Influence of Different Aluminum Sources on the NH3 Gas-Sensing Properties of ZnO Thin Films

Özütok, Fatma; Karaduman, Irmak; Demiri, Sani; Acar, Selim

doi:10.1007/s11664-018-6099-7

Cited by 12 publications

(5 citation statements)

References 47 publications

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“…In our previous study, Al-source effect was investigated on the NH 3 gas sensing and response time parameters as showed in Figures 5-7 [34]. Alteration of surface particle type and dissolve depending on Al-source were caused by gas sensing parameters severely due to changing the energy-band gap structure, surface effective/contact area and NH 3 gas adsorption rate.…”

Section: Sem Images Of (A) Zno and Annealed Zno Films At (B) 450°c (mentioning

confidence: 99%

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Metal Oxide Gas Sensors by Nanostructures

Sarf¹

2020

Gas Sensors

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Recently, metal oxide gas sensors by nanostructures have stirred interest and have found their way in many applications due to their high sensitivity, material design compliance and high safety properties. Gas performance tests of n-type ZnO, Al-doped ZnO and ZnO/MWCNT structures toward different type gases from our previous studies have been reported. It is indicated that nanoparticle formations on the film surfaces, grain sizes, gas types and operating temperatures have a severe effect on the chemisorption/physisorption process. Low concentration detection, determination of grain size limit values and reducing operating temperature to room temperature are already obstacles on long-life sensitivity and long-term stability characters. Doping is an effective way to increase gas sensitivity with atomic surface arrangement and active gas adsorption sites, which are generated by doping atoms. However, C-based material/MO nanostructures are preferred than doped MO films with their working even at room temperature. Up to now, a lot of methods to improve the gas sensitivity has been proposed. With the help of the development of surface modification methods such as different types of doping and MO-C composite, sensitivity, which is the most important parameter of sensor performance, can also be stable as well as increasing later on.

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Section: Sem Images Of (A) Zno and Annealed Zno Films At (B) 450°c (mentioning

confidence: 99%

“…Another improvement mechanism approach at room temperature proposed by Tai et al, indicating that supporting role of MO nanoparticles layer (first Figure 7. (a) NH 3 gas response and (b) NH 3 gas recovery times of Al:ZnO films (reprinted from [34]).…”

Section: Mo/cnt Nanocompositesmentioning

confidence: 99%

Metal Oxide Gas Sensors by Nanostructures

Sarf¹

2020

Gas Sensors

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“…Consequently, research aimed at developing ammonia gas detection and monitoring technologies has increased steadily [ 11 , 12 ]. To date, metal oxide semiconductors such as SnO 2 , ZnO, TiO 2 , and In 2 O 3 have been primarily used as materials for detecting ammonia and other gases [ 13 , 14 , 15 , 16 ]. In particular, ZnO, which has a wide bandgap (approximately 3.35 eV) and excellent semiconductor properties, has been widely used in gas sensors [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Fully Printed Ammonia Gas Sensor Based on ZnO/rGO Using Ultraviolet–Ozone Treatment

Won,

Sim,

et al. 2024

Sensors

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In this study, a room-temperature ammonia gas sensor using a ZnO and reduced graphene oxide (rGO) composite is developed. The sensor fabrication involved the innovative application of reverse offset and electrostatic spray deposition (ESD) techniques to create a ZnO/rGO sensing platform. The structural and chemical characteristics of the resulting material were comprehensively analyzed using XRD, FT-IR, FESEM, EDS, and XPS, and rGO reduction was achieved via UV–ozone treatment. Electrical properties were assessed through I–V curves, demonstrating enhanced conductivity due to UV–ozone treatment and improved charge mobility from the formation of a ZnO–rGO heterojunction. Exposure to ammonia gas resulted in increased sensor responsiveness, with longer UV–ozone treatment durations yielding superior sensitivity. Furthermore, response and recovery times were measured, with the 10 min UV–ozone-treated sensor displaying optimal responsiveness. Performance evaluation revealed linear responsiveness to ammonia concentration with a high R2 value. The sensor also exhibited exceptional selectivity for ammonia compared to acetone and CO gases, making it a promising candidate for ammonia gas detection. This study shows the outstanding performance and potential applications of the ZnO/rGO-based ammonia gas sensor, promising significant contributions to the field of gas detection.

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“…Ancak bunlar pahalı yöntemlerdir ve sistemleri temin edebilmek zor olmaktadır. Kimyasal solüsyon tabanlı büyütme metotları SILAR [18], sol-jel [19], daldırma (dipcoating) [20] ve Kimyasal Banyolama Tekniği [21] vb. metotlardır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Gas Sensor Applications of Tungsten Doped ZnO Thin Films in Low Hydrogen Gas Concentration

2021

Politeknik Dergisi

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Son zamanlarda, dizel, benzin ve propan gazı gibi fosil kaynaklardan gelen enerjinin yerini alabilecek alternatif bir enerji kaynağı olarak hidrojen gazının uygulanması için çalışmalar hızla önem kazanmaya başlamıştır. Bu nedenle, hidrojen gazı, vaat edilen alternatif bir enerji kaynağı olmanın ötesine geçtiği başlıca enerji kaynaklarından biri olarak kabul edilmektedir. Ancak, hidrojen gazı patlayıcıdır ve büyük bir yangına neden olabilir. Bu gazın rengi, kokusu ve tadı olmadığından, güvenlik için minimum miktarda hidrojen gazı algılayabilen çok hassas bir gaz sensörü üretimi yapılmalıdır. Dahası, hidrojen gazı son derece hafiftir ve atmosfere kolayca yayılır. Gaz konsantrasyonu % 4'ün üzerinde olduğunda bir patlama meydana gelebilir; bu nedenle ppm ölçekli hidrojen gazı algılayabilen sensörler geliştirilmelidir. Bu çalışmada Tungten (W) katkılı ZnO ince filmler kimyasal banyolama tekniği ile %1 ve % 2 katkılı olarak büyütüldü ve Hidrojen gaz (H2) algılama özellikleri incelendi. Üretilen numunenin farklı sıcaklıklarda (30°C-160°C) ve 5 ppm-100 ppm gaz konsantrasyonu aralığında elektriksel karakterizasyonu yapıldı. Çalışma sıcaklığı 100 C olarak bulundu. Sensörler, 5 ppm H2 gaz konsantrasyonuna karşı kabul edilebilir düzeyde duyarlılık sergiledi. %1 W-katkılı ZnO ince film 100 °C çalışma sıcaklığında diğer ince filmlere kıyasla daha yüksek algılama performansı gösterdi. %1 W-katkılı ZnO ince film 5 ppm H2 gazına karşı % 28,56 duyarlılık sergilerken, %2 W-katkılı ZnO ince film % 7 duyarlılık sergilediği hesaplandı. Ölçüm sonuçları, numunelerin gaz algılama özelliklerinin katkılamaya bağlı olarak değiştiğini gösterdi.

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Influence of Different Aluminum Sources on the NH3 Gas-Sensing Properties of ZnO Thin Films

Cited by 12 publications

References 47 publications

Metal Oxide Gas Sensors by Nanostructures

Metal Oxide Gas Sensors by Nanostructures

Fabrication of a Fully Printed Ammonia Gas Sensor Based on ZnO/rGO Using Ultraviolet–Ozone Treatment

Gas Sensor Applications of Tungsten Doped ZnO Thin Films in Low Hydrogen Gas Concentration

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