Highly Sensitive, Room Temperature Methane Gas Sensor Based on Lead Sulfide Colloidal Nanocrystals

Mosahebfard, Ali; Jahromi, Hamed Dehdashti; Sheikhi, Mohammad Hossein

doi:10.1109/jsen.2016.2546966

Cited by 40 publications

(17 citation statements)

References 45 publications

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“…The device operated at room temperature with a linear response in the 0.5–50 ppm NO 2 concentration range and a theoretical detection limit of 84 ppb 20 . Depending on the specific surface chemistry, PbS QDs have been employed also for detection of other gases, such as H 2 S 21 , 22 , CH 4 23 , 24 and NH 3 25 .…”

Section: Introductionmentioning

confidence: 99%

Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors

Mitri

Iacovo

Luca

et al. 2020

Sci Rep

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colloidal quantum dots (cQDs) have been recently investigated as promising building blocks for low-cost and high-performance gas sensors due to their large effective surface-to-volume ratio and their suitability for versatile functionalization through surface chemistry. in this work we report on lead sulphide cQDs based sensors for room temperature no 2 detection. the sensor response has been measured for different pollutant gases including NO 2 , cH 4 , co and co 2 and for different concentrations in the 2.8-100 ppm range. For the first time, the influence of the QDs film thickness on the sensor response has been investigated and optimized. Upon 30 ppm NO 2 release, the best room temperature gas response is about 14 Ω/Ω, with response and recovery time of 12 s and 26 min, respectively. A detection limit of about 0.15 ppb was estimated from the slope of the sensor response and its electric noise. the gas sensors exhibit high sensitivity to no 2 , remarkable selectivity, repeatability and full recovery after exposure. Nitrogen dioxide (NO 2) is an important air pollutant since it contributes to the formation of the photochemical smog, the acid rains and it is also central to the formation of fine particles (PM) as well as affecting tropospheric ozone 1,2. Besides natural sources (volcanoes, oceans, biological decay, forest fires), a significant amount of NO 2 results from human activities such as combustion of fossil fuels welding, explosives, refining of petrol and metals, commercial manufacturing, and food manufacturing 3. These activities can generate high local concentration of NO 2 that produces significant impacts on human health, especially breathing problems since NO 2 inflames the lining of the lungs thus reducing immunity to lung infections 4,5. Therefore, reliable detection of NO 2 , even at low concentration, is critical in many different sectors such as industrial plants, indoor and outdoor air quality assurance, automotive and so on, and it is an enabling technology for automatic systems capable of taking necessary measures to reduce unsafe concentrations through ventilation, filtering or catalytic breakdown 6. At present, accurate measurement of air quality is possible only by means of large monitoring equipment or laboratory instruments, unsuitable for pervasive monitoring purposes. Alternative low-cost, small-size, ultralow-power gas sensor platforms have been developed during the last two decades, mainly in the form of components for experimental sensor networks, with promising superior performance in terms of sensitivity, selectivity, minimal drift, fast time response, compactness and low energy consumption 7,8. In particular, systems that meet the following characteristics would be of great interest: miniaturization and compatibility with the development of sensor arrays integration with temperature and humidity sensors, simple production techniques and process transferability towards innovative printing techniques. Today, commercially available gas sensors are mainly based on nanostructured me...

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Section: Introductionmentioning

confidence: 99%

Lead sulphide colloidal quantum dots for room temperature NO2 gas sensors

Mitri

Iacovo

Luca

et al. 2020

Sci Rep

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“…Development of efficient devices to sense methane gas (CH 4 ), with wide industrial applications, has been a challenging task for the past several decades. − Interest in this task has much grown with the advances in the petrochemical industry, still being an active area of research. ,, Recent studies, moreover, point to the fact that methane gas in the environment has reached an unacceptable level. , Along these lines, we may also mention recent uses of CH 4 , of specific doses, in medical diagnosis. , To this end, design of practical methane gas sensors of low production cost, which readily operate at low temperatures, is most desirable. Moreover, the sensor has to be of high sensitivity and miniature sizes.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the sensor has to be of high sensitivity and miniature sizes. Owing to the fact that the current CH 4 sensors suffer from low sensitivity, , high power consumption, , high cost, etc., ,− research on novel materials for compensating such shortcomings is of much interest. It is worth mentioning that the presently available inexpensive metal-oxide-based CH 4 sensors commonly operate at relatively high temperature and thus consume considerable power. , As in the present state of fabrication of graphene, a carbon single sheet of honeycomb structure has made this material commercially available, in the present article, we take advantage of the properties of graphene, when decorated by silver nanoparticles, to propose a novel methane gas sensor.…”

Section: Introductionmentioning

confidence: 99%

Graphene Decorated with Silver Nanoparticles as a Low-Temperature Methane Gas Sensor

Ghanbari¹,

Safaiee²,

Sheikhi³

et al. 2019

ACS Appl. Mater. Interfaces

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This paper is devoted to an investigation on the methane sensing properties of graphene (G), decorated with silver nanoparticles (AgNPs), under ambient conditions. To do so, we first present an effective modification in the standard manner of decorating graphene by AgNPs. From structural analysis of the product (AgNPs/G), it is concluded that graphene is indeed decorated by AgNPs of a mean size 29.3 nm, free of aggregation, with a uniform distribution. The so-produced material is then used, as a resistivity-based sensor, to examine its response to the presence of methane gas. Our measurements are performed at relatively low temperatures, for various silver-to-graphene mass ratios (SGMRs) and methane concentrations. To account for the effects of humidity, we have made the measurements, at room temperature, for different levels of humidity. Our results demonstrate that an increase in the SGMR enhances the response of AgNPs/G to methane with an optimum value of SGMR ≅ 12%. It is also illustrated that for methane concentrations less than 2000 ppm, the maximal response increases linearly and rapidly, even at room temperature. Moreover, we demonstrate that AgNPs/G is of low limit of detection, highly stable, selective, reversible, repeatable, and sensor-to-sensor reproducible, for methane sensing. The results thus promise a low-cost and simple-to-fabricate methane sensing device.

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“…6 (with further details in Tables S1 and S2, ESI †) and found that this device is highly competitive, with better or comparable performance with existing technology in terms of experimental limits of detection, response and recovery time, sensitivity, and operating temperature. [35][36][37][38][39][40][41][42][43][44][45][46]…”

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confidence: 99%