. Emerging porous metal-organic framework (MOF) materials can effectively improve the selectivity of sensors as a result of high surface area and coordinated pore structure. The application of MOFs for surface modification to improve the selectivity and sensitivity of metal oxides sensors to hydrogen has been widely investigated. However, the influence of MOF modified film thickness on the selectivity of hydrogen sensors is seldom studied. Moreover, the mechanism of the selectivity improvement of the sensors with MOF modified film is still unclear. In this paper, we prepared nano-sized ZnO particles by a homogeneous precipitation method. ZnO nanoparticle (NP) gas sensors were prepared by screen printing technology. Then a dense ZIF-8 film was grown on the surface of the gas sensor by hydrothermal synthesis. The morphology, the composition of the elements and the characters of the product were analyzed by X-ray diffraction analysis (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Brunauer-Emmett-Teller (BET) and differential scanning calorimetry (DSC). It is found that the ZIF-8 film grown for 4 h cannot form a dense core-shell structure. The thickness of ZIF-8 reaches 130 nm at 20 h. Through the detection and analysis of hydrogen (1000 ppm), ethanol (100 ppm) and acetone (50 ppm) from 150 °C to 290 °C, it is found that the response of the ZnO@ZIF-8 sensors to hydrogen has been significantly improved, while the response to ethanol and acetone was decreased. By comparing the change of the response coefficient, when the thickness of ZIF-8 is 130 nm, the gas sensor has a significantly improved selectivity to hydrogen at 230 °C. The continuous increase of the thickness tends to inhibit selectivity. The mechanism of selectivity improvement of the sensors with different thickness of the ZIF-8 films is discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H2

Zhang

Wang

et al. 2021

Sensors

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“…Nevertheless, many MOFs have relatively low conductivity, meaning that single MOF materials cannot directly apply for resistive sensing applications [38]. Therefore, combining the advantages and disadvantages of SMOx and MOFs in sensing performance, composite structures of SMOx and MOFs are designed, and a sensor with excellent performance is developed by using the sensing characteristics of SMOx and the molecular sieve effect of MOF, which is extremely attractive [87].…”

Section: Mofs-semiconducting Metal Oxides Composites 21 Sensing Mechanism Of Smox and Limitationsmentioning

confidence: 99%

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

Huang

Zeng

2021

Chemosensors

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Gas sensing materials, such as semiconducting metal oxides (SMOx), carbon-based materials, and polymers have been studied in recent years. Among of them, SMOx-based gas sensors have higher operating temperatures; sensors crafted from carbon-based materials have poor selectivity for gases and longer response times; and polymer gas sensors have poor stability and selectivity, so it is necessary to develop high-performance gas sensors. As a porous material constructed from inorganic nodes and multidentate organic bridging linkers, the metal-organic framework (MOF) shows viable applications in gas sensors due to its inherent large specific surface area and high porosity. Thus, compounding sensor materials with MOFs can create a synergistic effect. Many studies have been conducted on composite MOFs with three materials to control the synergistic effects to improve gas sensing performance. Therefore, this review summarizes the application of MOFs in sensor materials and emphasizes the synthesis progress of MOF composites. The challenges and development prospects of MOF-based composites are also discussed.

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“…The authors showed that it was possible to tune the selectivity of the sensors by using post-synthesis modification of the MOF 405 . To overcome their weak electrical properties, MOFs can be used alongside electrically active materials such as conductive polymer, nanocarbon such as graphene or carbon nanotubes, metallic nanoparticles or metal oxides materials 389,397,[415][416][417][418][419] . For instance, it has been shown that MOF/graphene composites present several enhanced properties such as synergetic electrochemical and conductivity properties, better MOF dispersion and a positive impact on the porous structure [420][421][422] .…”

Section: Due To Mof Promising Gas Sensing and Adsorption Properties There Is A High-volume Scientific Production On The Subject So Only Gmentioning

confidence: 99%

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In the second half of the 20th century, post-war Europe saw major economic growth due to national reconstructions associated with high employment, industrial mass production and demographic boom. As a consequence, generalised globalisation raised an intensified international flux of goods, services and information. Advancing technology and ever-increasing worldwide goods consumption has led to the age of plastics. Their relatively easy processability and strong physico-chemical properties such as optical, mechanical or barrier properties make them the perfect candidate for many applications in building and construction, automotive, agriculture, electronics, household leisure and sports, appliances, medical furniture and packaging. In 2018, the production of plastic in Europe reached 64.4 million tons and the packaging sector represents the largest sector demands1. The market value of the packaging sector was valued at high as 917 billion US dollar in 2019 and is still rising at an annual growth of 2.8%2.In the packaging industry, the largest part concerns food packaging3 and the overall increasing number and movement of food products however also causes an increasing amount of worldwide food waste. Around one third of the globally produced food is wasted according to the estimations of the Food and Agriculture Organization (FAO) of the United Nations4. This represents 1.2 billion tons per year which seems outrageous as the FAO also estimated in 2018 that around 800 million people were chronically undernourished in the world. Food waste is a important challenge for mankind as the world population is expected to reach 10 billion people in 2050 and feeding all of them is a great challenge.

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Fabrication of ZnO@ZIF-8 gas sensors for selective gas detection

Cited by 36 publications

References 35 publications

ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H2

ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H2

Application of Metal-Organic Framework-Based Composites for Gas Sensing and Effects of Synthesis Strategies on Gas-Sensitive Performance

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